Merge branch 'main' into day07-enhance

2023-12-26 13:09:01 -07:00 · 2023-12-26 13:09:01 -07:00 · c9e364af27
commit c9e364af27
parent 50f1016372 f0696a6fe6
74 changed files with 7410 additions and 246 deletions
--- a/.gitea/workflows/github-mirror.yml
+++ b/.gitea/workflows/github-mirror.yml
@ -0,0 +1,30 @@
+name: Go Bump
+
+on: 
+  push:
+    branches: [ "main" ]
+
+jobs:
+  bump:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v3
+      with:
+        fetch-depth: 0
+        fetch-tags: true
+        
+    - name: Deploy to external repository
+      uses: https://git.sour.is/actions/github-action-push-to-another-repository@main
+      env:
+        API_TOKEN_GITHUB: ${{ secrets.API_TOKEN_GITHUB }}
+      with:
+        # GitHub Action output files
+        source-directory: .
+        destination-github-username: jonlundy
+        destination-repository-name: advent-of-code
+        user-email: jon@xuu.cc
+        # It defaults to `main`
+        target-branch: "main"
+
+    - run: echo "🍏 This job's status is ${{ job.status }}."
+
--- a/.gitea/workflows/test.yml
+++ b/.gitea/workflows/test.yml
@ -0,0 +1,33 @@
+name: Go Test
+
+on:
+  push:
+    branches: [ "main" ]
+  pull_request:
+    branches: [ "main" ]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+    - run: echo "🎉 The job was automatically triggered by a ${{ gitea.event_name }} event."
+    - run: echo "🐧 This job is now running on a ${{ runner.os }} server hosted by Gitea!"
+    - run: echo "🔎 The name of your branch is ${{ gitea.ref }} and your repository is ${{ gitea.repository }}."
+    
+    - uses: actions/checkout@v3
+    - run: echo "💡 The ${{ gitea.repository }} repository has been cloned to the runner."
+    - run: echo "🖥️ The workflow is now ready to test your code on the runner."
+    
+    - name: List files in the repository
+      run: |
+        ls ${{ gitea.workspace }}
+    
+    - name: Set up Go
+      uses: actions/setup-go@v3
+      with:
+        go-version: 1.21.3
+
+    - name: Test
+      run: go test --race -cover ./...
+
+    - run: echo "🍏 This job's status is ${{ job.status }}."
--- a/README.md
+++ b/README.md
@ -0,0 +1,2 @@
+Advent of Code 2023
+----
--- a/day01/example1.txt
+++ b/day01/example1.txt
@ -0,0 +1,4 @@
+1abc2
+pqr3stu8vwx
+a1b2c3d4e5f
+treb7uchet
--- a/day01/example2.txt
+++ b/day01/example2.txt
@ -0,0 +1,7 @@
+two1nine
+eightwothree
+abcone2threexyz
+xtwone3four
+4nineeightseven2
+zoneight234
+7pqrstsixteen
--- a/day01/main.go
+++ b/day01/main.go
@ -2,25 +2,32 @@ package main

 import (
 	"bufio"
-	"bytes"
 	_ "embed"
 	"fmt"
 	"strings"
+
+	aoc "go.sour.is/advent-of-code"
 )

-//go:embed input.txt
-var input []byte
+func main() { aoc.MustResult(aoc.Runner(run)) }

-func main() {
-	buf := bytes.NewReader(input)
-	scan := bufio.NewScanner(buf)
+type result struct {
+	sum  int
+	sum2 int
+}
+
+func (r result) String() string {
+	return fmt.Sprintln("result pt1:", r.sum, "\nresult pt2:", r.sum2)
+}
+
+var numbers = []string{"zero", "one", "two", "three", "four", "five", "six", "seven", "eight", "nine"}
+
+func run(scan *bufio.Scanner) (*result, error) {
+	result := &result{}

-	sum := 0
 	for scan.Scan() {
 		var first, last int
-
-		orig := scan.Text()
-		_ = orig
+		var first2, last2 int

 		text := scan.Text()

@ -30,110 +37,66 @@ func main() {

 			switch {
 			case slice[0] >= '0' && slice[0] <= '9':
-				first = int(slice[0] - '0')
-			case strings.HasPrefix(string(slice), "one"):
-				first = 1
-			case strings.HasPrefix(string(slice), "two"):
-				first = 2
-			case strings.HasPrefix(string(slice), "three"):
-				first = 3
-			case strings.HasPrefix(string(slice), "four"):
-				first = 4
-			case strings.HasPrefix(string(slice), "five"):
-				first = 5
-			case strings.HasPrefix(string(slice), "six"):
-				first = 6
-			case strings.HasPrefix(string(slice), "seven"):
-				first = 7
-			case strings.HasPrefix(string(slice), "eight"):
-				first = 8
-			case strings.HasPrefix(string(slice), "nine"):
-				first = 9
+				if first == 0 {
+					first = int(slice[0] - '0')
+				}
+				if first2 == 0 {
+					first2 = int(slice[0] - '0')
+				}
+			default:
+				if first2 != 0 {
+					continue
+				}

+				for i, s := range numbers {
+					if strings.HasPrefix(string(slice), s) {
+						first2 = i
+						break
+					}
+				}
 			}
-			if first != 0 {
+			if first != 0 && first2 != 0 {
 				break
 			}
 		}

-		text = string(reverse([]rune(text)))
+		text = string(aoc.Reverse([]rune(text)))

 		for i := range text {
 			copy(slice, []rune(text[i:]))
-			slice = reverse(slice)
+			slice = aoc.Reverse(slice)

 			switch {
 			case slice[4] >= '0' && slice[4] <= '9':
-				last = int(slice[4] - '0')
-			case strings.HasSuffix(string(slice), "one"):
-				last = 1
-			case strings.HasSuffix(string(slice), "two"):
-				last = 2
-			case strings.HasSuffix(string(slice), "three"):
-				last = 3
-			case strings.HasSuffix(string(slice), "four"):
-				last = 4
-			case strings.HasSuffix(string(slice), "five"):
-				last = 5
-			case strings.HasSuffix(string(slice), "six"):
-				last = 6
-			case strings.HasSuffix(string(slice), "seven"):
-				last = 7
-			case strings.HasSuffix(string(slice), "eight"):
-				last = 8
-			case strings.HasSuffix(string(slice), "nine"):
-				last = 9
+				if last == 0 {
+					last = int(slice[4] - '0')
+				}
+				if last2 == 0 {
+					last2 = int(slice[4] - '0')
+				}
+			default:
+				if last2 != 0 {
+					continue
+				}
+				for i, s := range numbers {
+					if strings.HasSuffix(string(slice), s) {
+						last2 = i
+						break
+					}
+				}

 			}
-			if last != 0 {
+			if last != 0 && last2 != 0 {
 				break
 			}
 		}

-		sum += first*10 + last
+		result.sum += first*10 + last
+		result.sum2 += first2*10 + last2
 	}
 	if err := scan.Err(); err != nil {
-		panic(err)
+		return nil, err
 	}

-	fmt.Println(sum)
+	return result, nil
 }
-
-func reverse[T any](arr []T) []T{
-	for i := 0; i < len(arr)/2; i++ {
-		arr[i], arr[len(arr)-i-1] = arr[len(arr)-i-1], arr[i]
-	}
-	return arr
-}
-
-
-// type sorter[T rune | int] []T
-
-// func (s sorter[T]) Less(i, j int) bool { return s[i] < s[j] }
-// func (s sorter[T]) Len() int      { return len(s) }
-// func (s sorter[T]) Swap(i, j int) { s[i], s[j] = s[j], s[i] }
-
-/*
-0
-1
-2
-3
-4
-5
-6
-7
-8
-9
-one
-two
-three
-four
-five
-six
-seven
-eight
-nine
-ten
-
-
-*/
--- a/day01/main_test.go
+++ b/day01/main_test.go
@ -0,0 +1,54 @@
+package main
+
+import (
+	"bufio"
+	"bytes"
+	"testing"
+
+	_ "embed"
+
+	"github.com/matryer/is"
+)
+
+//go:embed example1.txt
+var example1 []byte
+
+//go:embed example2.txt
+var example2 []byte
+
+//go:embed input.txt
+var input []byte
+
+func TestExample1(t *testing.T) {
+	is := is.New(t)
+	scan := bufio.NewScanner(bytes.NewReader(example1))
+
+	result, err := run(scan)
+	is.NoErr(err)
+
+	t.Log(result)
+	is.Equal(result.sum, 142)
+}
+
+
+func TestExample2(t *testing.T) {
+	is := is.New(t)
+	scan := bufio.NewScanner(bytes.NewReader(example2))
+
+	result, err := run(scan)
+	is.NoErr(err)
+
+	t.Log(result)
+	is.Equal(result.sum2, 281)
+}
+func TestInput(t *testing.T) {
+	is := is.New(t)
+	scan := bufio.NewScanner(bytes.NewReader(input))
+
+	result, err := run(scan)
+	is.NoErr(err)
+
+	t.Log(result)
+	is.Equal(result.sum, 54573)
+	is.Equal(result.sum2, 54591)
+}
--- a/day02/main.go
+++ b/day02/main.go
@ -2,24 +2,39 @@ package main

 import (
 	"bufio"
-	"bytes"
 	_ "embed"
 	"fmt"
+	"os"
 	"strconv"
 	"strings"
+
+	aoc "go.sour.is/advent-of-code"
 )

-//go:embed input.txt
-var input []byte
+func main() {
+	result, err := aoc.Runner(run)
+	if err != nil {
+		aoc.Log("ERR", err)
+		os.Exit(1)
+	}
+
+	aoc.Log(result)
+}
+
+type result struct {
+	sum      int
+	powerSum int
+}
+
+func (r result) String() string {
+	return fmt.Sprintln("result pt1:", r.sum, "\nresult pt2:", r.powerSum)
+}

 type gameResult struct {
 	red, green, blue int
 }

-func main() {
-	buf := bytes.NewReader(input)
-	scan := bufio.NewScanner(buf)
-
+func run(scan *bufio.Scanner) (*result, error) {
 	// only 12 red cubes, 13 green cubes, and 14 blue cubes
 	maxCounts := gameResult{
 		red:   12,
@ -36,12 +51,10 @@ func main() {
 			continue
 		}

-		games = append(games, []gameResult{})
+		rounds := aoc.SliceMap(func(text string) gameResult {
+			round := gameResult{}

-		for _, round := range strings.Split(text, ";") {
-			game := gameResult{}
-
-			for _, result := range strings.Split(round, ",") {
+			for _, result := range strings.Split(text, ",") {
 				ns, color, _ := strings.Cut(strings.TrimSpace(result), " ")
 				n, err := strconv.Atoi(ns)
 				if err != nil {
@ -50,20 +63,21 @@ func main() {

 				switch color {
 				case "red":
-					game.red = n
+					round.red = n
 				case "green":
-					game.green = n
+					round.green = n
 				case "blue":
-					game.blue = n
+					round.blue = n
 				}
-
 			}
-			games[len(games)-1] = append(games[len(games)-1], game)
-		}
+			return round
+		}, strings.Split(text, ";")...)
+
+		games = append(games, rounds)
 	}

-	fmt.Println(games)
-	fmt.Println(len(games))
+	aoc.Log(games)
+	aoc.Log(len(games))

 	sum := 0
 	powerSum := 0
@ -81,24 +95,24 @@ func main() {
 			mins.blue = max(mins.blue, round.blue)

 			if maxCounts.red < round.red {
-				fmt.Println("game", i, round, "too many red", round.red)
+				aoc.Log("game", i, round, "too many red", round.red)
 				ok = false
 			} else if maxCounts.blue < round.blue {
-				fmt.Println("game", i, round, "too many blue", round.blue)
+				aoc.Log("game", i, round, "too many blue", round.blue)
 				ok = false
 			} else if maxCounts.green < round.green {
-				fmt.Println("game", i, round, "too many green", round.green)
+				aoc.Log("game", i, round, "too many green", round.green)
 				ok = false
 			}
-			fmt.Println("game", i, round, ok)
+			aoc.Log("game", i, round, ok)
 		}
 		if ok {
 			sum += i
-			fmt.Println("game", i, "passes", sum)
+			aoc.Log("game", i, "passes", sum)
 		}
-		power := mins.red*mins.blue*mins.green
-		fmt.Println("game", i, "mins", mins, power)
+		power := mins.red * mins.blue * mins.green
+		aoc.Log("game", i, "mins", mins, power)
 		powerSum += power
 	}
-	fmt.Println("sum", sum, "power", powerSum)
+	return &result{sum, powerSum}, nil
 }
--- a/day02/main_test.go
+++ b/day02/main_test.go
@ -0,0 +1,41 @@
+package main
+
+import (
+	"bufio"
+	"bytes"
+	"testing"
+
+	_ "embed"
+
+	"github.com/matryer/is"
+)
+
+//go:embed example.txt
+var example []byte
+
+//go:embed input.txt
+var input []byte
+
+func TestExample(t *testing.T) {
+	is := is.New(t)
+	scan := bufio.NewScanner(bytes.NewReader(example))
+
+	result, err := run(scan)
+	is.NoErr(err)
+
+	t.Log(result)
+	is.Equal(result.sum, 8)
+	is.Equal(result.powerSum, 2286)
+}
+
+func TestSolution(t *testing.T) {
+	is := is.New(t)
+	scan := bufio.NewScanner(bytes.NewReader(input))
+
+	result, err := run(scan)
+	is.NoErr(err)
+
+	t.Log(result)
+	is.Equal(result.sum, 2317)
+	is.Equal(result.powerSum, 74804)
+}
--- a/day03/main.go
+++ b/day03/main.go
@ -2,14 +2,14 @@ package main

 import (
 	"bufio"
-	"bytes"
 	_ "embed"
 	"fmt"
 	"strconv"
+
+	aoc "go.sour.is/advent-of-code"
 )

-//go:embed input.txt
-var input []byte
+func main() { aoc.MustResult(aoc.Runner(run)) }

 type partNumber struct {
 	number    int
@ -56,10 +56,12 @@ func (tab symbolTab) scanSymbol(p partNumber) bool {
 // 553079
 // 84363105

-func main() {
-	buf := bytes.NewReader(input)
-	scan := bufio.NewScanner(buf)
+type result struct {
+	valuePT1 int
+	valuePT2 int
+}

+func run(scan *bufio.Scanner) (*result, error) {
 	parts := []partNumber{}
 	symbols := make(symbolTab)
 	symbolList := []*symbol{}
@ -95,28 +97,32 @@ func main() {
 		if v, err := strconv.Atoi(string(slice)); err == nil {
 			parts = append(parts, partNumber{number: v, row: row, col: col - len(slice), end: col - 1})
 			slice = slice[:0]
+			_ = slice
 		}
 	}

-	sum := 0
-	for i, p := range parts {
-		ok := symbols.scanSymbol(p)
-		parts[i].hasSymbol = ok
-		if ok {
-			sum += p.number
-		}
-	}
+	sum := aoc.SumIFunc(
+		func(i int, p partNumber) int {
+			ok := symbols.scanSymbol(p)
+			parts[i].hasSymbol = ok
+			if ok {
+				return p.number
+			}
+			return 0
+		}, parts...)

-	sumGears := 0
-	for _, s := range symbolList {
-		if s.symbol == '*' && len(s.adjacentParts) == 2 {
-			sumGears += s.adjacentParts[0].number * s.adjacentParts[1].number
-		}
-	}
+	sumGears := aoc.SumFunc(
+		func(s *symbol) int {
+			if s.symbol == '*' && len(s.adjacentParts) == 2 {
+				return s.adjacentParts[0].number * s.adjacentParts[1].number
+			}
+			return 0
+		}, symbolList...)

 	// fmt.Println(parts)
 	// fmt.Println(symbols)
 	// fmt.Println(symbolList)
 	fmt.Println("part1:", sum)
 	fmt.Println("part2:", sumGears)
+	return &result{sum, sumGears}, nil
 }
--- a/day03/main_test.go
+++ b/day03/main_test.go
@ -0,0 +1,43 @@
+package main
+
+import (
+	"bufio"
+	"bytes"
+	_ "embed"
+	"testing"
+
+	"github.com/matryer/is"
+)
+
+//go:embed example.txt
+var example []byte
+
+//go:embed input.txt
+var input []byte
+
+func TestExample(t *testing.T) {
+	is := is.New(t)
+	scan := bufio.NewScanner(bytes.NewReader(example))
+
+	result, err := run(scan)
+	is.NoErr(err)
+
+	t.Log(result)
+	is.Equal(result.valuePT1, int(4361))
+
+	is.Equal(result.valuePT2, 467835)
+}
+
+func TestInput(t *testing.T) {
+	is := is.New(t)
+	scan := bufio.NewScanner(bytes.NewReader(input))
+
+	result, err := run(scan)
+	is.NoErr(err)
+
+	t.Log(result.valuePT1)
+	is.Equal(result.valuePT1, int(553079))
+
+	t.Log(result.valuePT2)
+	is.Equal(result.valuePT2, 84363105)
+}
--- a/day04/main.go
+++ b/day04/main.go
@ -2,13 +2,12 @@ package main

 import (
 	"bufio"
-	"bytes"
 	_ "embed"
-	"fmt"
 	"log/slog"
-	"os"
 	"strconv"
 	"strings"
+
+	aoc "go.sour.is/advent-of-code"
 )

 //go:embed input.txt
@ -21,22 +20,14 @@ type card struct {
 	copies  int
 }

-func main() {
-	var level slog.Level
-	if err := level.UnmarshalText([]byte(os.Getenv("DEBUG_LEVEL"))); err == nil && level != 0 {
-		slog.SetDefault(slog.New(slog.NewTextHandler(os.Stderr, &slog.HandlerOptions{Level: level})))
-	}
+func main() { aoc.MustResult(aoc.Runner(run)) }

-	buf := bytes.NewReader(input)
-	scan := bufio.NewScanner(buf)
-
-	points, cards := run(scan)
-
-	fmt.Println("points:", points)
-	fmt.Println("cards:", cards)
+type result struct {
+	points int
+	cards  int
 }

-func run(scan *bufio.Scanner) (int, int) {
+func run(scan *bufio.Scanner) (result, error) {
 	cards := []*card{}

 	for scan.Scan() {
@ -46,7 +37,7 @@ func run(scan *bufio.Scanner) (int, int) {
 			continue
 		}

-		num, _ := strconv.Atoi(strings.TrimSpace(strings.SplitN(pfx, " ", 2)[1]))
+		num := aoc.Atoi(strings.TrimSpace(strings.SplitN(pfx, " ", 2)[1]))
 		cards = append(cards, &card{card: num})
 		buf := make([]rune, 0, 4)
 		winner := true
@ -71,7 +62,7 @@ func run(scan *bufio.Scanner) (int, int) {
 		}

 		if len(buf) > 0 {
-			num, _ = strconv.Atoi(string(buf))
+			num = aoc.Atoi(string(buf))
 			buf = buf[:0]
 			_ = buf // ignore
 			cards[len(cards)-1].scratch = append(cards[len(cards)-1].scratch, num)
@ -105,5 +96,5 @@ func run(scan *bufio.Scanner) (int, int) {
 		slog.Debug("points", "card", card.card, "match", m, "score", sumPoints)
 	}

-	return sumPoints, sumCards
+	return result{sumPoints, sumCards}, nil
 }
--- a/day04/main_test.go
+++ b/day04/main_test.go
@ -17,16 +17,18 @@ func TestExample(t *testing.T) {
 	is := is.New(t)
 	scan := bufio.NewScanner(bytes.NewReader(example))

-	points, cards := run(scan)
-	is.Equal(points, 13)
-	is.Equal(cards, 30)
+	r, err := run(scan)
+	is.NoErr(err)
+	is.Equal(r.points, 13)
+	is.Equal(r.cards, 30)
 }

 func TestSolution(t *testing.T) {
 	is := is.New(t)
 	scan := bufio.NewScanner(bytes.NewReader(input))

-	points, cards := run(scan)
-	is.Equal(points, 23235)
-	is.Equal(cards, 5920640)
+	r, err := run(scan)
+	is.NoErr(err)
+	is.Equal(r.points, 23235)
+	is.Equal(r.cards, 5920640)
 }
--- a/day05/main.go
+++ b/day05/main.go
@ -7,27 +7,18 @@ import (
 	"sort"
 	"strconv"
 	"strings"
+
+	aoc "go.sour.is/advent-of-code"
 )

-func main() {
-	if len(os.Args) != 2 {
-		fmt.Fprintln(os.Stderr, "Usage: day05 FILE")
-	}
+func main() { aoc.MustResult(aoc.Runner(run)) }

-	input, err := os.Open(os.Args[1])
-	if err != nil {
-		fmt.Fprintln(os.Stderr, err)
-	}
-
-	scan := bufio.NewScanner(input)
-
-	minLocation, minRangeLocation := run(scan)
-
-	fmt.Println("min location:", minLocation)
-	fmt.Println("min range location:", minRangeLocation)
+type result struct {
+	minLocation int
+	minRange    int
 }

-func run(scan *bufio.Scanner) (int, int) {
+func run(scan *bufio.Scanner) (result, error) {
 	log("begin...")

 	var seeds []int
@ -55,15 +46,14 @@ func run(scan *bufio.Scanner) (int, int) {
 		lookup["humidity-to-location"],
 	)

-	return findMinLocation(seeds, find), FindMinRangeLocationMulti(seedRanges, find)
+	return result{findMinLocation(seeds, find), FindMinRangeLocationMulti(seedRanges, find)}, nil
 }

 func readSeeds(text string) ([]int, [][2]int) {
-	var seeds [] int 
+	var seeds []int
 	var seedRanges [][2]int
-	sp := strings.Fields(strings.TrimPrefix(text, "seeds: "))
-	for i, s := range sp {
-		n, _ := strconv.Atoi(s)
+
+	for i, n := range aoc.SliceMap(aoc.Atoi, strings.Fields(strings.TrimPrefix(text, "seeds: "))...) {
 		seeds = append(seeds, n)

 		if i%2 == 0 {
@ -121,7 +111,7 @@ func FindMinRangeLocation(ranges [][2]int, find *Finder) int {

 	for _, s := range ranges {
 		for i := 0; i < s[1]; i++ {
-			seedLocations = append(seedLocations, find.Find(s[0] + i))
+			seedLocations = append(seedLocations, find.Find(s[0]+i))
 		}
 	}
 	return min(seedLocations...)
@ -164,7 +154,7 @@ func FindMinRangeLocationMulti(ranges [][2]int, find *Finder) int {
 	seedLocations := make([]int, 0, results)
 	expectResults := make([]struct{}, len(ranges))
 	for range expectResults {
-		r := <- resultsCh
+		r := <-resultsCh
 		seedLocations = append(seedLocations, r...)
 	}

--- a/day05/main_test.go
+++ b/day05/main_test.go
@ -20,19 +20,20 @@ func TestExample(t *testing.T) {
 	is := is.New(t)
 	scan := bufio.NewScanner(bytes.NewReader(example))

-	minLocation, minRangeLocation := run(scan)
-	is.Equal(minLocation, 35)
-	is.Equal(minRangeLocation, 46)
+	r, err := run(scan)
+	is.NoErr(err)
+	is.Equal(r.minLocation, 35)
+	is.Equal(r.minRange, 46)
 }

 func SkipTestSolution(t *testing.T) {
 	is := is.New(t)
 	scan := bufio.NewScanner(bytes.NewReader(input))

-	minLocation, minRangeLocation := run(scan)
-	is.Equal(minLocation, 199602917)
-	is.Equal(minRangeLocation, 0)
-
+	r, err := run(scan)
+	is.NoErr(err)
+	is.Equal(r.minLocation, 199602917)
+	is.Equal(r.minRange, 2254686)
 }

 func TestLookup(t *testing.T) {
@ -44,9 +45,9 @@ func TestLookup(t *testing.T) {
 	is.Equal(find.Find(79), 81)

 	find = &Lookup{ranges: Ranges{
-		{77,45,23},
-		{45,81,19},
-		{64,68,13},
+		{77, 45, 23},
+		{45, 81, 19},
+		{64, 68, 13},
 	}}
 	is.Equal(find.Find(77), 45)

@ -62,37 +63,37 @@ func TestFinder(t *testing.T) {
 		}},
 		// soil-to-fertilizer
 		&Lookup{ranges: Ranges{
-			{15, 0,37},
-			{52,37,2},
-			{0,39,15},
+			{15, 0, 37},
+			{52, 37, 2},
+			{0, 39, 15},
 		}},
 		// fertilizer-to-water
 		&Lookup{ranges: Ranges{
-			{53,49,8},
-			{11,0,42},
-			{0,42,7},
-			{7,57,4},
+			{53, 49, 8},
+			{11, 0, 42},
+			{0, 42, 7},
+			{7, 57, 4},
 		}},
 		// water-to-light
 		&Lookup{ranges: Ranges{
-			{18,88,7},
-			{25,18,70},
+			{18, 88, 7},
+			{25, 18, 70},
 		}},
 		// light-to-temperature
 		&Lookup{ranges: Ranges{
-			{77,45,23},
-			{45,81,19},
-			{64,68,13},
+			{77, 45, 23},
+			{45, 81, 19},
+			{64, 68, 13},
 		}},
 		// temperature-to-humidity
 		&Lookup{ranges: Ranges{
-			{69,0,1},
-			{0,1,69},
+			{69, 0, 1},
+			{0, 1, 69},
 		}},
 		// humidity-to-location
 		&Lookup{ranges: Ranges{
-			{56,60,37},
-			{93,56,4},
+			{56, 60, 37},
+			{93, 56, 4},
 		}},
 	)
 	is.Equal(find.Find(82), 46)
--- a/day07/main.go
+++ b/day07/main.go
@ -3,29 +3,19 @@ package main
 import (
 	"bufio"
 	"fmt"
-	"os"
 	"sort"
+
+	aoc "go.sour.is/advent-of-code"
 )

-func main() {
-	if len(os.Args) != 2 {
-		fmt.Fprintln(os.Stderr, "Usage: day07 FILE")
-	}
+func main() { aoc.MustResult(aoc.Runner(run)) }

-	input, err := os.Open(os.Args[1])
-	if err != nil {
-		fmt.Fprintln(os.Stderr, err)
-	}
-
-	scan := bufio.NewScanner(input)
-
-	score1, score2 := run(scan)
-
-	fmt.Println("score 1", score1)
-	fmt.Println("score 2", score2)
+type result struct {
+	valuePT1 uint64
+	valuePT2 uint64
 }

-func run(scan *bufio.Scanner) (uint64, uint64) {
+func run(scan *bufio.Scanner) (result, error) {
 	var game1, game2 Game

 	for scan.Scan() {
@ -50,7 +40,7 @@ func run(scan *bufio.Scanner) (uint64, uint64) {
 	game2.wildCard = 'J'
 	product2 := calcProduct(game2)

-	return product1, product2
+	return result{product1, product2}, nil
 }

 var cardTypes1 = []rune{'A', 'K', 'Q', 'J', 'T', '9', '8', '7', '6', '5', '4', '3', '2'}
--- a/day07/main_test.go
+++ b/day07/main_test.go
@ -57,19 +57,21 @@ func TestExample(t *testing.T) {
 	is := is.New(t)
 	scan := bufio.NewScanner(bytes.NewReader(example))

-	score1, score2 := run(scan)
-	is.Equal(score1, uint64(6440))
-	is.Equal(score2, uint64(5905))
+	r, err := run(scan)
+	is.NoErr(err)
+	is.Equal(r.valuePT1, uint64(6440))
+	is.Equal(r.valuePT2, uint64(5905))
 }

 func TestSolution(t *testing.T) {
 	is := is.New(t)
 	scan := bufio.NewScanner(bytes.NewReader(input))

-	score1, score2 := run(scan)
-	t.Log("score1", score1)
-	is.Equal(score1, uint64(248559379))
+	r, err := run(scan)
+	is.NoErr(err)
+	t.Log("score1", r.valuePT1)
+	is.Equal(r.valuePT1, uint64(248559379))

-	t.Log("score2", score2)
-	is.Equal(score2, uint64(249631254))
+	t.Log("score2", r.valuePT2)
+	is.Equal(r.valuePT2, uint64(249631254))
 }
--- a/day08/example1.txt
+++ b/day08/example1.txt
@ -0,0 +1,9 @@
+RL
+
+AAA = (BBB, CCC)
+BBB = (DDD, EEE)
+CCC = (ZZZ, GGG)
+DDD = (DDD, DDD)
+EEE = (EEE, EEE)
+GGG = (GGG, GGG)
+ZZZ = (ZZZ, ZZZ)
--- a/day08/example2.txt
+++ b/day08/example2.txt
@ -0,0 +1,5 @@
+LLR
+
+AAA = (BBB, BBB)
+BBB = (AAA, ZZZ)
+ZZZ = (ZZZ, ZZZ)
--- a/day08/example3.txt
+++ b/day08/example3.txt
@ -0,0 +1,10 @@
+LR
+
+11A = (11B, XXX)
+11B = (XXX, 11Z)
+11Z = (11B, XXX)
+22A = (22B, XXX)
+22B = (22C, 22C)
+22C = (22Z, 22Z)
+22Z = (22B, 22B)
+XXX = (XXX, XXX)
--- a/day08/input.txt
+++ b/day08/input.txt
@ -0,0 +1,708 @@
+LLLLRLRLRRLRRRLRRLRLRRLRLLRRRLRRLRRRLRLLLRLRRLRLLRRRLRRLRLRRLLRRRLRRRLRLRRLRRRLRRLRRLLRRRLLLLRRLRRLRRLRRRLLLRLRLRLRRLRRRLRLRRRLRLRRRLRRLRRLLRRLLRLRRRLRLRRRLLLRLRRRLRLRRRLRRLRLRRLRRRLRRRLRRLLLRRRLRRLRRLRRLRRRLLLRRLRLRRRLLLLRRRLRRLRRRLLRLRLRRLLRRRLLRLRLRLRRLRRLRRRLRRLLRLRRLRRLLLLRRLRLRRLLRRLLRRLRRLRRRLLLRRRR
+
+BRR = (LVC, FSJ)
+BHX = (GMG, QTN)
+TJD = (HQF, PBJ)
+JGN = (JXR, DGK)
+NMC = (VPC, CRF)
+DVJ = (KMM, DFJ)
+LML = (MTG, KNX)
+JKL = (LRX, FRD)
+FJR = (MHX, SBX)
+LMC = (QNB, QCK)
+LJF = (KCJ, HCT)
+KTL = (XTG, NGM)
+GJB = (KTQ, KTQ)
+BXR = (TDR, KMK)
+GKB = (VXT, NQR)
+PJL = (FPL, TFX)
+LNZ = (CJC, DQL)
+KCG = (KDL, LMF)
+PGG = (NDL, XXC)
+PMS = (XQM, DFG)
+CJF = (MCG, RTJ)
+JTH = (PGS, SGZ)
+QBS = (JSC, KMT)
+DQL = (KRR, PBL)
+HSF = (SNP, KJR)
+XVQ = (VQR, HSX)
+QKF = (PBT, XLC)
+DNA = (DQL, CJC)
+LNF = (RVC, TJD)
+MKT = (LDX, CGC)
+BXP = (RGX, TTR)
+SBX = (PGT, JGN)
+JQK = (HDQ, BHQ)
+MHL = (TLX, JDN)
+BBD = (QNJ, BRM)
+MTT = (BVK, DXB)
+FVR = (VLN, PRV)
+RVC = (HQF, PBJ)
+LDX = (LRS, KBV)
+BKF = (PXH, TNB)
+BRM = (XTV, NGH)
+DDL = (JNG, SFF)
+BBT = (BQJ, BCN)
+GPK = (CVK, DDL)
+TLX = (BDN, XNT)
+JHL = (BRX, QBT)
+NTL = (HSR, DJD)
+XBH = (PJX, JQK)
+PPF = (LCT, BJL)
+SFF = (FVR, NFG)
+HNA = (CTC, BSG)
+CNG = (DXM, QFN)
+GML = (NRD, TVN)
+RHH = (NBT, LJH)
+LDM = (DDN, TRN)
+XSK = (PLB, NVJ)
+NCQ = (MDN, XGT)
+FCQ = (HCT, KCJ)
+DRC = (JKL, JNM)
+SHR = (KLX, VLH)
+FTP = (DRN, DKV)
+QBF = (GVS, NXK)
+GXK = (XDK, LVF)
+KMK = (VXV, XCS)
+PKK = (QNJ, BRM)
+NJH = (TKL, PQK)
+BRX = (MNM, HVC)
+VTD = (BJK, LML)
+QVX = (DVJ, DSF)
+GRM = (JCV, SQB)
+RDQ = (HCG, XMB)
+RGX = (FCN, TPD)
+HBH = (FPR, DHX)
+PHM = (JSP, RCR)
+NBT = (FRG, CMJ)
+XRH = (HCB, FBM)
+GMR = (FDJ, NJD)
+MVG = (RDJ, QSD)
+BDL = (JSB, TFN)
+VXT = (MBM, JND)
+TXC = (QDG, LTV)
+SRL = (RRX, NDS)
+SGN = (MPL, CBB)
+HVH = (SLJ, CBC)
+VPC = (CCG, QSJ)
+KCJ = (CKC, TTD)
+RLT = (LLT, VVL)
+RXV = (KXQ, VBR)
+FQS = (STP, BHX)
+SGC = (RLJ, QGB)
+XLX = (HRG, DGV)
+XKV = (QQB, TNQ)
+SLJ = (GTB, MPF)
+PKV = (CQN, THS)
+RPP = (QFT, TNK)
+DKL = (MFC, MFC)
+BCG = (FXM, GPR)
+RFV = (DRC, MPD)
+VVC = (FGN, CVL)
+HQB = (QNT, VVC)
+RRP = (VVC, QNT)
+TRS = (RCM, GHN)
+QBT = (HVC, MNM)
+XKS = (SCC, VXX)
+TPS = (FMH, KFN)
+MTS = (VXT, NQR)
+FXM = (LDM, FQT)
+LNB = (XJV, SJN)
+HVF = (QXC, RBH)
+LSG = (QHM, TSM)
+JMP = (HBH, NQK)
+NGM = (KDP, HHP)
+HCG = (SLR, TSC)
+HGX = (DFG, XQM)
+DLG = (BVN, GMM)
+DJD = (VGP, VML)
+HBT = (XKL, JBQ)
+NVJ = (GKX, PKS)
+CPS = (PKJ, RSV)
+SKN = (NBT, LJH)
+CCK = (TTJ, SLV)
+DXM = (CBN, BXR)
+RJD = (XJH, SKH)
+RDJ = (CNF, TTG)
+PKJ = (BCM, XKC)
+FQL = (SRV, DFC)
+KDS = (MFB, CLQ)
+QKR = (VGD, CXK)
+XXC = (NFD, SPS)
+PSQ = (NJH, BLR)
+BLR = (PQK, TKL)
+LMX = (DGV, HRG)
+GCK = (CSR, CSR)
+GKJ = (JHL, PNN)
+GVS = (TLN, LJX)
+FPR = (JCH, GKD)
+VQV = (DGB, GGN)
+CPF = (VMH, JQQ)
+GKD = (SGF, PHM)
+JNM = (LRX, FRD)
+CXV = (LNF, HGF)
+TNK = (RRD, HKC)
+DXX = (LMC, ZZZ)
+DGG = (PPF, TRR)
+MLH = (TVL, PBR)
+LBC = (LJL, FTR)
+FVQ = (TBC, LKB)
+LTF = (CBC, SLJ)
+TVH = (XMS, GJS)
+SFB = (TTJ, SLV)
+LVF = (MBT, SJB)
+XPP = (QDM, PJL)
+BVK = (RPV, JMP)
+VGD = (MRX, FJR)
+FRD = (XBH, CDN)
+LKM = (CMF, XNS)
+TCJ = (MMS, PGG)
+DHQ = (MTT, BKS)
+HDQ = (GPH, XKH)
+KTJ = (QQT, MKR)
+NMQ = (VFK, VSD)
+RSK = (QDM, PJL)
+XQC = (KFP, HVB)
+LQN = (NGM, XTG)
+TKG = (XDQ, XDQ)
+KBB = (VQR, HSX)
+TQQ = (QDG, LTV)
+SQN = (TDQ, XKV)
+TSM = (TSH, MRP)
+KPH = (THS, CQN)
+HCB = (DVL, RTV)
+MLR = (GHT, NSN)
+BFM = (GCK, SLX)
+GXQ = (QKM, JJL)
+GNF = (HRQ, XTK)
+TRR = (BJL, LCT)
+AAA = (QNB, QCK)
+SDL = (KJX, LSN)
+DKV = (KBB, XVQ)
+RMR = (MQR, CPR)
+MQC = (CBV, SRP)
+PRV = (KDS, FBX)
+GTB = (CCK, SFB)
+SNP = (PXX, SHR)
+NTR = (VHT, KXK)
+MKJ = (DDL, CVK)
+LSQ = (HSF, RMN)
+TTJ = (CBH, QKF)
+DNH = (MVG, JCJ)
+KMM = (KPH, PKV)
+NTT = (RQK, PFK)
+QMF = (BFM, PJB)
+RJB = (RBH, QXC)
+LRS = (MJT, BVM)
+CJG = (RMR, BMN)
+DVQ = (GXM, DDH)
+MFC = (LMC, LMC)
+XTG = (HHP, KDP)
+HKB = (RDQ, TVT)
+PKS = (JQM, DGG)
+BJK = (KNX, MTG)
+TVT = (XMB, HCG)
+JNR = (JHG, JLN)
+VFK = (XKS, QBH)
+NPC = (PKK, BBD)
+PXX = (KLX, VLH)
+XLC = (NST, BXP)
+CBB = (LMX, XLX)
+KLX = (MSH, LCF)
+CLQ = (JNF, JNC)
+TSS = (MKR, QQT)
+SSS = (RMQ, RCS)
+QSD = (TTG, CNF)
+NHG = (DVQ, VNB)
+CTC = (VCN, RJD)
+THS = (QRH, GPT)
+KDR = (RTK, GKJ)
+NTD = (CGG, SPN)
+GHP = (NCQ, FCD)
+KXQ = (RLS, VRM)
+GNV = (BQJ, BCN)
+DXQ = (QHC, FXN)
+RQB = (FVQ, TNF)
+CNF = (TXC, TQQ)
+BGB = (QQS, LRV)
+ZZZ = (QCK, QNB)
+NFM = (MGV, VTD)
+MFD = (DBF, KSN)
+NST = (RGX, TTR)
+XJV = (LGL, LGL)
+TRQ = (TVH, KJL)
+PPV = (CJP, VHH)
+DNV = (DBM, VGJ)
+JBQ = (MHL, RFN)
+HRG = (JFD, VQP)
+RMB = (JKJ, JGJ)
+RGQ = (RSK, XPP)
+KHF = (TJG, KPX)
+HPZ = (BSG, CTC)
+LFJ = (TSN, NMB)
+MBT = (XRC, PJR)
+QFN = (CBN, BXR)
+QSJ = (BRS, BKF)
+XJH = (RSF, VNP)
+GST = (LVF, XDK)
+DDN = (NMS, RLT)
+CXK = (FJR, MRX)
+PHH = (FPB, TCJ)
+XHV = (KTJ, TSS)
+VHT = (NPC, DMG)
+RNL = (NHG, DVN)
+TKL = (KPN, FKX)
+DGB = (GPJ, QMF)
+PNN = (QBT, BRX)
+TBC = (NTR, FKG)
+PGS = (QDT, JQL)
+SLX = (CSR, LNB)
+BVV = (LVC, FSJ)
+JQL = (MLH, GSC)
+PXH = (CJF, CKM)
+LHM = (DSF, DVJ)
+NND = (NTD, DTB)
+MFB = (JNF, JNC)
+TTR = (FCN, TPD)
+HRQ = (JTD, JTD)
+SLR = (TXT, JSN)
+VQP = (XPK, XGB)
+QHM = (MRP, TSH)
+RTJ = (PXB, TLP)
+QQT = (RRL, QHQ)
+CSR = (XJV, XJV)
+CJP = (CJG, HQQ)
+RMC = (MPD, DRC)
+XMS = (LXX, GPN)
+HSR = (VGP, VML)
+MNM = (VSS, QXR)
+SJN = (LGL, LNZ)
+KBV = (MJT, BVM)
+KFN = (NRC, VSG)
+JNC = (RHR, LFJ)
+MPF = (SFB, CCK)
+QVK = (GNK, BCG)
+NJD = (KCG, LDB)
+DBM = (MJG, MFD)
+NKF = (GGN, DGB)
+BCN = (JNR, MHK)
+GNK = (FXM, GPR)
+KMT = (HFC, CPS)
+FDJ = (KCG, LDB)
+LVD = (PHH, QDR)
+FCN = (VDP, MQC)
+QQB = (GJB, GJB)
+PLF = (JNL, HBT)
+QDM = (FPL, TFX)
+GXM = (CLD, NNL)
+MRV = (BCG, GNK)
+LKB = (NTR, FKG)
+TTG = (TQQ, TXC)
+GFD = (VSD, VFK)
+RCS = (KQQ, DNH)
+QXR = (FCQ, LJF)
+HMQ = (RJQ, FQL)
+VCN = (SKH, XJH)
+QQG = (HSR, DJD)
+HGF = (RVC, TJD)
+XMB = (TSC, SLR)
+PJB = (GCK, SLX)
+HFC = (RSV, PKJ)
+JJL = (GXK, GST)
+QTN = (JLV, SGX)
+KDP = (GNV, BBT)
+VRF = (TFN, JSB)
+GPN = (CPF, SRQ)
+TSC = (TXT, JSN)
+CRF = (QSJ, CCG)
+TNF = (TBC, LKB)
+VLH = (LCF, MSH)
+BCV = (JSC, KMT)
+NNL = (KVX, FQS)
+RVT = (HCB, FBM)
+QHC = (QKV, NCJ)
+VDP = (CBV, SRP)
+CBV = (VQV, NKF)
+CMF = (XHV, TPR)
+TRN = (RLT, NMS)
+JSB = (XTH, TRS)
+CFC = (TVT, RDQ)
+KDL = (TKG, TKG)
+TTD = (BBC, GHP)
+KJR = (PXX, SHR)
+MTV = (GVS, NXK)
+BVN = (KDR, PVP)
+DXB = (RPV, JMP)
+FSJ = (QPQ, GML)
+PBJ = (LQN, KTL)
+PXB = (BDL, VRF)
+NDS = (BGB, NGX)
+CBN = (KMK, TDR)
+NFG = (VLN, PRV)
+JTD = (PGS, PGS)
+MKR = (QHQ, RRL)
+JSN = (RFV, RMC)
+CVK = (SFF, JNG)
+FGN = (BVQ, XQC)
+HHF = (RPS, QQF)
+PLB = (PKS, GKX)
+BJB = (QMC, GPG)
+STP = (QTN, GMG)
+DGK = (RKK, BVT)
+JJM = (VGD, CXK)
+LTS = (QPN, BCL)
+LVC = (QPQ, GML)
+QNB = (GJN, RVB)
+RBH = (HMQ, HPS)
+NQK = (DHX, FPR)
+MRP = (BDT, SGN)
+JQM = (TRR, PPF)
+TSH = (BDT, SGN)
+JLN = (JCC, FCB)
+BRP = (LDX, CGC)
+SJC = (HRQ, HRQ)
+LJL = (BVB, PPV)
+SPN = (SDL, VHM)
+SDM = (DDF, LTS)
+LJH = (FRG, CMJ)
+CMG = (MKD, JGT)
+GPR = (LDM, FQT)
+QPQ = (NRD, TVN)
+JCJ = (RDJ, QSD)
+HSX = (CMG, SHF)
+VML = (RMB, MHC)
+DHX = (JCH, GKD)
+MTG = (FPX, SPD)
+BDT = (MPL, CBB)
+CJC = (PBL, KRR)
+JLS = (LJL, FTR)
+HQF = (LQN, KTL)
+HQQ = (RMR, BMN)
+QMC = (RBP, PXD)
+RPV = (HBH, NQK)
+JHG = (JCC, FCB)
+TPD = (VDP, MQC)
+BHQ = (XKH, GPH)
+XKC = (HDD, GXR)
+RPS = (KJP, KJP)
+QNT = (CVL, FGN)
+JSC = (HFC, CPS)
+KXG = (DTB, NTD)
+CKM = (RTJ, MCG)
+FTD = (KPX, TJG)
+VSD = (XKS, QBH)
+MCG = (TLP, PXB)
+XKH = (HLP, CXV)
+TNB = (CJF, CKM)
+XTH = (RCM, GHN)
+DFN = (GMR, DSS)
+LMF = (TKG, XST)
+FMH = (NRC, VSG)
+XCS = (JTS, GRM)
+GVF = (NDS, RRX)
+CXM = (HGX, PMS)
+VRM = (XJT, DXQ)
+JLV = (QVX, LHM)
+JCH = (PHM, SGF)
+NMS = (VVL, LLT)
+BHS = (XJR, LKM)
+CKC = (BBC, GHP)
+CBH = (XLC, PBT)
+PRL = (QFT, TNK)
+SDF = (VTD, MGV)
+RVB = (MLR, XHT)
+GPT = (PLF, MJX)
+KRR = (RVT, XRH)
+GXR = (BVV, BRR)
+NSN = (RGQ, JMQ)
+KJX = (TCR, MSL)
+PHL = (TSM, QHM)
+MQR = (MTS, GKB)
+XDK = (SJB, MBT)
+NRC = (DGN, BJB)
+JQQ = (LBC, JLS)
+JTS = (JCV, SQB)
+RLJ = (JJM, QKR)
+DTB = (CGG, SPN)
+BRS = (PXH, TNB)
+SRV = (SPC, DNV)
+MNP = (JJL, QKM)
+KTQ = (XSK, XSK)
+FPX = (SJC, GNF)
+VBR = (VRM, RLS)
+KSN = (HQB, RRP)
+RJQ = (SRV, DFC)
+BKS = (BVK, DXB)
+BVB = (VHH, CJP)
+XTK = (JTD, JTH)
+PBT = (BXP, NST)
+PVP = (RTK, GKJ)
+QPN = (BCV, QBS)
+QQF = (KJP, HPZ)
+QRH = (PLF, MJX)
+GHS = (BKN, TPS)
+RCM = (MNP, GXQ)
+DCT = (DDF, LTS)
+JLC = (HGX, PMS)
+VNC = (XSK, CXZ)
+BQJ = (MHK, JNR)
+SHF = (JGT, MKD)
+FXN = (QKV, NCJ)
+FPB = (PGG, MMS)
+JGJ = (KXG, NND)
+VBM = (PSQ, QKN)
+GKX = (DGG, JQM)
+DSF = (KMM, DFJ)
+CMJ = (GPK, MKJ)
+NCJ = (SDM, DCT)
+MKD = (GQG, DHQ)
+CFZ = (RQB, SHH)
+RQK = (DKL, DKL)
+XGT = (HPQ, VRQ)
+SRP = (NKF, VQV)
+BSG = (VCN, RJD)
+XRC = (NFM, SDF)
+DVL = (SRL, GVF)
+HVB = (HXS, MLD)
+MPD = (JNM, JKL)
+JSP = (PHL, LSG)
+BCR = (XJR, LKM)
+PQK = (KPN, FKX)
+FCD = (XGT, MDN)
+MDL = (JLC, CXM)
+FBX = (CLQ, MFB)
+VNP = (RGM, GHS)
+HMK = (RMN, HSF)
+SJB = (PJR, XRC)
+JFD = (XPK, XGB)
+HHP = (GNV, BBT)
+TVN = (VBM, KJN)
+DMG = (PKK, BBD)
+RGM = (BKN, TPS)
+TRF = (KXQ, VBR)
+XHT = (NSN, GHT)
+DFJ = (KPH, PKV)
+KJP = (CTC, BSG)
+LLT = (NTS, LVD)
+RMN = (SNP, KJR)
+GSC = (TVL, PBR)
+RSV = (XKC, BCM)
+TLP = (VRF, BDL)
+GGN = (GPJ, QMF)
+XJR = (CMF, XNS)
+GQG = (BKS, MTT)
+JPN = (MRV, QVK)
+RSF = (RGM, GHS)
+QQS = (DLG, JPV)
+DGV = (VQP, JFD)
+JDN = (XNT, BDN)
+LMA = (QDT, JQL)
+QDG = (QGC, DTX)
+HDD = (BVV, BRR)
+RRD = (CNG, XLJ)
+QBH = (VXX, SCC)
+GPH = (HLP, CXV)
+CVN = (MRV, QVK)
+RLS = (XJT, DXQ)
+QKN = (NJH, BLR)
+NRD = (VBM, KJN)
+NMB = (HVF, RJB)
+XNT = (RXV, TRF)
+XNS = (XHV, TPR)
+SGX = (LHM, QVX)
+NTS = (PHH, QDR)
+SPS = (LTF, HVH)
+KPX = (BCR, BHS)
+GNM = (RPS, RPS)
+CXZ = (NVJ, PLB)
+VVL = (LVD, NTS)
+VTC = (NHG, DVN)
+PXD = (BHH, SSS)
+TVL = (MKT, BRP)
+TPR = (KTJ, TSS)
+MJX = (JNL, HBT)
+BKN = (FMH, KFN)
+MBM = (BVC, FTP)
+RTV = (GVF, SRL)
+GPG = (PXD, RBP)
+KXK = (DMG, NPC)
+JPV = (GMM, BVN)
+LXP = (VPC, CRF)
+RMQ = (DNH, KQQ)
+DRN = (KBB, XVQ)
+MMS = (XXC, NDL)
+GMG = (SGX, JLV)
+MJT = (KHF, FTD)
+XJT = (QHC, FXN)
+JMQ = (XPP, RSK)
+QCS = (TVH, KJL)
+BVC = (DRN, DKV)
+SPC = (DBM, VGJ)
+SHH = (TNF, FVQ)
+VGA = (PLB, NVJ)
+RKK = (JPN, CVN)
+SCC = (TRQ, QCS)
+CDN = (JQK, PJX)
+VSS = (LJF, FCQ)
+JNF = (LFJ, RHR)
+VGP = (MHC, RMB)
+VGJ = (MJG, MFD)
+QGC = (RHH, SKN)
+RKJ = (KTQ, VNC)
+DTX = (SKN, RHH)
+HPQ = (VDR, SGC)
+CCG = (BRS, BKF)
+VLN = (FBX, KDS)
+BHH = (RMQ, RCS)
+BBC = (FCD, NCQ)
+JCV = (GNM, GNM)
+TNQ = (GJB, RKJ)
+QNJ = (NGH, XTV)
+GHT = (RGQ, JMQ)
+LJX = (CFC, HKB)
+TLN = (HKB, CFC)
+PFK = (DKL, LFL)
+PJR = (SDF, NFM)
+JNG = (NFG, FVR)
+PJX = (BHQ, HDQ)
+VHH = (CJG, HQQ)
+RTK = (PNN, JHL)
+XGB = (MLN, SQN)
+JCC = (NQX, NTT)
+BVT = (CVN, JPN)
+HPS = (RJQ, FQL)
+TCR = (DFN, RHS)
+LLA = (SHH, RQB)
+NGX = (QQS, LRV)
+SLV = (CBH, QKF)
+BMN = (CPR, MQR)
+XKL = (RFN, MHL)
+CGG = (VHM, SDL)
+KJN = (PSQ, QKN)
+LDB = (KDL, LMF)
+SPD = (SJC, GNF)
+VDR = (RLJ, QGB)
+DDF = (QPN, BCL)
+KQQ = (MVG, JCJ)
+DSS = (FDJ, NJD)
+NFD = (HVH, LTF)
+GPJ = (BFM, PJB)
+LGL = (DQL, CJC)
+TDQ = (QQB, TNQ)
+RCR = (PHL, LSG)
+SKH = (VNP, RSF)
+DGN = (QMC, GPG)
+NGH = (RNL, VTC)
+TSN = (HVF, RJB)
+MGV = (LML, BJK)
+QHQ = (LXP, NMC)
+KJL = (GJS, XMS)
+RBP = (BHH, SSS)
+QDR = (FPB, TCJ)
+RHR = (NMB, TSN)
+NXK = (LJX, TLN)
+FCB = (NQX, NTT)
+TFN = (TRS, XTH)
+MJG = (KSN, DBF)
+BVQ = (KFP, HVB)
+GMM = (PVP, KDR)
+MDN = (VRQ, HPQ)
+LTV = (DTX, QGC)
+LRV = (DLG, JPV)
+MHC = (JKJ, JGJ)
+DFC = (DNV, SPC)
+LXV = (SHH, RQB)
+PBL = (RVT, XRH)
+BDN = (RXV, TRF)
+JKJ = (KXG, NND)
+MSH = (MTV, QBF)
+NDL = (SPS, NFD)
+FKG = (VHT, KXK)
+PBR = (MKT, BRP)
+VSG = (BJB, DGN)
+RRX = (BGB, NGX)
+NQR = (JND, MBM)
+MRX = (MHX, SBX)
+DVN = (DVQ, VNB)
+HKC = (CNG, XLJ)
+PGT = (JXR, DGK)
+DBF = (HQB, RRP)
+FRG = (GPK, MKJ)
+DFG = (NMQ, GFD)
+QDT = (MLH, GSC)
+KVX = (STP, BHX)
+LCT = (MDL, KCL)
+LSN = (TCR, MSL)
+TXT = (RMC, RFV)
+MXM = (LXV, CFZ)
+TJG = (BHS, BCR)
+BCM = (GXR, HDD)
+FKX = (NTL, QQG)
+SRQ = (JQQ, VMH)
+BCL = (BCV, QBS)
+LRX = (CDN, XBH)
+RHS = (DSS, GMR)
+CLD = (FQS, KVX)
+XLJ = (DXM, QFN)
+KCL = (CXM, JLC)
+HXS = (PRL, RPP)
+JND = (BVC, FTP)
+VQR = (SHF, CMG)
+VNB = (DDH, GXM)
+QGB = (JJM, QKR)
+CVL = (BVQ, XQC)
+RFN = (JDN, TLX)
+FBM = (DVL, RTV)
+TFX = (LSQ, HMK)
+XQM = (NMQ, GFD)
+BJL = (KCL, MDL)
+FTR = (PPV, BVB)
+KNX = (FPX, SPD)
+MHK = (JHG, JLN)
+TDR = (XCS, VXV)
+HVC = (VSS, QXR)
+QXC = (HPS, HMQ)
+RRL = (NMC, LXP)
+MLD = (PRL, RPP)
+LCF = (MTV, QBF)
+VXV = (JTS, GRM)
+XTV = (RNL, VTC)
+LFL = (MFC, DXX)
+CBC = (GTB, MPF)
+CQN = (GPT, QRH)
+DDH = (NNL, CLD)
+GHN = (GXQ, MNP)
+JGT = (DHQ, GQG)
+HCT = (CKC, TTD)
+QCK = (GJN, RVB)
+SGF = (JSP, RCR)
+MPL = (XLX, LMX)
+XDQ = (LXV, LXV)
+MLN = (TDQ, XKV)
+SGZ = (JQL, QDT)
+VRQ = (SGC, VDR)
+FPL = (LSQ, HMK)
+SQB = (GNM, HHF)
+MHX = (PGT, JGN)
+QFT = (HKC, RRD)
+LXX = (CPF, SRQ)
+CPR = (GKB, MTS)
+HLP = (LNF, HGF)
+GJS = (GPN, LXX)
+QKV = (DCT, SDM)
+XST = (XDQ, MXM)
+VXX = (QCS, TRQ)
+KFP = (HXS, MLD)
+MSL = (RHS, DFN)
+NQX = (RQK, PFK)
+CGC = (LRS, KBV)
+FQT = (TRN, DDN)
+VMH = (LBC, JLS)
+VHM = (LSN, KJX)
+JXR = (BVT, RKK)
+KPN = (QQG, NTL)
+QKM = (GST, GXK)
+JNL = (XKL, JBQ)
+BVM = (KHF, FTD)
+XPK = (SQN, MLN)
+GJN = (MLR, XHT)
--- a/day08/main.go
+++ b/day08/main.go
@ -0,0 +1,149 @@
+package main
+
+import (
+	"bufio"
+	"fmt"
+	"os"
+	"strings"
+
+	aoc "go.sour.is/advent-of-code"
+)
+
+func main() {
+	result, err := aoc.Runner(run)
+	if err != nil {
+		fmt.Println("ERR", err)
+		os.Exit(1)
+	}
+
+	fmt.Println("result", result)
+}
+
+type result struct {
+	stepsPT1 uint64
+	stepsPT2 uint64
+}
+
+func (r result) String() string {
+	return fmt.Sprintf("solution 1: %v\nsolution 2: %v\n", r.stepsPT1, r.stepsPT2)
+}
+
+func run(scan *bufio.Scanner) (*result, error) {
+	var path []rune
+	m := make(nodeMap)
+
+	for scan.Scan() {
+		text := scan.Text()
+		if len(text) == 0 {
+			continue
+		}
+
+		if len(path) == 0 {
+			fmt.Println("path", text)
+			path = []rune(strings.TrimSpace(text))
+			continue
+		}
+
+		n := &node{}
+		i, err := fmt.Sscanf(text, "%s = (%s %s", &n.value, &n.lvalue, &n.rvalue)
+		if err != nil {
+			return nil, err
+		}
+		n.lvalue = strings.TrimRight(n.lvalue, ",)")
+		n.rvalue = strings.TrimRight(n.rvalue, ",)")
+		m[n.value] = n
+
+		fmt.Println("value", i, n.value, n.lvalue, n.rvalue)
+	}
+	if err := m.mapNodes(); err != nil {
+		return nil, err
+	}
+
+	steps1 := m.SolvePT1(path)
+	steps2 := m.SolvePT2(path)
+
+	return &result{steps1, steps2}, nil
+}
+
+type node struct {
+	value          string
+	lvalue, rvalue string
+	left, right    *node
+}
+
+type nodeMap map[string]*node
+
+func (m nodeMap) mapNodes() error {
+	for k, v := range m {
+		if ptr, ok := m[v.lvalue]; ok {
+			v.left = ptr
+		} else {
+			return fmt.Errorf("%s L-> %s not found", k, v.lvalue)
+		}
+		if ptr, ok := m[v.rvalue]; ok {
+			v.right = ptr
+		} else {
+			return fmt.Errorf("%s R-> %s not found", k, v.rvalue)
+		}
+
+		m[k] = v
+	}
+	return nil
+}
+
+func (m nodeMap) solver(start string, isEnd func(string) bool, path []rune) uint64 {
+	position, ok := m[start]
+	if !ok {
+		return 0
+	}
+	var i int
+	var steps uint64
+
+	for steps < ^uint64(0) {
+		steps++
+		if path[i] == 'R' {
+			// fmt.Println("step", steps, position.value, "R->", position.rvalue)
+			position = position.right
+		} else {
+			// fmt.Println("step", steps, position.value, "L->", position.lvalue)
+			position = position.left
+		}
+
+		if isEnd(position.value) {
+			break
+		}
+
+		i++
+		if i > len(path)-1 {
+			i = 0
+		}
+	}
+	return steps
+}
+
+func (m nodeMap) SolvePT1(path []rune) uint64 {
+	fmt.Println("---- PART 1 BEGIN ----")
+	defer fmt.Println("---- PART 1 END ----")
+
+	return m.solver("AAA", func(s string) bool { return s == "ZZZ" }, path)
+}
+
+func (m nodeMap) SolvePT2(path []rune) uint64 {
+	fmt.Println("---- PART 2 BEGIN ----")
+	defer fmt.Println("---- PART 2 END ----")
+
+	var starts []*node
+
+	for k, n := range m {
+		if strings.HasSuffix(k, "A") {
+			fmt.Println("start", k)
+			starts = append(starts, n)
+		}
+	}
+
+	loops := make([]uint64, len(starts))
+	for i, n := range starts {
+		loops[i] = m.solver(n.value, func(s string) bool { return strings.HasSuffix(s, "Z") }, path)
+	}
+	return aoc.LCM(loops...)
+}
--- a/day08/main_test.go
+++ b/day08/main_test.go
@ -0,0 +1,80 @@
+package main
+
+import (
+	"bufio"
+	"bytes"
+	"testing"
+
+	_ "embed"
+
+	"github.com/matryer/is"
+)
+
+//go:embed example1.txt
+var example1 []byte
+
+//go:embed example2.txt
+var example2 []byte
+
+//go:embed example3.txt
+var example3 []byte
+
+//go:embed input.txt
+var input []byte
+
+func TestExample1(t *testing.T) {
+	is := is.New(t)
+	scan := bufio.NewScanner(bytes.NewReader(example1))
+
+	result, err := run(scan)
+	is.NoErr(err)
+
+	t.Log(result.stepsPT1)
+	is.Equal(result.stepsPT1, uint64(2))
+}
+
+func TestExample2(t *testing.T) {
+	is := is.New(t)
+	scan := bufio.NewScanner(bytes.NewReader(example2))
+
+	result, err := run(scan)
+	is.NoErr(err)
+
+	t.Log(result.stepsPT1)
+	is.Equal(result.stepsPT1, uint64(6))
+}
+
+func TestExample3(t *testing.T) {
+	is := is.New(t)
+	scan := bufio.NewScanner(bytes.NewReader(example3))
+
+	result, err := run(scan)
+	is.NoErr(err)
+
+	t.Log(result.stepsPT2)
+	is.Equal(result.stepsPT2, uint64(6))
+}
+
+func TestInput(t *testing.T) {
+	is := is.New(t)
+	scan := bufio.NewScanner(bytes.NewReader(input))
+
+	result, err := run(scan)
+	is.NoErr(err)
+
+	t.Log("part1 solution", result.stepsPT1)
+	is.Equal(result.stepsPT1, uint64(14429))
+
+	t.Log("part2 solution", result.stepsPT2)
+	is.Equal(result.stepsPT2, uint64(10921547990923))
+}
+
+// first: 14429
+// second: 10921547990923
+
+// Brüt
+// stops 1 steps 13201
+// stops 2 steps 620447
+// stops 3 steps 36606373
+// stops 4 steps 2232988753
+// stops 5 steps 149610246451
--- a/day09/example.txt
+++ b/day09/example.txt
@ -0,0 +1,3 @@
+0 3 6 9 12 15
+1 3 6 10 15 21
+10 13 16 21 30 45
--- a/day09/input.txt
+++ b/day09/input.txt
@ -0,0 +1,200 @@
+28 38 58 115 255 558 1167 2343 4564 8699 16328 30378 56447 105549 199601 381868 735876 1418100 2712150 5115341 9472583
+24 34 56 103 191 343 593 990 1602 2520 3862 5777 8449 12101 16999 23456 31836 42558 56100 73003 93875
+12 30 66 118 187 291 486 901 1807 3760 7885 16402 33536 67001 130303 246169 451478 804146 1392500 2347766 3860393
+11 7 -1 -10 4 101 392 1052 2337 4631 8595 15584 28661 54781 109041 222274 453659 910327 1775963 3349730 6094694
+13 26 56 110 200 360 677 1347 2785 5847 12267 25493 52275 105732 211455 420013 833076 1658291 3323777 6713131 13636877
+24 36 50 68 92 124 166 220 288 372 474 596 740 908 1102 1324 1576 1860 2178 2532 2924
+4 10 18 35 81 207 523 1232 2664 5299 9766 16819 27345 42607 65306 103013 177906 352348 792280 1916515 4732055
+2 4 15 46 115 246 479 915 1841 4022 9326 21995 51143 115539 252570 534754 1099830 2205374 4328183 8346246 15873877
+6 16 41 104 240 508 1016 1959 3670 6684 11815 20246 33632 54216 84958 129677 193206 281560 402117 563812 777344
+10 24 59 127 240 410 649 969 1382 1900 2535 3299 4204 5262 6485 7885 9474 11264 13267 15495 17960
+1 3 19 65 161 334 621 1072 1753 2749 4167 6139 8825 12416 17137 23250 31057 40903 53179 68325 86833
+1 3 14 46 118 256 493 869 1431 2233 3336 4808 6724 9166 12223 15991 20573 26079 32626 40338 49346
+5 20 54 111 200 339 551 863 1338 2203 4189 9270 22068 52271 118490 254073 515553 994838 1837662 3275301 5689494
+11 19 37 74 152 315 630 1176 2019 3189 4728 6991 11599 23863 58350 151043 385257 945993 2232085 5082986 11226568
+-6 -5 -1 6 16 29 45 64 86 111 139 170 204 241 281 324 370 419 471 526 584
+19 44 79 123 175 234 299 369 443 520 599 679 759 838 915 989 1059 1124 1183 1235 1279
+20 26 41 76 144 261 459 824 1572 3189 6707 14297 30581 65483 140200 299218 633600 1324592 2722729 5487182 10824554
+2 13 49 134 316 686 1400 2714 5060 9211 16601 29879 53781 96407 171038 298877 513930 873445 1482345 2550372 4520094
+7 22 55 116 218 381 645 1090 1862 3209 5540 9533 16335 27918 47680 81409 138761 235440 396309 659706 1083288
+23 34 43 54 73 105 151 202 234 223 220 555 2284 8074 23894 62315 149406 340397 757350 1681105 3771572
+-2 9 31 72 157 346 769 1701 3724 8065 17266 36441 75513 153008 302220 580858 1085650 1973817 3493849 6028622 10154597
+17 35 83 175 326 554 878 1305 1800 2233 2292 1349 -1702 -8485 -20570 -37084 -47977 -18173 145725 659887 1980386
+6 19 49 119 273 598 1257 2530 4856 8858 15310 24963 38082 53479 66865 68818 44405 -18660 -94790 -14282 809438
+17 21 22 20 15 7 -4 -18 -35 -55 -78 -104 -133 -165 -200 -238 -279 -323 -370 -420 -473
+8 23 59 139 312 672 1383 2710 5056 9005 15371 25253 40096 61758 92583 135480 194008 272467 375995 510671 683624
+9 16 34 63 103 154 216 289 373 468 574 691 819 958 1108 1269 1441 1624 1818 2023 2239
+8 19 59 140 275 481 794 1315 2308 4381 8817 18206 37692 77458 157694 318613 640892 1287715 2591041 5226414 10560561
+8 21 37 57 82 107 117 88 -4 -163 -339 -377 54 1555 5117 12270 25264 47285 82709 137397 219034
+22 34 44 52 58 62 64 64 62 58 52 44 34 22 8 -8 -26 -46 -68 -92 -118
+28 57 114 220 416 779 1446 2651 4785 8494 14832 25483 43057 71450 116238 185052 287858 437047 647230 934638 1316054
+16 20 24 28 32 36 40 44 48 52 56 60 64 68 72 76 80 84 88 92 96
+28 39 48 62 97 180 347 630 1022 1413 1518 905 -557 -1064 7553 50137 189888 570667 1494764 3559032 7883557
+5 0 3 30 106 262 542 1035 1947 3728 7269 14184 27192 50614 91000 157901 264801 430224 679031 1043922 1567158
+4 21 55 119 239 461 864 1591 2913 5356 9967 18894 36631 72557 145803 294037 588486 1158435 2229571 4181885 7634411
+8 11 15 33 81 182 384 805 1728 3777 8206 17321 35023 67400 123199 213865 352632 551879 817609 1139457 1474069
+6 15 30 69 162 358 754 1560 3223 6658 13679 27799 55705 109973 214073 411584 783020 1476065 2758724 5110417 9373988
+18 26 37 54 84 138 231 382 614 954 1433 2086 2952 4074 5499 7278 9466 12122 15309 19094 23548
+3 -2 -7 -12 -17 -22 -27 -32 -37 -42 -47 -52 -57 -62 -67 -72 -77 -82 -87 -92 -97
+16 32 61 121 242 466 847 1451 2356 3652 5441 7837 10966 14966 19987 26191 33752 42856 53701 66497 81466
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--- a/day09/main.go
+++ b/day09/main.go
@ -0,0 +1,134 @@
+package main
+
+import (
+	"bufio"
+	"cmp"
+	"fmt"
+	"strings"
+
+	aoc "go.sour.is/advent-of-code"
+)
+
+func main() { aoc.MustResult(aoc.Runner(run)) }
+
+type result struct {
+	valuePT1 int
+	valuePT2 int
+}
+
+func (r result) String() string { return fmt.Sprintf("%#v", r) }
+
+var log = aoc.Log
+
+func run(scan *bufio.Scanner) (*result, error) {
+	var histories [][]int
+	var values []int
+	var rvalues []int
+
+	for scan.Scan() {
+		text := scan.Text()
+		if len(text) == 0 {
+			continue
+		}
+		histories = append(histories, aoc.ReadStringToInts(strings.Fields(text)))
+
+		log(last(histories...))
+
+		values = append(values, predictNext(last(histories...)))
+		rvalues = append(rvalues, predictPrev(last(histories...)))
+	}
+
+	log("values", values)
+	log("rvalues", rvalues)
+
+	return &result{valuePT1: sum(values...), valuePT2: sum(rvalues...)}, nil
+}
+
+func predictNext(in []int) int {
+	log(" ---- PREDICT NEXT ----")
+	defer log(" ----------------------")
+
+	history := makeHistory(in)
+
+	aoc.Reverse(history)
+
+	return predict(history, func(a, b int) int { return a + b })
+}
+
+func predictPrev(in []int) int {
+	log(" ---- PREDICT PREV ----")
+	defer log(" ----------------------")
+
+	history := makeHistory(in)
+
+	for i := range history {
+		aoc.Reverse(history[i])
+	}
+	aoc.Reverse(history)
+
+	return predict(history, func(a, b int) int { return b - a })
+}
+
+func predict(history [][]int, diff func(a, b int) int) int {
+	log(" ---- PREDICT ----")
+	defer log(" -----------------")
+
+	for i := range history[1:] {
+		lastHistory, curHistory := last(history[i]...), last(history[i+1]...)
+
+		history[i+1] = append(history[i+1], diff(lastHistory, curHistory))
+		log(lastHistory, curHistory, last(history[i+1]))
+	}
+
+	log("last", last(history...))
+	return last(last(history...)...)
+}
+
+func makeHistory(in []int) [][]int {
+	var history [][]int
+	history = append(history, in)
+
+	for {
+		var diffs []int
+
+		current := history[len(history)-1]
+		for i := range current[1:] {
+			diffs = append(diffs, current[i+1]-current[i])
+		}
+
+		history = append(history, diffs)
+		log(diffs)
+
+		if max(diffs[0], diffs[1:]...) == 0 && min(diffs[0], diffs[1:]...) == 0 {
+			break
+		}
+	}
+	return history
+}
+
+func max[T cmp.Ordered](a T, v ...T) T {
+	for _, b := range v {
+		if b > a {
+			a = b
+		}
+	}
+	return a
+}
+func min[T cmp.Ordered](a T, v ...T) T {
+	for _, b := range v {
+		if b < a {
+			a = b
+		}
+	}
+	return a
+}
+func sum[T cmp.Ordered](v ...T) T {
+	var s T
+	for _, a := range v {
+		s += a
+	}
+	return s
+}
+func last[T any](v ...T) T {
+	return v[len(v)-1]
+}
--- a/day09/main_test.go
+++ b/day09/main_test.go
@ -0,0 +1,44 @@
+package main
+
+import (
+	"bufio"
+	"bytes"
+	_ "embed"
+	"testing"
+
+	"github.com/matryer/is"
+)
+
+//go:embed example.txt
+var example []byte
+
+//go:embed input.txt
+var input []byte
+
+func TestExample(t *testing.T) {
+	is := is.New(t)
+	scan := bufio.NewScanner(bytes.NewReader(example))
+
+	result, err := run(scan)
+	is.NoErr(err)
+
+	t.Log(result)
+	is.Equal(result.valuePT1, int(114))
+
+	is.Equal(result.valuePT2, 2)
+}
+
+func TestInput(t *testing.T) {
+	is := is.New(t)
+	scan := bufio.NewScanner(bytes.NewReader(input))
+
+	result, err := run(scan)
+	is.NoErr(err)
+
+	t.Log(result.valuePT1)
+	is.Equal(result.valuePT1, int(1806615041))
+
+	t.Log(result.valuePT2)
+	is.True(result.valuePT2 < 1806615046) // first attempt
+	is.Equal(result.valuePT2, 1211)
+}
--- a/day10/example1.txt
+++ b/day10/example1.txt
@ -0,0 +1,5 @@
+.....
+.S-7.
+.|.|.
+.L-J.
+.....
--- a/day10/example2.txt
+++ b/day10/example2.txt
@ -0,0 +1,5 @@
+..F7.
+.FJ|.
+SJ.L7
+|F--J
+LJ...
--- a/day10/example3.txt
+++ b/day10/example3.txt
@ -0,0 +1,9 @@
+...........
+.S-------7.
+.|F-----7|.
+.||.....||.
+.||.....||.
+.|L-7.F-J|.
+.|..|.|..|.
+.L--J.L--J.
+...........
--- a/day10/example4.txt
+++ b/day10/example4.txt
@ -0,0 +1,10 @@
+.F----7F7F7F7F-7....
+.|F--7||||||||FJ....
+.||.FJ||||||||L7....
+FJL7L7LJLJ||LJ.L-7..
+L--J.L7...LJS7F-7L7.
+....F-J..F7FJ|L7L7L7
+....L7.F7||L7|.L7L7|
+.....|FJLJ|FJ|F7|.LJ
+....FJL-7.||.||||...
+....L---J.LJ.LJLJ...
--- a/day10/example5.txt
+++ b/day10/example5.txt
@ -0,0 +1,10 @@
+FF7FSF7F7F7F7F7F---7
+L|LJ||||||||||||F--J
+FL-7LJLJ||||||LJL-77
+F--JF--7||LJLJ7F7FJ-
+L---JF-JLJ.||-FJLJJ7
+|F|F-JF---7F7-L7L|7|
+|FFJF7L7F-JF7|JL---7
+7-L-JL7||F7|L7F-7F7|
+L.L7LFJ|||||FJL7||LJ
+L7JLJL-JLJLJL--JLJ.L
--- a/day10/input.txt
+++ b/day10/input.txt
@ -0,0 +1,140 @@
+F---7-FJ.7--FJ7.-.7-|7F.|7FJ77F7J-|--.FLF|.F-7-F7.F.J77|--|7--|7|-J-F--7-F7.F7-F7F7F-|-|-F777L7|-.FLF|-77F7-FJF|JF--F.77J-L7-FF--7.FFF7FF7.7
+|J.F|7F|F7J.J-L-|-|.L7F7JF7-7-LJ|LJ.F7.L|.F|F7FJ7.F7.|F|L7.L7L|-F-|7|L|JFF.F||F777L|-77L-|JF7FJJJLF7LL7|.L77|L7LLLJ.|..LLL7|L7-.-JFFLL-7L-FF
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+.|LLFJLF--J.FL|-J.F77F-77.L|L7F77F7.F|FJ7.FJ7JF7F7|F-J..7JL|..FF---|J-F|JF|||F--7|-FL7.J-J.|LFFJ-7.L7J|.7-|LJJF7L77LL||.FL--JJ|-L-F|7F-JJ|.|
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+7|||L|-||..||-.77LF-F--JFJ|L7L7|F--JFJL--7|L7FJFJL-7F--JF-JL7|7L-JLJ||LLJFJ|F-JL----7|FJLJ||F--JF7|||L7L--J|FJJ-LLJJJ|.L--L7|J.LJF-7FJJLL7||
+.-JLFJF7L7.F|7|-7|LFJF-7|FJFJ-LJL7F7L7.F7LJFLJFJF7FJL7F7L--7LJ77LF--JL-7FJFJL-7F7F7FJ|L-7FJ||F7FJ|||L7L7F--JJ|.FLJ-JF--.LJFLJ|.LF-L|JLL|FJJ-
+FJ7F7JL|JL-LJ-L7FF-L7|FJ|L7|J-|F-J|L7L-JL7L|7.|FJ||F-J|L7F7L-7JFFJF-7F7||FJJF-J||||L7|F-J|FJLJ|L7||L7|FJL7|J7L77.|LF|JF-7F|JL7JFL7||F|F.L-|.
+F-|JJ7.JJ-|F77-LLJJ-LJL-JLLJJJFJF7|FJF---J-||7LJ-LJ|F7L7LJ|F7|F-JFJFJ|||||F-JF7|||L7||L7-||-F-JFJLJ-|||F-J-77|L--L-L|.|-F|.LLJL|.7FF7L7J--F7
+LF-.|FL-F-F|7.LFJ-|.|7|L|7J77|L7|LJL7L---7-7|FJJJ.FLJ|FJ.LLJ||L7FJLL7|||||L-7|LJLJ.||L-J-LJ-L--J7|J-||LJJL7|LF7||.LLL7J-F|-J.7-F--FJL7|F7JLF
+F-.F||..LFJLL7FJ.F|-7-77FL.JFFLLJ-F7|F---J.||7J|.F7.LLJ-7-L7LJ-|L7-LLJLJ|||F|L----7LJ7F7JLL.LJ.LFJ|.LJJL--.|-F7-77.F7J|FL|JF7JF|LJLJFJL-F.FF
+F-F||-7-FLF7JFLJ7F|-JJ.LJJJ|-JJ|JF|LJ|F7LJ-JL77-F7JFJLL7FJ.F7.LL-J7LJJJL||F-JF7F-7L---J|LFJ-.J7JJ7L||..LL-JJ7J|F||FFF.LF.|.|L-LF-JFFLJ-FJ-J|
+L7J||.L-JLLJ--7.FL-7||.F|-L7.|.|-FJF7LJ|..7-LFJ.|L7L-||L|7-|-L.|.|L|.FF7LJL7FJLJJ|F----J.|7L|--7.|.LJ-7..|JF7|L-L-7F--L|FJ7|FLL|FJ7|-7.|-|JL
+FL7F||.||7L-F--|JF-.-F-JLF7J||L..L7||F-J7J.-.|.FL|J-FLF.|J7JFL-|-7.--F|L---JL7LF-JL--7|JF-7L7.L-FJ7|LJ7F77JJ.|JL|.-LL.|L-L-|-7.||.L7-F-7.|JL
+L|7-FLJ--F77|-LJ.|--JJJL.|JLJFJF7-LJLJ-F|7L.FJ-77J..F-|-|J|F7.|LLL-7|LL--7F7FJ.L-7F--J7F7F7-JJ.LJ--FJL|FF-7LF|7.L7FFJ-J|.L.|.LFL7.LJFJFF-|..
+.|..|.|7L.L|J.LL-L-7F7-LFJ|.FF.F7.J.|L--|7.|--7|F7FJJ.|L|-L7|--JF|.|-7F|LLJ|L77LFLJ-J.J-.JJ.|||FJF|J..|-LJF-L|7L|-7L|7L7J-JJ.L-J-||-|-LJ|LLF
+LJ-F---J.F7|77JFL-||-F7||-J-LJ-FJLJF-7|F|F-JFFJ|.F--7-LJ|LFL|-7||JFF-|LF.JL|FJ7FFJL7J-|7L77F|FFJJ|7..LL-J.777F7F|JF-77J|LFFF77FL|LL-|-.LJJJ|
+.|JF|-L|.J7LJJ77|F7|7F--|-|JL7-L7LFFJ-77-J|F-JFJ7JF|J|7|F-|7|-L|||F7.|L7-F|LJJ7-|7.|FLLF7LL-FFJ|.-L--7.LF||F-J.L|F7.L7F7.F7LLJ7J|F|-|J|L|L77
+F-7|L77L..F-J7F---7J7||.|-F.LL7.|F7.JL|F7LF|-FF-LF7|-7-|.L--|...FL|L-JFF-J-.|.7F||JF||.FL7L.7||L7JJ-7FF-7|F|-|-LF--J7L7LL7JL||LF|F--LJ|-FJ|7
+L|L--JJJ-LLJ-FF.JJLLJ7-L7-JLJJ|-.F7..-|LJ.FJ.|J..L7J.L-.--JL|.-FJ-L-LL.|.JJ-FJ.F|JLLJF-7J7JJJ|7JLJ..FL--JJ-77L7.|JLL-JL-L.LL-|7-L|J.LLL-L-|.
--- a/day10/main.go
+++ b/day10/main.go
@ -0,0 +1,331 @@
+package main
+
+import (
+	"bufio"
+	"fmt"
+	"strings"
+
+	aoc "go.sour.is/advent-of-code"
+)
+
+// var log = aoc.Log
+
+func main() { aoc.MustResult(aoc.Runner(run)) }
+
+type result struct {
+	valuePT1 int
+	valuePT2 int
+}
+
+func (r result) String() string { return fmt.Sprintf("%#v", r) }
+
+func run(scan *bufio.Scanner) (*result, error) {
+	m := &Path{s: -1}
+	for scan.Scan() {
+		text := scan.Text()
+		_ = text
+
+		m.readLine(text)
+	}
+	dist := m.buildPath()
+	// log(m)
+
+	r := &Region{List: m.List, w: m.w, l: len(m.m)}
+	count := r.Count()
+
+	return &result{valuePT1: dist, valuePT2: count}, nil
+}
+
+type node struct {
+	value  rune
+	pos    int
+	whence int8
+	left   *node
+}
+
+func (n *node) add(a *node) *node {
+	if a == nil {
+		return n
+	}
+	n.left = a
+	return a
+}
+
+func (n *node) String() string {
+	if n == nil {
+		return "EOL"
+	}
+	return fmt.Sprintf("node %s from %s", string(n.value), enum(n.whence))
+}
+
+type List struct {
+	head *node
+	n    *node
+	p    map[int]*node
+}
+
+func NewList(a *node) *List {
+	lis := &List{
+		head: a,
+		n:    a,
+		p:    make(map[int]*node),
+	}
+	lis.add(a)
+
+	return lis
+}
+func (l *List) add(a *node) {
+	l.n = l.n.add(a)
+	l.p[a.pos] = a
+}
+
+type Path struct {
+	m []rune
+	w int
+	s int
+
+	*List
+}
+
+func (m *Path) String() string {
+	var buf strings.Builder
+	n := m.head
+
+	buf.WriteString(fmt.Sprintf("head %d", len(m.p)))
+	for n != nil {
+		buf.WriteString("\n ")
+		buf.WriteString(n.String())
+		n = n.left
+	}
+	return buf.String()
+}
+func (m *Path) readLine(text string) {
+	if m.w == 0 {
+		m.w = len(text)
+	}
+	if m.s == -1 {
+		if i := strings.IndexRune(text, 'S'); i != -1 {
+			m.s = i + len(m.m)
+		}
+	}
+
+	m.m = append(m.m, []rune(text)...)
+}
+func (m *Path) buildPath() int {
+	m.start()
+	for m.next() {
+	}
+	return (len(m.p) + 1) / 2
+}
+func (m *Path) start() {
+	m.List = NewList(&node{value: 'S', pos: m.s})
+
+	switch {
+	case m.peek(UP) != nil:
+		m.add(m.peek(UP))
+	case m.peek(DN) != nil:
+		m.add(m.peek(DN))
+	case m.peek(LF) != nil:
+		m.add(m.peek(LF))
+	case m.peek(RT) != nil:
+		m.add(m.peek(RT))
+	}
+}
+func (m *Path) next() bool {
+	var n *node
+	switch m.n.value {
+	case '7':
+		if m.n.whence == LF {
+			n = m.peek(DN)
+		} else {
+			n = m.peek(LF)
+		}
+	case '|':
+		if m.n.whence == UP {
+			n = m.peek(DN)
+		} else {
+			n = m.peek(UP)
+		}
+	case 'F':
+		if m.n.whence == RT {
+			n = m.peek(DN)
+		} else {
+			n = m.peek(RT)
+		}
+	case '-':
+		if m.n.whence == LF {
+			n = m.peek(RT)
+		} else {
+			n = m.peek(LF)
+		}
+	case 'J':
+		if m.n.whence == LF {
+			n = m.peek(UP)
+		} else {
+			n = m.peek(LF)
+		}
+	case 'L':
+		if m.n.whence == RT {
+			n = m.peek(UP)
+		} else {
+			n = m.peek(RT)
+		}
+	}
+	if n == nil {
+		return false
+	}
+	if n.value == 'S' {
+		last := n.whence
+		next := m.head.left.whence
+
+		switch last<<4 | next {
+		case UP<<4 | UP, DN<<4 | DN:
+			m.head.value = '|' // UP UP, DN DN
+		case LF<<4 | LF, RT<<4 | RT:
+			m.head.value = '-' // LF LF, RT RT
+
+		case UP<<4 | RT, LF<<4 | DN:
+			m.head.value = 'J' // UP RT, LT DN
+		case UP<<4 | LF, RT<<4 | DN:
+			m.head.value = 'L' // UP RT, RT DN
+
+		case DN<<4 | RT, LF<<4 | UP:
+			m.head.value = '7' // DN LF, LF UP
+		case RT<<4 | UP, DN<<4 | LF:
+			m.head.value = 'F' // DN LF, RT UP
+		}
+
+		return false
+	}
+
+	m.add(n)
+
+	return true
+}
+
+const (
+	ST int8 = iota
+	UP
+	DN
+	LF
+	RT
+)
+
+func enum(e int8) string {
+	switch e {
+	case ST:
+		return "ST"
+	case UP:
+		return "UP"
+	case DN:
+		return "DN"
+	case LF:
+		return "LF"
+	case RT:
+		return "RT"
+	default:
+		return "XX"
+	}
+}
+
+func (m *Path) peek(d int8) *node {
+	switch d {
+	case UP:
+		x, y := toXY(m.n.pos, m.w)
+		if y == 0 {
+			return nil
+		}
+
+		p := fromXY(x, y-1, m.w)
+		r := m.m[p]
+		if any(r, '7', '|', 'F', 'S') {
+			return &node{value: r, whence: DN, pos: p}
+		}
+	case DN:
+		x, y := toXY(m.n.pos, m.w)
+		if y == m.w {
+			return nil
+		}
+
+		p := fromXY(x, y+1, m.w)
+		r := m.m[p]
+		if any(r, 'J', '|', 'L', 'S') {
+			return &node{value: r, whence: UP, pos: p}
+		}
+	case LF:
+		x, y := toXY(m.n.pos, m.w)
+		if x == 0 {
+			return nil
+		}
+
+		p := fromXY(x-1, y, m.w)
+		r := m.m[p]
+		if any(r, 'F', '-', 'L', 'S') {
+			return &node{value: r, whence: RT, pos: p}
+		}
+	case RT:
+		x, y := toXY(m.n.pos, m.w)
+		if x == m.w {
+			return nil
+		}
+		p := fromXY(x+1, y, m.w)
+		r := m.m[p]
+		if any(r, '7', '-', 'J', 'S') {
+			return &node{value: r, whence: LF, pos: p}
+		}
+	}
+	return nil
+}
+
+func fromXY(x, y, w int) int { return y*w + x }
+func toXY(i, w int) (int, int) {
+	return i % w, i / w
+}
+func any[T comparable](n T, stack ...T) bool {
+	var found bool
+	for _, s := range stack {
+		if n == s {
+			found = true
+			break
+		}
+	}
+	return found
+}
+
+type Region struct {
+	*List
+	inLoop bool
+	count  int
+	w      int
+	l      int
+}
+
+func (r *Region) Count() int {
+	for i := 0; i < r.l; i++ {
+		if i%r.w == 0 {
+			r.inLoop = false
+			// fmt.Println(": ", i)
+		}
+
+		a, ok := r.p[i]
+		if ok && any(a.value, '|', '7', 'F', 'X') {
+			r.inLoop = !r.inLoop
+			// fmt.Print(string(a.value))
+			continue
+		}
+
+		if !ok && r.inLoop {
+			// fmt.Print("I")
+			r.count++
+			continue
+		}
+
+		if ok {
+			// fmt.Print(string(a.value))
+			continue
+		}
+		// fmt.Print(".")
+
+	}
+	return r.count
+}
--- a/day10/main_test.go
+++ b/day10/main_test.go
@ -0,0 +1,110 @@
+package main
+
+import (
+	"bufio"
+	"bytes"
+	_ "embed"
+	"testing"
+
+	"github.com/matryer/is"
+)
+
+//go:embed example1.txt
+var example1 []byte
+
+//go:embed example2.txt
+var example2 []byte
+
+//go:embed example3.txt
+var example3 []byte
+
+//go:embed example4.txt
+var example4 []byte
+
+//go:embed example5.txt
+var example5 []byte
+
+//go:embed input.txt
+var input []byte
+
+func TestExample1(t *testing.T) {
+	is := is.New(t)
+	scan := bufio.NewScanner(bytes.NewReader(example1))
+
+	result, err := run(scan)
+	is.NoErr(err)
+
+	// t.Log(result.valuePT1)
+	is.Equal(result.valuePT1, 4)
+}
+
+func TestExample2(t *testing.T) {
+	is := is.New(t)
+	scan := bufio.NewScanner(bytes.NewReader(example2))
+
+	result, err := run(scan)
+	is.NoErr(err)
+
+	// t.Log(result.valuePT1)
+	is.Equal(result.valuePT1, 8)
+}
+
+func TestExample3(t *testing.T) {
+	is := is.New(t)
+	scan := bufio.NewScanner(bytes.NewReader(example3))
+
+	result, err := run(scan)
+	is.NoErr(err)
+
+	// t.Log(result.valuePT1)
+	is.Equal(result.valuePT1, 23)
+
+	// t.Log(result.valuePT2)
+	is.Equal(result.valuePT2, 4)
+}
+
+func TestExample4(t *testing.T) {
+	is := is.New(t)
+	scan := bufio.NewScanner(bytes.NewReader(example4))
+
+	result, err := run(scan)
+	is.NoErr(err)
+
+	// t.Log(result.valuePT1)
+	is.Equal(result.valuePT1, 70)
+
+	// t.Log(result.valuePT2)
+	is.Equal(result.valuePT2, 8)
+}
+
+func TestExample5(t *testing.T) {
+	is := is.New(t)
+	scan := bufio.NewScanner(bytes.NewReader(example5))
+
+	result, err := run(scan)
+	is.NoErr(err)
+
+	// t.Log(result.valuePT1)
+	is.Equal(result.valuePT1, 80)
+
+	// t.Log(result.valuePT2)
+	is.Equal(result.valuePT2, 10)
+}
+
+func TestInput(t *testing.T) {
+	is := is.New(t)
+	scan := bufio.NewScanner(bytes.NewReader(input))
+
+	result, err := run(scan)
+	is.NoErr(err)
+
+	// t.Log(result.valuePT1)
+	is.True(result.valuePT1 != 51)
+	is.Equal(result.valuePT1, 6649)
+
+	t.Log(result.valuePT2)
+	is.True(result.valuePT2 != 0)
+	is.Equal(result.valuePT2, 601)
+}
+
+// first: 51 false
--- a/day11/example.txt
+++ b/day11/example.txt
@ -0,0 +1,10 @@
+...#......
+.......#..
+#.........
+..........
+......#...
+.#........
+.........#
+..........
+.......#..
+#...#.....
--- a/day11/input.txt
+++ b/day11/input.txt
@ -0,0 +1,140 @@
+..............................#.........................#.......................#..............................#.........................#..
+....#.....#...................................#.............................................................................................
+.....................................#..................................#...................................................................
+...................................................#....................................................................#...................
+...............................................................#..................#...............................#.........................
+...............#.......................................#...................................#.....#.......#.........................#........
+............................................................................................................................................
+............................................................................#...............................................................
+.......#.......................#....................#.......................................................................................
+........................#..................#....................................................................#...........................
+..#.......................................................#.........#....................#....................................#.............
+..............#...........................................................#..........................................................#......
+......................................#...........................................#..........................#..............................
+.....................................................#.........#..........................................................................#.
+#.......#....................................#.................................................#............................................
+..............................#.......................................#..............#....................#..........#......................
+....#...................................#...................................................................................................
+....................................................................................................#.......................................
+.....................#...........#...............................................#..................................................#.......
+...............................................#.........#..................................................#..................#............
+..........................................................................#...............#........................#........................
+.................#.......................................................................................................#..................
+......................................................................................#..................#..............................#...
+.............#...................................................................................#..........................................
+#...........................#..........#....................................................................................................
+.........#........................................................................#...............................#.........................
+.....................#.........................#.....................................................#....................#......#..........
+.....................................................................#......................................................................
+................................#.....................................................................................................#.....
+...............#..........................................#.................#................#..............................................
+....................................#...........................#...........................................#...............................
+.......#...................#................#.......................................#..............................#......................#.
+......................#.................................................#................................................#..................
+....................................................#......................................#............#...................................
+.............#........................#..........................................................#.............#............................
+...................#..............................................................#.........................................................
+.........................................................#..................#..........#....................................................
+........................#.....................#..............................................#.........................................#....
+.................................................................#.........................................#...................#............
+...................................................#........#.....................................#......................#..................
+.........#....................#.......#................................................................#............#.......................
+#.............................................................................#.....................................................#.......
+..................#.......#.................................................................................................................
+.............#........................................................#........................#................#..........#..............#.
+.....................................................#......................................................................................
+.......#...............#.................#......................#................#..........................................................
+...................................#.....................................................#............................#.....................
+............................................................................................................................................
+...............................#........................................#.........................#.........................................
+.....#.........#...............................#...................#.....................................................................#..
+............................................................................................................................................
+..........#......................................................................#..........................................................
+.........................................#.............................................#......#...................#...................#.....
+........................#.....#........................................................................#....................................
+...................................................#.....#...................#..............................................................
+....................................................................#...............#....................................#........#.........
+...........................#..............................................................#.................................................
+...#........................................#.........#.......................................................#..............#..............
+..........#....................................................#................#...........................................................
+..................................#..................................................................................#...............#......
+.................#..........................................................................................................................
+............................................................................................................................................
+............................#.............#................................#.........................#.....................#................
+.........#.........................................#............#.........................#............................................#....
+....#................................................................#.........................#..............#.............................
+...................#......................................#.................................................................................
+..............................#......#..............................................#..............#................#.......................
+.............................................................................#..............................................................
+.......#.........................................................................................................................#..........
+..............#............#....................#...................#............#.......#.................................#................
+................................#......................#................................................#.................................#.
+............................................................................................................................................
+.#......................#......................................#...............................................#............................
+........................................................................#............................#......................................
+..................................................#..........................#..........................................#.......#...........
+.........................................#..........................................#....................#..............................#...
+......#...............#.................................#...................................................................................
+....................................#.......................................................................................................
+...............................................................#................#........#.........................#..........#.............
+..#........#.....#..........#...................#...................................................#.......................................
+.......................................#...........................#...........................................#............................
+.............................................................................#..............................................................
+.......................#..................................#............#...............#.......#.....................................#......
+............................................................................................................................................
+............#.....#................................#...........#...................................................#............#...........
+...........................................#..............................................#.................................................
+..................................#..............................................#.....................#....................................
+..................................................................#.........................................................................
+...#..........................#............................................#................................................................
+.......................................................#..........................................#........#........#.......................
+.......................................#.................................................................................#......#...........
+.................................................#..........#.........#.......................#.............................................
+............................................................................................................................................
+....#...........#........................................................................................#.......#...........#..............
+......................#...........#.......#....................#..............#.....#.......................................................
+.........#...............................................................................#..................................................
+..................................................#.........................................................................................
+...................#......................................#...........................................#...........................#......#..
+.............#..........#.....................#....................#........................................................................
+...............................................................................#.....#.....#.................#......#.......................
+...#.........................#...................................................................#........................#.................
+............................................................................................................................................
+.......#.........#..........................................#...............................................................................
+.................................#..............................................................................................#...........
+........................................................................#..............#.......#..................#........................#
+.#...................................#......#......#........................................................................................
+............................................................................................................................................
+.............#................#............................................................#..............#.................................
+......#.....................................................#.......................#................#...............................#......
+...................#..............................................#.......................................................#.................
+....................................#.....................................#.................................................................
+........................................................................................................#.......#...........................
+....#.....................................#...............#...................#...............#.........................................#...
+.....................................................................................#......................................................
+....................................................#...........#......................................................#............#.......
+........................#...................................................................................#...............................
+............................................................................#.....#.........#......................#........................
+...#.....#.....#.......................#....................................................................................................
+............................................................................................................................................
+......................................................................#.....................................................................
+......................................................................................#............#..........................#.............
+.....#.............#.........................................................#................#.............................................
+..............................#..........#............#.....#...........................................................#.............#.....
+........................................................................#................#..................................................
+..................................................................................#.........................................................
+......................#.............#....................#........................................................#.........................
+.................#................................#.............#.............#.............................................................
+............................................................................................................................................
+...#..........................#.............#....................................................#.......#...............#.........#........
+........#...........#.................#..................................................................................................#..
+..............#.................................#.....#..........................................................#..........................
+...........................................................#......#.........................................................................
+............................#..................................................#.....................................#......................
+...................................................#.......................................#................................................
+.#................#................#...............................................#...........................................#.....#......
+.............#....................................................................................................#.........................
+.........................#...........................................#.....#......................#..........#..............................
+........................................#...................#...........................................#...................................
+...#......#............................................................................#....................................................
+...............................................#.......................................................................#....................
--- a/day11/main.go
+++ b/day11/main.go
@ -0,0 +1,197 @@
+package main
+
+import (
+	"bufio"
+	_ "embed"
+	"fmt"
+	"sort"
+	"strings"
+
+	aoc "go.sour.is/advent-of-code"
+)
+
+// var log = aoc.Log
+
+func main() { aoc.MustResult(aoc.Runner(run)) }
+
+type result struct {
+	valuePT1 int
+	valuePT2 int
+}
+
+func (r result) String() string { return fmt.Sprintf("%#v", r) }
+
+func run(scan *bufio.Scanner) (*result, error) {
+	m := NewMap()
+
+	for scan.Scan() {
+		text := scan.Text()
+		m.readLine(text)
+	}
+
+	return &result{
+		valuePT1: m.expand(1).sumPaths(),
+		valuePT2: m.expand(999_999).sumPaths(),
+	}, nil
+}
+
+type Map struct {
+	rows int
+	cols int
+
+	emptyRows map[int]bool
+	emptyCols map[int]bool
+
+	*aoc.List[rune]
+}
+
+func NewMap() *Map {
+	return &Map{
+		emptyRows: make(map[int]bool),
+		emptyCols: make(map[int]bool),
+		List:      aoc.NewList[rune](nil),
+	}
+}
+func (m *Map) String() string {
+	buf := &strings.Builder{}
+	fmt.Fprintf(buf, "Map size %d x %d\n", m.rows, m.cols)
+	fmt.Fprintln(buf, "empty rows:", all(m.emptyRows))
+	fmt.Fprintln(buf, "empty cols:", all(m.emptyCols))
+
+	n := m.Head()
+	for n != nil {
+		fmt.Fprintln(buf, toXY(n.Position(), m.cols), n.String())
+		n = n.Next()
+	}
+
+	for row := 0; row < m.rows; row++ {
+		for col := 0; col < m.cols; col++ {
+			if n := m.getRC(row, col); n != nil {
+				buf.WriteRune('#')
+			} else {
+				buf.WriteRune('.')
+			}
+		}
+		buf.WriteRune('\n')
+	}
+
+	return buf.String()
+}
+
+func (m *Map) readLine(text string) {
+	if m.cols == 0 {
+		m.cols = len(text)
+	}
+
+	emptyRow, ok := m.emptyRows[m.rows]
+	if !ok {
+		emptyRow = true
+	}
+
+	row := []rune(text)
+	for col, r := range row {
+		emptyCol, ok := m.emptyCols[col]
+		if !ok {
+			emptyCol = true
+		}
+
+		if r == '#' {
+			m.Add(r, fromXY(col, m.rows, m.cols))
+			emptyCol = false
+			emptyRow = false
+		}
+
+		m.emptyRows[m.rows] = emptyRow
+		m.emptyCols[col] = emptyCol
+	}
+
+	m.rows++
+}
+func (m *Map) getRC(row, col int) *aoc.Node[rune] {
+	return m.List.Get(fromXY(col, row, m.cols))
+}
+func (m *Map) expand(rate int) *Map {
+	newM := NewMap()
+
+	newM.rows = m.rows + rate*len(all(m.emptyRows))
+	newM.cols = m.cols + rate*len(all(m.emptyCols))
+
+	offsetC := 0
+	for col := 0; col < m.cols; col++ {
+		if empty, ok := m.emptyCols[col]; ok && empty {
+			for r := 0; r <= rate; r++ {
+				newM.emptyCols[offsetC+col+r] = true
+			}
+			offsetC += rate
+			continue
+		}
+	}
+
+	offsetR := 0
+	for row := 0; row < m.rows; row++ {
+		if empty, ok := m.emptyRows[row]; ok && empty {
+			for r := 0; r <= rate; r++ {
+				newM.emptyRows[offsetR+row+r] = true
+			}
+			offsetR += rate
+			continue
+		}
+
+		offsetC := 0
+		for col := 0; col < m.cols; col++ {
+			if empty, ok := m.emptyCols[col]; ok && empty {
+				offsetC += rate
+
+				continue
+			}
+
+			if n := m.getRC(row, col); n != nil {
+				newM.Add('#', fromXY(offsetC+col, offsetR+row, newM.cols))
+			}
+		}
+	}
+
+	return newM
+}
+func (m *Map) sumPaths() int {
+	var positions []int
+
+	n := m.Head()
+	for n != nil {
+		positions = append(positions, n.Position())
+		n = n.Next()
+	}
+
+	var paths []int
+
+	for i := 0; i < len(positions); i++ {
+		p := positions[i]
+		pXY := toXY(p, m.cols)
+
+		for j := i; j < len(positions); j++ {
+			c := positions[j]
+			if c == p {
+				continue
+			}
+
+			cXY := toXY(c, m.cols)
+
+			path := aoc.ABS(cXY[0]-pXY[0]) + aoc.ABS(cXY[1]-pXY[1])
+			paths = append(paths, path)
+		}
+	}
+	return aoc.Sum(paths...)
+}
+
+func all(m map[int]bool) []int {
+	lis := make([]int, 0, len(m))
+	for k, v := range m {
+		if v {
+			lis = append(lis, k)
+		}
+	}
+	sort.Ints(lis)
+	return lis
+}
+func fromXY(x, y, w int) int { return y*w + x }
+func toXY(i, w int) [2]int   { return [2]int{i % w, i / w} }
--- a/day11/main_test.go
+++ b/day11/main_test.go
@ -0,0 +1,41 @@
+package main
+
+import (
+	"bufio"
+	"bytes"
+	"testing"
+
+	_ "embed"
+
+	"github.com/matryer/is"
+)
+
+//go:embed example.txt
+var example []byte
+
+//go:embed input.txt
+var input []byte
+
+func TestExample(t *testing.T) {
+	is := is.New(t)
+	scan := bufio.NewScanner(bytes.NewReader(example))
+
+	result, err := run(scan)
+	is.NoErr(err)
+
+	t.Log(result)
+	is.Equal(result.valuePT1, 374)
+	is.Equal(result.valuePT2, 82000210)
+}
+
+func TestSolution(t *testing.T) {
+	is := is.New(t)
+	scan := bufio.NewScanner(bytes.NewReader(input))
+
+	result, err := run(scan)
+	is.NoErr(err)
+
+	t.Log(result)
+	is.Equal(result.valuePT1, 9627977)
+	is.Equal(result.valuePT2, 644248339497)
+}
--- a/day12/example.txt
+++ b/day12/example.txt
@ -0,0 +1,6 @@
+???.### 1,1,3
+.??..??...?##. 1,1,3
+?#?#?#?#?#?#?#? 1,3,1,6
+????.#...#... 4,1,1
+????.######..#####. 1,6,5
+?###???????? 3,2,1
--- a/day12/input.txt
+++ b/day12/input.txt
--- a/day12/main.go
+++ b/day12/main.go
@ -0,0 +1,187 @@
+package main
+
+import (
+	"bufio"
+	_ "embed"
+	"fmt"
+	"slices"
+	"strings"
+
+	aoc "go.sour.is/advent-of-code"
+)
+
+// var log = aoc.Log
+
+func main() { aoc.MustResult(aoc.Runner(run)) }
+
+type result struct {
+	valuePT1 int
+	valuePT2 int
+}
+
+func (r result) String() string { return fmt.Sprintf("%#v", r) }
+
+func run(scan *bufio.Scanner) (*result, error) {
+	var matches []int
+	var matches2 []int
+
+	for scan.Scan() {
+		text := scan.Text()
+		status, text, ok := strings.Cut(text, " ")
+		if !ok {
+			continue
+		}
+
+		// part 1 - brute force
+		grouping := aoc.SliceMap(aoc.Atoi, strings.Split(text, ",")...)
+		pattern := []rune(status)
+		// sp := spring{pattern: pattern, grouping: grouping, missingNo: countQuestion(pattern)}
+		// matches = append(matches, sp.findMatches())
+		matches = append(matches, countPossible(pattern, grouping))
+
+		// part 2 - NFA
+		b, a := status, text
+		bn, an := "", ""
+		for i := 0; i < 5; i++ {
+			bn, an = bn+b+"?", an+a+","
+		}
+		b, a = strings.TrimSuffix(bn, "?"), strings.TrimSuffix(an, ",")
+		matches2 = append(matches2, countPossible([]rune(b), aoc.SliceMap(aoc.Atoi, strings.Split(a, ",")...)))
+	}
+
+	return &result{valuePT1: aoc.Sum(matches...), valuePT2: aoc.Sum(matches2...)}, nil
+}
+
+type spring struct {
+	pattern   []rune
+	grouping  []int
+	missingNo int
+}
+
+func (s *spring) findMatches() int {
+	matches := 0
+	for _, pattern := range s.genPatterns() {
+		pattern := []rune(pattern)
+		target := make([]rune, len(s.pattern))
+		i := 0
+		for j, r := range s.pattern {
+			if r == '?' {
+				target[j] = pattern[i]
+				i++
+				continue
+			}
+			target[j] = r
+		}
+
+		if slices.Equal(countGroupings(target), s.grouping) {
+			matches++
+		}
+	}
+
+	return matches
+}
+func (s *spring) genPatterns() []string {
+	buf := &strings.Builder{}
+	combinations := aoc.Power2(s.missingNo)
+	lis := make([]string, 0, combinations)
+	for i := 0; i < combinations; i++ {
+		for b := 0; b < s.missingNo; b++ {
+			if i>>b&0b1 == 1 {
+				buf.WriteRune('#')
+			} else {
+				buf.WriteRune('.')
+			}
+		}
+		lis = append(lis, buf.String())
+		buf.Reset()
+	}
+
+	return lis
+}
+func countPossible(s []rune, c []int) int {
+	pos := 0
+
+	cstates := map[state]int{{}: 1} // current state
+	nstates := map[state]int{}      // next state
+
+	for len(cstates) > 0 {
+		for st, num := range cstates {
+			si, ci, cc, expdot := st.springIndex, st.groupIndex, st.continuous, st.expectDot
+
+			// have we reached the end?
+			if si == len(s) {
+				if ci == len(c) {
+					pos += num
+				}
+				continue
+			}
+
+			switch {
+			case (s[si] == '#' || s[si] == '?') && ci < len(c) && !expdot:
+				// we are still looking for broken springs
+				if s[si] == '?' && cc == 0 {
+					// we are not in a run of broken springs, so ? can be working
+					nstates[state{si + 1, ci, cc, expdot}] += num
+				}
+
+				cc++
+
+				if cc == c[ci] {
+					// we've found the full next contiguous section of broken springs
+					ci++
+					cc = 0
+					expdot = true // we only want a working spring next
+				}
+
+				nstates[state{si + 1, ci, cc, expdot}] += num
+
+			case (s[si] == '.' || s[si] == '?') && cc == 0:
+				// we are not in a contiguous run of broken springs
+				expdot = false
+				nstates[state{si + 1, ci, cc, expdot}] += num
+			}
+		}
+
+		// swap and clear previous states
+		cstates, nstates = nstates, cstates
+		clear(nstates)
+	}
+	return pos
+}
+
+type state struct {
+	springIndex int
+	groupIndex  int
+	continuous  int
+	expectDot   bool
+}
+
+func countQuestion(pattern []rune) int {
+	count := 0
+	for _, r := range pattern {
+		if r == '?' {
+			count++
+		}
+	}
+	return count
+}
+func countGroupings(pattern []rune) []int {
+	var groupings []int
+	inGroup := false
+	for _, r := range pattern {
+
+		if r == '#' {
+			if !inGroup {
+				groupings = append(groupings, 0)
+			}
+
+			inGroup = true
+			groupings[len(groupings)-1]++
+
+		}
+		if inGroup && r != '#' {
+			inGroup = false
+		}
+	}
+	return groupings
+}
--- a/day12/main_test.go
+++ b/day12/main_test.go
@ -0,0 +1,70 @@
+package main
+
+import (
+	"bufio"
+	"bytes"
+	"testing"
+
+	_ "embed"
+
+	aoc "go.sour.is/advent-of-code"
+
+	"github.com/matryer/is"
+)
+
+//go:embed example.txt
+var example []byte
+
+//go:embed input.txt
+var input []byte
+
+func TestExample(t *testing.T) {
+	is := is.New(t)
+	scan := bufio.NewScanner(bytes.NewReader(example))
+
+	result, err := run(scan)
+	is.NoErr(err)
+
+	t.Log(result)
+	is.Equal(result.valuePT1, 21)
+	is.Equal(result.valuePT2, 525152)
+}
+
+func TestSolution(t *testing.T) {
+	is := is.New(t)
+	scan := bufio.NewScanner(bytes.NewReader(input))
+
+	result, err := run(scan)
+	is.NoErr(err)
+
+	t.Log(result)
+	is.Equal(result.valuePT1, 8193)
+	is.Equal(result.valuePT2, 45322533163795)
+}
+
+func TestPower2(t *testing.T) {
+	is := is.New(t)
+
+	is.Equal(aoc.Power2(1), 2)
+	is.Equal(aoc.Power2(2), 4)
+	is.Equal(aoc.Power2(3), 8)
+	is.Equal(aoc.Power2(4), 16)
+	is.Equal(aoc.Power2(5), 32)
+	is.Equal(aoc.Power2(6), 64)
+}
+
+func TestCountGroupings(t *testing.T) {
+	is := is.New(t)
+	is.Equal([]int{1, 3, 1}, countGroupings([]rune(".#.###.#")))
+	is.Equal([]int{1, 3, 1}, countGroupings([]rune(".#.###...#.")))
+	is.Equal([]int{1, 3, 1}, countGroupings([]rune("#.###...#.")))
+}
+
+func TestCombination(t *testing.T) {
+	s := spring{
+		pattern:   []rune("???"),
+		grouping:  []int{1},
+		missingNo: 3,
+	}
+	s.findMatches()
+}
--- a/day13/example.txt
+++ b/day13/example.txt
@ -0,0 +1,15 @@
+#.##..##.
+..#.##.#.
+##......#
+##......#
+..#.##.#.
+..##..##.
+#.#.##.#.
+
+#...##..#
+#....#..#
+..##..###
+#####.##.
+#####.##.
+..##..###
+#....#..#
--- a/day13/example00.txt
+++ b/day13/example00.txt
@ -0,0 +1,7 @@
+#.##..##.
+..#.##.#.
+##......#
+##......#
+..#.##.#.
+..##..##.
+#.#.##.#.
--- a/day13/input.txt
+++ b/day13/input.txt
--- a/day13/input07.txt
+++ b/day13/input07.txt
@ -0,0 +1,11 @@
+##.#.##.#
+...#..#..
+.##...#..
+.##...#..
+.#.#..#..
+##.#.##.#
+.#...####
+..#.#..##
+...#...##
+.#....#.#
+.#....#.#
--- a/day13/main.go
+++ b/day13/main.go
@ -0,0 +1,179 @@
+package main
+
+import (
+	"bufio"
+	_ "embed"
+	"fmt"
+	"strings"
+
+	aoc "go.sour.is/advent-of-code"
+)
+
+var log = aoc.Log
+
+func main() { aoc.MustResult(aoc.Runner(run)) }
+
+type result struct {
+	valuePT1 int
+	valuePT2 int
+}
+
+func (r result) String() string { return fmt.Sprintf("%#v", r) }
+
+func run(scan *bufio.Scanner) (*result, error) {
+	maps := []Map{}
+	m := Map{}
+	r := &result{}
+
+	for scan.Scan() {
+		text := scan.Text()
+
+		if text == "" {
+			maps = append(maps, m)
+			m = Map{}
+		} else {
+			m = append(m, []rune(text))
+		}
+	}
+	maps = append(maps, m)
+
+	for _, m := range maps {
+		sum, sum2 := findSmudge(m)
+
+		if sum == -1 || sum2 == -1 {
+			mr := Map(aoc.Transpose(m))
+			Hsum, Hsum2 := findSmudge(mr)
+
+			if sum2 == -1 {
+				sum2 = Hsum2 * 100
+			}
+
+			if sum == -1 {
+				sum = Hsum * 100
+			}
+		}
+
+		r.valuePT1 += sum
+		r.valuePT2 += sum2
+	}
+
+	return r, nil
+}
+
+type Map [][]rune
+
+func (m Map) String() string {
+	var buf strings.Builder
+	for i, row := range m {
+		if i == 0 {
+			fmt.Fprint(&buf, "   ")
+			for j := range row {
+				fmt.Fprintf(&buf, "%d", j)
+			}
+			fmt.Fprint(&buf, "\n")
+		}
+
+		fmt.Fprintf(&buf, "%d ", i)
+		buf.WriteRune(' ')
+		buf.WriteString(string(row))
+		buf.WriteRune('\n')
+	}
+	buf.WriteRune('\n')
+	return buf.String()
+
+}
+
+// func findReflection(m Map) (int, bool) {
+// 	candidates := make(map[int]bool)
+// 	var candidateList []int
+
+// 	for _, row := range m {
+// 		for col := 1; col < len(row); col++ {
+// 			if v, ok := candidates[col]; !ok || v {
+// 				candidates[col], _ = reflects(row[:col], row[col:])
+// 			}
+// 		}
+// 		candidateList = all(candidates)
+// 		if len(candidateList) == 0 {
+// 			return 0, false
+// 		}
+// 	}
+
+// 	if len(candidateList) == 1 {
+// 		return candidateList[0], true
+// 	}
+
+// 	return 0, false
+// }
+
+type level struct {
+	blips  int
+	nequal int
+	fail   bool
+}
+
+func findSmudge(m Map) (int, int) {
+	candidates := make(map[int]level)
+
+	for _, row := range m {
+		for col := 1; col < len(row); col++ {
+			candidate := candidates[col]
+			if candidate.fail {
+				continue
+			}
+
+			eq, bl := reflects(row[:col], row[col:])
+			if !eq {
+				candidate.nequal++
+			}
+			candidate.blips += bl
+
+			if candidate.nequal > 1 || candidate.blips > 1 {
+				candidate.fail = true
+			}
+
+			candidates[col] = candidate
+		}
+	}
+
+	a, b := -1, -1
+	for i, cand := range candidates {
+		if !cand.fail && cand.blips == 1 {
+			b = i
+		}
+		if !cand.fail && cand.blips == 0 {
+			a = i
+		}
+	}
+
+	return a, b
+}
+
+func reflects(a, b []rune) (bool, int) {
+	c := min(len(a), len(b))
+
+	a = append([]rune{}, a...)
+	b = append([]rune{}, b...)
+	aoc.Reverse(a)
+	a = a[:c]
+	b = b[:c]
+
+	blips := 0
+	for i := range a {
+		if a[i] != b[i] {
+			blips++
+		}
+	}
+
+	return blips == 0, blips
+}
+
+func all[T comparable](m map[T]bool) []T {
+	lis := make([]T, 0, len(m))
+	for k, v := range m {
+		if v {
+			lis = append(lis, k)
+		}
+	}
+	return lis
+}
--- a/day13/main_test.go
+++ b/day13/main_test.go
@ -0,0 +1,42 @@
+package main
+
+import (
+	"bufio"
+	"bytes"
+	"testing"
+
+	_ "embed"
+
+	"github.com/matryer/is"
+)
+
+//go:embed example.txt
+var example []byte
+
+//go:embed input.txt
+var input []byte
+
+func TestExample(t *testing.T) {
+	is := is.New(t)
+	scan := bufio.NewScanner(bytes.NewReader(example))
+
+	result, err := run(scan)
+	is.NoErr(err)
+
+	t.Log(result)
+	is.Equal(result.valuePT1, 405)
+	is.Equal(result.valuePT2, 400)
+}
+
+func TestSolution(t *testing.T) {
+	is := is.New(t)
+	scan := bufio.NewScanner(bytes.NewReader(input))
+
+	result, err := run(scan)
+	is.NoErr(err)
+
+	t.Log(result)
+	is.True(result.valuePT1 > 1704) // attempt 1
+	is.Equal(result.valuePT1, 30705)
+	is.Equal(result.valuePT2, 44615)
+}
--- a/day14/example.txt
+++ b/day14/example.txt
@ -0,0 +1,10 @@
+O....#....
+O.OO#....#
+.....##...
+OO.#O....O
+.O.....O#.
+O.#..O.#.#
+..O..#O..O
+.......O..
+#....###..
+#OO..#....
--- a/day14/input.txt
+++ b/day14/input.txt
@ -0,0 +1,100 @@
+...#.O.#.#.O.O....#...O....#..#........OO.O#...O..O#O#.......O.O....O.....#...OO#.O....OOO..OO#..#..
+.##.....#.OOO.OO#...O.......O#..O.##OO.O.......O##....O....#O..O..#.#....#OO..#...O.O#.#...#....#O.O
+O...##.O.O.O.O..#.#.....#O....#..#O..O...O..OO..O...##.......OO#..OOO..#O..#.O#.O......#..#O..O..O.O
+..OO....OOO....O.O..OOO.....O........#...O.O.O.O..O#.O...O..#.#O........O.....#O...##....#...#.#....
+##.O.O#..O..##O.....O.#.....O.O#O.O..#...#...OO.##OOO...OO#...O...O........O.#.O.........#O.#...#.#.
+.#.O.O.....#..O###..O#.#..O....O.O....#...##.O..O.OOO..O.O..O#.O..O....#.#.O..#..##O...O....#O#.....
+.......O...##..O..O##..##...O....###.O.#.#.O......O...O.O......#O.....#..O..O#..##O.O#O##O....O#....
+.#O..#....##.##..O#..#..#..O........OO....#..##.O.#.O.O..OO.O.O#..#O##O......OO...O...OO...#....OO..
+#.....O#......O#.....#..O...#O..OO..OO.#O...O...O.........O...#O...O.....#.....#...#.....O##.O.....O
+OO.O..O...O......#.O......#O....#..#.#...O.O....O.#.O#...O........O......#.#O#.O...O.........#O....O
+O.O..O..#......O.O.OO...OO..##.....OO.....#.O...O.#.#...OO..OO.O.........#O..#.O...O#.#..O..OO.##O..
+..#.......O....#...#....##..O.O......O....O#.O..O..#.#.O#O.O.#...#.##.....O...O.O...O.#...O...O.#...
+.O...#..O.....O.O.....OO.O.O.......O..O..........#...O..O..O......O....#OOO...O#O...#.O#........O...
+.OO#....#.....O...#.###..#..O..O.....#O..#..OO...OOO#.O#..O#O........#..#.O..OOO#O#..O..OO........#.
+..O.....#..#..O.............#..O.O..O#.......#.O.........O.#..OO.O..#..##..O.O#O....OO.O.O.O.....O#.
+........#O..O#OO...#.##O.O....O...O..........##.#O..O......O..O.#...#O.O.OO...#.#OOO.#...O#....#.O.#
+.....O.O...#OO#.OO#......#..O.O..#.OO.......#...#.O.O#.O.#O.O#..#O##..OO...#......#.O....#.....O.#O.
+.O#OOOO...#.#..........O#.#.#.#.O....O..O...O...OOO.O.O.O..OO..O..O#.#...#....#...#O#.OO.O..#.O#....
+OO#OO..#.O.#....#..#.#..#O#.O#O#.#..O.O....#..O...OO..O..#........#.O...O#.#.....#....O.....#.O.....
+.O.....#...OO...#..O..#..O..O##..OO...O....#.O.#............###.O.#..O..O.........O..#.O..O.#OO.#...
+.##O.#.O.#....O..O..#..O.#.O..##O..O......OO...#...O..OO#....O..O#O.##.OO#...O#...#.......O.O#.#OO..
+.OO#O#...O..##.O......O..O.O....O...OOO.O..#...O#.#.O.OOO..#...#.##..OO..................OOOOO...###
+.#..##...####.O#...O........O...#O..O..O....O##O..O..OO..#.....#...O.....OO......OOO.#..O.##OO##...#
+....O#........O##.O...O#..#.O#O...O...O.O........#..#.#.O......O..#.....#.O..#.#..#..#O....O##...#..
+.O..OO.O##..O...O.OO....O.OOO..#O#.O##......O.O#....O#O.O......#.O..#O..#O.........#..OO....#.OO..O.
+.#OO..#OO.###........#...#..#.O..#O.O#O...O.#.....O...#......O.......#.O.#.##.O..#O.O###OOOO...#..O.
+##...OOO.#..........O#...O#.....OO...O#..OO.OO.#.OOO..OO....O..OOO...##O...O.........##O...#.#O.....
+.#....O.....#OO.O.OO..O......#.OO..#O...O..##O.#O....#O.OO..#O.OO...O..O.#..##...O......#O##OO.#.O..
+.#..O....O....#......#.O.##...OO.O.O...O.OO.O....#...#..O....O#O..#...#.#..#...OO......OOO...O..#...
+#.#OO.#....O.#.OO....#........O.O.##...O.#.................OOOO....O..#......O..#.#...O....#.O#OO.#O
+....O.O.......##..O.........OO#O..O.O#.#.#.O....#..OO.O..O#O....O..O.O......O.O.#..O.......O.O..O.O#
+...........#OO...O....#.O.#..#O.O#.....O..O.....O#.....OO.#O...#O.#O.#.....OO.O.O....OO......O#O.O..
+OOOO.OO..O....O.O...O..#.........O#.##OOO#.O..O.O.O......O..#..O..#..#.O..O....O#O.#OO..O.O...O#.##.
+##.O.#O.#OO#..........OO#.OO.#..#.#......#.OO...#.O.O.......O##....O..O..#.#.#O....O..##.#OO.O..O..O
+#O...OO..#.#....##.O#.#...##OO#........O#.O..O#.........O.O.#....O.#.O.......O..OOO......O#O.###.O..
+....O#....#..O...#.#.....O.O#O..#O....O...O.OO#...O..O#.##.O.....O...#..#.O.....O...O#..O.#...#.#O..
+O.OO......#..O...O.O....#...OO..O#.O..OO..#.##.....#....O.O#O#.O....O..#..OOO..O....O.O..#..O.O..O..
+.#..#..##O..O.....O#.#.O.O..O..OO..O.O..OO.##.O...O..O#........O.............#.OO..#......O..#O#OOO.
+.#..##...O.#..OO...O..#..#O#..#..##.O#.#.....#....O.O..O.........#.###...#.O##..O...#.O.OO..........
+........#O.......O...O#.#....#.O#....#..O.....OO........O...#.........##.....O...O#.O...O.O..#OO.O.#
+.#..#.O##..##.O#.#.......OO...OO#...#O#............#.#...#...O...#.O..#O.#.O.........O..OO.O...O.#..
+#.O#OO...OO.O.#...##........#....O.#.O.....##.#.O.O.O.#..O#...O..#......#..O...###O..OO..##..OO.#OOO
+.OO...#O....O##.O...O.#....O...#O.......O.....OO.O...O..#...OO.OO.O#...O##.....O..#.#...#OO......O..
+..O..#...O...##..O...O..OO.O.O.O.....#.....O.....O..#OOO.....OOOO#.#.O..O..#........O.#O#.#O..O.##..
+.....##.....O.....O#...##.OOO....O.O..O.#.#O........OO.....#...##...#.#......#....OO.O.....#O....#.#
+..O.OO#....O..O.#O.#OO#..#.O.##.#..#.OO##....O#...#..O.#..#...#.#....OOOO.#...OOOO..O.........##O.O.
+O.O.#......O#...O..#.......#O.O..OOOO..#....#.#.OO.O..#O......#.#....#...#..O....#O.OO..O.......#.#.
+...O.O....O#......#.O.O....O#.#..#O.#.....#...#...#.O#.........O.OO..O###...O....O.#.O.#.....##..O..
+.#.OO...O#O.....O#....O......OO...OO.OOOOOO##....#..#..#O.#.OO....O#..OO.#O........O#..O.O#.#.......
+#OO#.#.....O#OOO#...O.........#......O#.......O.....O#.#O...O........#....O...O.....#.......##.OOO#.
+..#.O##..#OO..#....#O....#....#..........#O...#...O.#.O.O###O..O..#...#.OO....##..O.O.O.....O..O....
+....OOO#.#......#..O.O......##O.#.O.#.O.OO....#..O.......#.....#O.O...##O###.##.##..#.O.#.O#..#..O#.
+......O#OO......#.#..#.O#OO#O..O#O.O##.......O...O........O......O#.....#..#....#...#.#..O...O##.#O.
+#..OO..O.O.....#O.O.#.#......O......O.#....O.#OO.........#.O.O#..#..#.O..O.#..#...#...O.#..........O
+..O#OOO#.#.....O.....O..##.#..OOO.O..#..O#...##O..OO...#....#..#...#...OO.....##OO#.OO...#.O....#.#.
+#.#O.............#....O#.....O.....O.##O.....#.#.#.....O....O...O...##..O...#........#O..##.#.....##
+.O.....O...#O.#.O#..O#........#.##...O##O..........O##.O......O..#....##....###......O##..##O..#.O#.
+.#...#..#..O.O.............#....O.OO.....OO#O.....OO..OOO#O.O.O.O...#...#.........OO..O#.O...#.##..#
+..O...#O#.......#OO..........OO#..#.....OO#...#OO.O#....OO....O..O..#....#OO......O#O...#......O..O.
+O.......O..O..#O.....O#O.........O##.O#.#.O.O....##....O.#....O....OOO..#O#...#...O.O#.O.....O.O#.O.
+O.#O....O..##....O.........##.OO###....O...O...O..O#O#...#O.O.O....#..O..#..#.O.......###..#....#..O
+.........O..#O...O..OO.....#...O..#O#.....O....#O#....##...#.OOOO.O..O#...O..O.O#.#..O.O..#..#.OO...
+...#.....#..OO.O.#.#.O.....O#...#..O...O..O..#...O..O.O..#...#.###..#..##O.#.#O.......O..##O.O.O#...
+.##O......O....#....O....#O..#.....#.O..O.O.O..#.#O.....O#.O...#.#O.#...#.........O....O....OO..O...
+.OO.O.O.O#O..O##.O...OO.....O..O....O....#..#...O.O...O....O.#.O......#O.#.O#O..O...O.O.#.O..O.#....
+O#..#.#..#..#...#.O...O.###.##.OO.O.#.OOO..O..#O.#.O...OO...O.OOO....#.....#OO.O##.O.#.#O...#.#.....
+.#.....#.........O.#.........#...OO..O.#.O...O##O...#..O.O.OO#....###.OO.....#..........#.#OO...O.O.
+........OO..O.O.#..O.#.......#.#O.OOO...OO.O............O#O#...O...#.O.....#...........O...#..OO.O#O
+..#.#.#...O....#O.......#...#...O###.O.....O.O.OO....#O...OO.O.O........O.O.#O.O....OO.....OO.....#.
+#..OOO#......O.#.O#...#..#..O..O.O.O.#...O#OOO.#...O.#.OO.#O..#....#..#O....O.#.O...O...O#OO...#....
+.....#.....##...O....#..O..O.....O#OO.#O#.....O...O.##.#........O..O........#.#......##......#..#..O
+O..O....O.##..#.#O##.#.....OO....O.##O......#...#..OO.O.....#...#........O..O#O##.O.......#..##O..##
+#.....#O....O...#OOO#..O#.O.....O..OO.#..#.#.O#..O..O#.O###....O......O.#.O..#O.....#.......##O.O..O
+O.O.#..#....O....O.......#.O..O#O#.O..........#O.....#OO.O...#.OO.....#...O....OO....#...O....O.#..O
+..#...OO....OO......O....#..#..........##..##..#.....##...#..#O.....#OO......#........O.....O..O...#
+.OO#...O#.O....#.........OO#...O#..O.#..O.O.O.#O......##.O.......O...O...###.O......O....O...#.OO#..
+..O..O#O.#..O.#O...OOO#O.#.O....O.#......O....#....###....OO......O...#...OO.#....O........O#..#..OO
+#..OO..O......#...##..O#.O........O.O...##.#O...O...#O#.O.O....#.............#.O#.#..O..#..OO#.....#
+#..........O...O##.O#..O..OO..O.....#O.#.O......#......O.O....##.O#OO..O.O..O.O.O..#..O....O..#....O
+.O.O...O.#..O.O....#.#.O.O.##.##..O..#OOOO.###...#O...#...O.....O...#.##.OO..O.#..#.O.#.......O....#
+#....#....OOOOOOO.#...OO....##O.#..#......O..#..........O......##..O..###..#.O....O.......OO......#.
+.O.O..##.O.#O.#...#....O..O.....#..##......O.......O..O#.O##.#........O..#.O.#.O.O..##..###..##.#...
+..OOO..O##..OOOO.O.....OO##..O..O.#....#.....OO......O.OOO#...#O.OO...O.O......O#..O.##....###...#.O
+....O...O.O....#..O#.O.....O.O.#.......O##...O#..OO.O.O##...#.....O#.###....O....#O.........OO..O.O.
+O#.O......##..#.#..............#......#.#.OO#......##O#OO..OOO..##.O##....#..O...#......##O.O##...OO
+...#OO....OO...O#.#..##....OO.#..#O......O#....#.O.....O.#O..OO.#..OO...O#.O#....O.#.OO.O.O#..O.....
+#..O.OO#O...O..O..........#..#.#..#..#O.....#O#..O....#..O...O.#.#O#.#OO.....OOO.#..#.........O...O#
+....O......#..........O...#.....OOOO........#.#OO.O............O...#....O........#....#....#........
+...O.......###...O.O...#O.##O.OOO.........O.###.O.......O....O.O...O.#.....#..#O..#..OO..O.O...O....
+O.O#....##.O.O.....O....#............OO.#O...O..#...##.#.#O#O.#.....O......O....#.OO#.O#....#.....O.
+..O####.O.........O...........OO..OO.#.....O.......#..O#.O....O#...##.......#.#....O..O..O#..##.....
+.#..#......O.##.O.OOO.O.OO....O.......#......#.O...OOOO...O..#..#.O.#......O...O#.#.O.#.O....O....O.
+##....O.O..O..O.#...O##.......O....#...#OOO.O..##.....#....O.......#O..#.#O..O.#.......O..#.O.O#.O##
+...O....O#O.#...#......#..O.O.O.O...O.....O..O.#..#.....O#...OO...#.O.O....#..OOO...#.....OO.OO..O..
+O##.O.##.O#OO...OO...OO..O....OO#O.#O..O.O....OO..........O..#.O.#O#.......O.O..#O#....#..#...#O..#.
+.#.#..........#.......#..OO#....O.#.#.O.....OO.#.O..#.#.O....#..O....#..#..O.#O#O.....#.O.O.#O.O.#O.
+.O.#....##O...#..OOO.#......#...#.O.......OO....#.......#..#.OOO........OO..O..###O##..O.....O##....
+OO##..O#....O.##.......O...#........O.O...#O#.#.OOO....#......#.#O.O.O..O..O...#.#.O.O.OOO.O#O......
+#O...#....OOO.O...#O....O...O..........O..#..O#.O..#O.....#......#.#..#.OO..#....#O#....O...O....##.
+.OOOO......##.#O.#O...#......O..#..O..#.O...O.OO...............#O...O..##..#.#....O...O..O.##..O.O..
--- a/day14/main.go
+++ b/day14/main.go
@ -0,0 +1,157 @@
+package main
+
+import (
+	"bufio"
+	_ "embed"
+	"fmt"
+	"strings"
+
+	aoc "go.sour.is/advent-of-code"
+	"golang.org/x/exp/maps"
+)
+
+// var log = aoc.Log
+
+func main() { aoc.MustResult(aoc.Runner(run)) }
+
+type result struct {
+	valuePT1 int
+	valuePT2 int
+}
+
+func (r result) String() string { return fmt.Sprintf("%#v", r) }
+
+func run(scan *bufio.Scanner) (*result, error) {
+	var maplist []Map
+	var m Map
+
+	for scan.Scan() {
+		text := scan.Text()
+		if len(text) == 0 {
+			maplist = append(maplist, m)
+			m = Map{}
+		}
+
+		m = append(m, []rune(text))
+	}
+	maplist = append(maplist, m)
+
+	score1 := 0
+	for _, m := range maplist {
+		m = aoc.Transpose(reverse(m))
+		m.Sort()
+		score1 += m.Score()
+	}
+
+	score2 := 0
+	type record [5]int
+	var current record
+	memo := make(map[record]int)
+
+	for _, m := range maplist {
+		// fmt.Println(m)
+
+		m = aoc.Transpose(reverse(m))
+
+		for i := 0; i < 1_000_000_000; i++ {
+			m, current = cycle(m)
+
+			v, ok := memo[current]
+			if ok && v > 1 {
+				counts := aoc.Reduce(
+					func(i int, v int, counts [3]int) [3]int {
+						counts[v]++
+						return counts
+					}, [3]int{}, maps.Values(memo)...)
+
+				// fmt.Println(i, counts)
+				i = 1_000_000_000 - (1_000_000_000-counts[0]-counts[1])%counts[2]
+				clear(memo)
+			}
+			memo[current] += 1
+			// fmt.Println(i, current, v)
+		}
+		score2 += m.Score()
+	}
+
+	return &result{valuePT1: score1, valuePT2: score2}, nil
+}
+
+type Map [][]rune
+
+func (m Map) String() string {
+	var buf strings.Builder
+	for _, row := range m {
+		buf.WriteString(string(row))
+		buf.WriteRune('\n')
+	}
+	buf.WriteRune('\n')
+
+	return buf.String()
+}
+func (m *Map) Sort() {
+	if m == nil {
+		return
+	}
+	for _, row := range *m {
+		base := 0
+		for i, r := range row {
+			if r == '#' {
+				base = i + 1
+				continue
+			}
+			if r == 'O' {
+				if base < i {
+					row[base], row[i] = row[i], row[base]
+				}
+				base++
+			}
+		}
+	}
+}
+func (m *Map) Score() int {
+	if m == nil {
+		return 0
+	}
+
+	sum := 0
+	max := len(*m)
+	for _, row := range *m {
+		for i, r := range row {
+			if r == 'O' {
+				sum += max - i
+			}
+		}
+	}
+	return sum
+}
+
+func reverse(m Map) Map {
+	for _, row := range m {
+		aoc.Reverse(row)
+	}
+	return m
+}
+func cycle(m Map) (Map, [5]int) {
+	var current [5]int
+
+	m.Sort()
+	current[0] = m.Score()
+
+	m = aoc.Transpose(reverse(m))
+	m.Sort()
+	current[1] = m.Score()
+
+	m = aoc.Transpose(reverse(m))
+	m.Sort()
+	current[2] = m.Score()
+
+	m = aoc.Transpose(reverse(m))
+	m.Sort()
+	current[3] = m.Score()
+
+	m = aoc.Transpose(reverse(m))
+	current[4] = m.Score()
+
+	return m, current
+}
--- a/day14/main_test.go
+++ b/day14/main_test.go
@ -0,0 +1,46 @@
+package main
+
+import (
+	"bufio"
+	"bytes"
+	"testing"
+
+	_ "embed"
+
+	"github.com/matryer/is"
+)
+
+//go:embed example.txt
+var example []byte
+
+//go:embed input.txt
+var input []byte
+
+func TestExample(t *testing.T) {
+	is := is.New(t)
+	scan := bufio.NewScanner(bytes.NewReader(example))
+
+	result, err := run(scan)
+	is.NoErr(err)
+
+	t.Log(result)
+	is.Equal(result.valuePT1, 136)
+	is.Equal(result.valuePT2, 64)
+}
+
+func TestSolution(t *testing.T) {
+	is := is.New(t)
+	scan := bufio.NewScanner(bytes.NewReader(input))
+
+	result, err := run(scan)
+	is.NoErr(err)
+
+	t.Log(result)
+ is.True(result.valuePT2 < 87286) // first submission
+ is.True(result.valuePT2 < 87292) // second submission
+ is.True(result.valuePT2 < 87287) // third submission
+
+	is.Equal(result.valuePT1, 110407)
+	is.Equal(result.valuePT2, 87273)
+}
+
--- a/day15/example.txt
+++ b/day15/example.txt
@ -0,0 +1 @@
+rn=1,cm-,qp=3,cm=2,qp-,pc=4,ot=9,ab=5,pc-,pc=6,ot=7
--- a/day15/input.txt
+++ b/day15/input.txt
--- a/day15/main.go
+++ b/day15/main.go
@ -0,0 +1,136 @@
+package main
+
+import (
+	"bufio"
+	_ "embed"
+	"fmt"
+	"slices"
+	"strings"
+
+	aoc "go.sour.is/advent-of-code"
+)
+
+var log = aoc.Log
+
+func main() { aoc.MustResult(aoc.Runner(run)) }
+
+type result struct {
+	valuePT1 int
+	valuePT2 int
+}
+
+func (r result) String() string { return fmt.Sprintf("%#v", r) }
+
+func run(scan *bufio.Scanner) (*result, error) {
+	r := &result{}
+
+	var ops []string
+	for scan.Scan() {
+		text := scan.Text()
+		ops = strings.Split(text, ",")
+
+		r.valuePT1 = aoc.Reduce(func(i int, t string, sum int) int {
+			sum += hash(t)
+			return sum
+		}, 0, ops...)
+	}
+
+	var boxen boxes
+
+	boxen = aoc.Reduce(func(i int, op string, b boxes) boxes {
+		return b.Op(op)
+	}, boxen, ops...)
+
+	r.valuePT2 = boxen.Sum()
+
+	log(boxen)
+
+	return r, nil
+}
+
+func hash(s string) int {
+	var sum int
+	for _, a := range s {
+		sum += int(a)
+		sum *= 17
+		sum %= 256
+	}
+
+	return sum
+}
+
+type lens struct {
+	label string
+	value int
+}
+
+func (l lens) String() string {
+	return fmt.Sprintf("[%s %d]", l.label, l.value)
+}
+
+type box []lens
+
+func (lis box) String() string {
+	var buf strings.Builder
+	if len(lis) > 0 {
+		buf.WriteString(lis[0].String())
+	}
+	for _, l := range lis[1:] {
+		buf.WriteString(l.String())
+	}
+	return buf.String()
+}
+
+type boxes [256]box
+
+func (lis boxes) String() string {
+	var buf strings.Builder
+	buf.WriteString("Boxes:\n")
+	for i, b := range lis {
+		if len(b) > 0 {
+			fmt.Fprintf(&buf, "Box %d: %v\n", i, b)
+		}
+	}
+	return buf.String()
+}
+
+func (lis boxes) Op(op string) boxes {
+	if a, _, ok := strings.Cut(op, "-"); ok {
+		i := hash(a)
+
+		pos := slices.IndexFunc(lis[i], func(l lens) bool { return l.label == a })
+
+		if pos >= 0 {
+			lis[i] = append(lis[i][:pos], lis[i][pos+1:]...)
+		}
+	} else if a, b, ok := strings.Cut(op, "="); ok {
+		i := hash(a)
+		v := aoc.Atoi(b)
+
+		pos := slices.IndexFunc(lis[i], func(l lens) bool { return l.label == a })
+
+		if pos == -1 {
+			lis[i] = append(lis[i], lens{a, v})
+		} else {
+			lis[i][pos].value = v
+		}
+	}
+
+	return lis
+}
+func (lis boxes) Sum() int {
+	// return aoc.Reduce(func(b int, box box, sum int) int {
+	// 	return aoc.Reduce(
+	// 		func(s int, lens lens, sum int) int {
+	// 			return sum + (b+1)*(s+1)*lens.value
+	// 		}, sum, box...)
+	// 	}, 0, lis[:]...)
+
+	var sum int
+	for b := range lis {
+		for s := range lis[b] {
+			sum += (b + 1) * (s + 1) * lis[b][s].value
+		}
+	}
+	return sum
+}
--- a/day15/main_test.go
+++ b/day15/main_test.go
@ -0,0 +1,41 @@
+package main
+
+import (
+	"bufio"
+	"bytes"
+	"testing"
+
+	_ "embed"
+
+	"github.com/matryer/is"
+)
+
+//go:embed example.txt
+var example []byte
+
+//go:embed input.txt
+var input []byte
+
+func TestExample(t *testing.T) {
+	is := is.New(t)
+	scan := bufio.NewScanner(bytes.NewReader(example))
+
+	result, err := run(scan)
+	is.NoErr(err)
+
+	t.Log(result)
+	is.Equal(result.valuePT1, 1320)
+	is.Equal(result.valuePT2, 145)
+}
+
+func TestSolution(t *testing.T) {
+	is := is.New(t)
+	scan := bufio.NewScanner(bytes.NewReader(input))
+
+	result, err := run(scan)
+	is.NoErr(err)
+
+	t.Log(result)
+	is.Equal(result.valuePT1, 503154)
+	is.Equal(result.valuePT2, 251353)
+}
--- a/day16/example.txt
+++ b/day16/example.txt
@ -0,0 +1,10 @@
+.|...\....
+|.-.\.....
+.....|-...
+........|.
+..........
+.........\
+..../.\\..
+.-.-/..|..
+.|....-|.\
+..//.|....
--- a/day16/input.txt
+++ b/day16/input.txt
@ -0,0 +1,110 @@
+\.......................\..........................................-..................-.../................-..
+....../.......\...-......-.|...\..............\.................|............././....-........................
+...............-...-........................................\......\..-.............|......-....\....-........
+..\..|.|...........................-.|........................................./.|....|................|......
+|../................|............................................................\........../..\..............
+........\............../................/..........................\...\....|............./....-.........\\...
+.................-...-...................\../........-|.................../......-...........|................
+........-............/...|-............-.....\.|..............-....-../\../..................\...\././........
+........................-|................................................................-........-..........
+-......./.................|.....\.................\.....//............-........./..../....|...................
+....-.............-........-..........-|.......|...../...\...................\.....................|..........
+...|...\.........|.................|.....|....-....\.......\./........................-.../..../.....-........
+....|....-.-..............\.........|.......................-.......-..............\................/.........
+.....|.\...........-.................-.-........../...\............|...............|...|......./.......|...../
+.....\.........................-.../..-./...\...................../......\...-.......|.\........-|............
+............|.....................................-....../....\.............../-...|...\..\................./.
+......-./|....../............|.........\............-../...-......./.\..\....../......|/...\..................
+................................|.......|..-..../.............................../.-..................-..-/..|.
+...............................-......./......................|./...............-............./....../........
+..................../....................\........\...........................-............/.../..............
+.|||......../.................|.................../..\............................-......./..|...|/.-.........
+......-......./\....../.........|....../.......-...............|.\........-............/.../..................
+.....................-.\/|................//.../.........|.|......\.-..|.........|.........\..................
+.........................\/.......|.|............................|........|.............................././..
+.................................|.................\../..|/.................\.................-...-........-/.
+......................-...-.........../...........................\....\......-..-.......\.-....\....|........
+......-......../..............\/..................\..|........-..............|...-...../......|...............
+|.......|.../....|..............//.....................|..........|/......../................|................
+...|.|..................../|..../.-.......-...........|.....|./....\......-......-................|...........
+......\/./.|\..../|.|..|..........-....|...........|.-.|...................-.\.....|....................\.....
+......../.\......................|.....|...........|.........../.......|....|...|.......-......../......\...-.
+...|...-...||......-..|..-...........|.-.................|.................................-..................
+..............-.\.-........|......\..........................................\./.\........../.....|...........
+../\.........|...............|............|.\/.-/.................-....|...-.................-.....|..../.....
+....................../......../..../-.....\........................\..-.\....|....-.........../-.............
+.................................|................|.........|................../|.....|....\\............/.\..
+...///./.....\.................|/.....................\...................-............|................|.....
+............-...........................--........\................/.............-\................\.....-.../
+...............\.........../|............................|.....................\...-...\.....................-
+...\.............|.............|................\............\|...../...|.........................|...........
+..................|......|..........-.-..............\.........................\..............................
+....-................../.........../...|................/...............|./.|.../....\..../......./......//...
+...../....../..............................|...\../..........-..........-........-..//..../...................
+...............-......|......................|./........./............/..-...........|../.....-........-./....
+..\.........................|...-.......\.................|..............-........\....-.............-....|...
+.......|......|....../........\...........|......-........../......-..................../....................\
+.......................|....-..|........./.|.-...............|..\......\.....-.......\...-/....|/.........\...
+\......\..-.....................\..........................\................................../...........\...
+-....-......../............................................................../.\.......|..............|....-..
+........|......................|.............-....\................................./..\.......|..........-...
+...-...............|........./......\...../.......|...|...............\.../...\.../......|.....-.\......\.....
+............./.....|......................|.....................................\...||.................-....|.
+./.....-................/........|./....-......../......./..............\..................................\..
+.../..../\........-..........................|.-/.|..\................\\-.......|......./...||.......|........
+.....-.........................-...............\...........|.............-.\.../.|......-.|......../...-.....-
+......\....................|...../......................|.../......-..|............|......./.../.........|....
+...|...........-....................................../.|............./....|..../........./.....\../..........
+....../.../................\........................\...\....\......\............../|...............\.-.......
+./....\.../.............|............................-.../............../............/...........\...|........
+............................|.................|/..........//.........../..-...............|...................
+.....\......\.................|.....|...\-./...............\................|....../.....-..\........-....-...
+........................./-........\................./........-/.|....-.......\............-/\......|.\...-...
+..../../..|.|...............\.......................................-.........................................
+...........|...................................................-...-......|..................\............../.
+/....|......................................................................|\.../.......-...........-...|....
+......|.-.\......-........|.....-..|.\..............-......./......-|.........................-...............
+............\......................................|........................|.-...............................
+.........-.........../....\./....../.-...-..//.........../.......\\...........................................
+........\......../............./...-......\.../..|..|............................../......../..\..............
+--.........|.....-...|............../...|.......|..............\|............|.........................|.-....
+-\......./..............-....-....\...|.-........\/.\./............-/...\........|-.........../../...\........
+.\|\..............-......-.\...-....\..........................\........|...........-......./.............../.
+..........................|...\..../.../..........\.............-...//...............\..................-.....
+........./..........................\............|-.....|..-...|......../........-...........................\
+.......\.../.....\....../.......|..|...............-......................|....-...................-.|........
+......|.......\.../..............................-..............................|......-.-...................\
+/.....|.......-............/|.....|-......./..../......-........../..|......../.-..\..../....../...|..........
+............/..--..........-............\.......\................\........................../../....|.........
+..|..-................|.|..|................/.......\............-//.......................\..\...............
+.......................-......-..................|....\................-......\.|....\....|..../../|.-........
+........................-..................-...........................-..-................-................|.
+/.\....|.-.................................\..-.....\./.........../-.|..............\..\.....--|/....\........
+.......-..-../..................\..--|..............|...............|\........|...--................|./.\.....
+..........|................-.......|..................................................|...................|...
+-.-..|....-.|........-./...|.-.........\.....\/........-........\........../................./.../........\...
+..................../...|/......................................../............\.|./../................/\|....
+...//.........................\....../..............\../.......-..\....|......................................
+............................./..|./../.........-/..\..........................................................
+......\.....|..................|..................\.....\.-..\...../............................../...........
+..........\...........-..........-.....-....\/................../.................................\.....|..\..
+..../.\...................................\............\...\....|.................|.....................-.....
+...........-...........................\.......|-../.|....|.....|......................-...../................
+.......|.........\..............|....\...-......../...........-.....-..-...........-..................\...\.|.
+...........|.......................|....-..........\............................\.................../.\.......
+..../.................\.......-..|.................../........................|...............\...........-.|.
+............./..|.-\..../.....-............-....|..\......|......../............-.........|................\..
+...................\...\/......\............|......................\....|...................-./-..............
+..-\...........|.................../.....|....|............................-..|............\.............\....
+.|.....\....\........|..................\...............|..-/.........|.-/...........-............-...........
+.....\...../......-............|........./..|............-........................\....-......................
+......\......../........|..............\...-..-...|.......................................................|...
+...................|.................................\.....\...........................|../.|.-......-........
+..................|..............\.....\............|........../....../...............\.........\.............
+..|...........-..../....\.........--...\................../.............-...-....................-..../....|..
+.|...\...................|......-...........-\..........\.....|.....|..........|.........|....|-../...........
+.............\|...................../\...............\....../.......-....\.....................-..............
+.......//.....................\....\......\......\.........|...................../......../.........\......-..
+.\./.........-...-./-.\.............../......|................................\|....\...../....-..............
+.......|......../......../......./.........../...............|............................../..|......../.....
+............./.........|.....-./.........../....-......./|......-................|............................
--- a/day16/main.go
+++ b/day16/main.go
@ -0,0 +1,189 @@
+package main
+
+import (
+	"bufio"
+	_ "embed"
+	"fmt"
+
+	aoc "go.sour.is/advent-of-code"
+)
+
+// var log = aoc.Log
+
+func main() { aoc.MustResult(aoc.Runner(run)) }
+
+type result struct {
+	valuePT1 int
+	valuePT2 int
+}
+
+func (r result) String() string { return fmt.Sprintf("%#v", r) }
+
+func run(scan *bufio.Scanner) (*result, error) {
+	var m Map
+
+	for scan.Scan() {
+		text := scan.Text()
+		m = append(m, []rune(text))
+	}
+
+	rows := len(m)
+	cols := len(m[0])
+
+	options := make([]int, 2*(rows+cols)+2)
+	i := 0
+	for j:=0; j<=rows-1; j++ {
+		options[i+0] = runCycle(m, ray{[2]int{j, -1}, RT})
+		options[i+1] = runCycle(m, ray{[2]int{j, cols}, LF})
+		i+=2
+	}
+	for j:=0; j<=cols-1; j++ {
+		options[i+0] = runCycle(m, ray{[2]int{-1, j}, DN})
+		options[i+1] = runCycle(m, ray{[2]int{rows, j}, UP})
+		i+=2
+	}
+
+	// fmt.Println(options)
+	return &result{valuePT1: options[0], valuePT2: aoc.Max(options[0], options[1:]...)}, nil
+}
+
+type stack[T any] []T
+
+func (s *stack[T]) Push(v T) {
+	if s == nil {
+		panic("nil stack")
+	}
+	*s = append(*s, v)
+}
+func (s *stack[T]) Pop() T {
+	if s == nil || len(*s) == 0 {
+		panic("empty stack")
+	}
+	defer func() { *s = (*s)[:len(*s)-1] }()
+	return (*s)[len(*s)-1]
+}
+
+var (
+	ZERO = [2]int{0, -1}
+
+	UP = [2]int{-1, 0}
+	DN = [2]int{1, 0}
+	LF = [2]int{0, -1}
+	RT = [2]int{0, 1}
+)
+
+type ray struct {
+	pos [2]int
+	dir [2]int
+}
+
+func (r *ray) next() [2]int {
+	r.pos[0] += r.dir[0]
+	r.pos[1] += r.dir[1]
+	return r.pos
+}
+
+type Map [][]rune
+
+func (m *Map) Get(p [2]int) rune {
+	if p[0] < 0 || p[0] >= len((*m)) {
+		return 0
+	}
+	if p[1] < 0 || p[1] >= len((*m)[0]) {
+		return 0
+	}
+
+	return (*m)[p[0]][p[1]]
+}
+
+
+func runCycle(m Map, r ray) int {
+	current := r
+
+	s := stack[ray]{}
+	s.Push(current)
+
+	energized := make(map[[2]int]bool)
+	// energized[current.pos] = true
+
+	cycle := make(map[[4]int]bool)
+
+	for len(s) > 0 {
+		current = s.Pop()
+
+		r := m.Get(current.next())
+		// fmt.Println("pos", current.pos, current.dir, string(r), len(s))
+		if r == 0 {
+			continue
+		}
+		energized[current.pos] = true
+		v := [4]int{
+			current.pos[0],
+			current.pos[1],
+			current.dir[0],
+			current.dir[1],
+		}
+
+		if _, ok := cycle[v]; ok {
+			// fmt.Println("cycle")
+			continue
+		}
+		cycle[v] = true
+
+		switch r {
+		case '|':
+			switch current.dir {
+			case UP, DN:
+				// pass
+			case LF, RT:
+				current.dir = UP
+				s.Push(ray{current.pos, DN})
+			}
+		case '-':
+			switch current.dir {
+			case LF, RT:
+				// pass
+			case UP, DN:
+				current.dir = LF
+				s.Push(ray{current.pos, RT})
+			}
+		case '/':
+			switch current.dir {
+			case UP:
+				current.dir = RT
+			case DN:
+				current.dir = LF
+			case LF:
+				current.dir = DN
+			case RT:
+				current.dir = UP
+			}
+		case '\\':
+			switch current.dir {
+			case UP:
+				current.dir = LF
+			case DN:
+				current.dir = RT
+			case LF:
+				current.dir = UP
+			case RT:
+				current.dir = DN
+			}
+		}
+
+		s.Push(current)
+	}
+
+	// for i := range m {
+	// 	for j := range m[i] {
+	// 		if v := energized[[2]int{i,j}]; v {
+	// 			fmt.Print("#")
+	// 		} else {
+	// 			fmt.Print(".")
+	// 		}
+	// 	}
+	// 	fmt.Println("")
+	// }
+
+	return len(energized)
+}
--- a/day16/main_test.go
+++ b/day16/main_test.go
@ -0,0 +1,50 @@
+package main
+
+import (
+	"bufio"
+	"bytes"
+	"testing"
+
+	_ "embed"
+
+	"github.com/matryer/is"
+)
+
+//go:embed example.txt
+var example []byte
+
+//go:embed input.txt
+var input []byte
+
+func TestExample(t *testing.T) {
+	is := is.New(t)
+	scan := bufio.NewScanner(bytes.NewReader(example))
+
+	result, err := run(scan)
+	is.NoErr(err)
+
+	t.Log(result)
+	is.Equal(result.valuePT1, 46)
+	is.Equal(result.valuePT2, 51)
+}
+
+func TestSolution(t *testing.T) {
+	is := is.New(t)
+	scan := bufio.NewScanner(bytes.NewReader(input))
+
+	result, err := run(scan)
+	is.NoErr(err)
+
+	t.Log(result)
+
+	is.Equal(result.valuePT1, 8098)
+	is.Equal(result.valuePT2, 8335)
+}
+
+func TestStack(t *testing.T) {
+	is := is.New(t)
+
+	s := stack[int]{}
+	s.Push(5)
+	is.Equal(s.Pop(), 5)
+}
--- a/day20/example1.txt
+++ b/day20/example1.txt
@ -0,0 +1,5 @@
+broadcaster -> a, b, c
+%a -> b
+%b -> c
+%c -> inv
+&inv -> a
--- a/day20/example2.txt
+++ b/day20/example2.txt
@ -0,0 +1,5 @@
+broadcaster -> a
+%a -> inv, con
+&inv -> b
+%b -> con
+&con -> output
--- a/day20/input.txt
+++ b/day20/input.txt
@ -0,0 +1,58 @@
+%vg -> lf, vd
+%dr -> kg
+%cn -> mv, pt
+%rq -> bk, gr
+%vp -> lp, bk
+%kg -> lv
+%lv -> jc, tp
+%sj -> rm, vd
+%jc -> tp, qr
+%km -> tp, dr
+%jx -> cn
+&vd -> tf, lf, nb, cx, hx, lr
+%lp -> jt, bk
+%vj -> ps
+broadcaster -> km, lr, xh, rf
+%dj -> pt, gc
+%cg -> vd, hx
+&ln -> tg
+%fl -> pt, sk
+%lm -> tr, bk
+%lr -> vd, vg
+&pt -> vq, rf, cm, jx, rg
+%cx -> gp
+%gp -> vd, sj
+&db -> tg
+%st -> vd
+%jt -> bk
+%jh -> lm, bk
+%xf -> bd, tp
+%gc -> cm, pt
+&tp -> dr, km, kg, db, vj, qr
+%ps -> xf, tp
+%rf -> pt, dj
+%lf -> nb
+%bd -> tp, gg
+%dk -> tp, vj
+%mn -> jh, bk
+&tg -> rx
+%ql -> bk, zx
+%tr -> bk, vp
+%sk -> pt
+%nb -> cg
+%sb -> vd, cx
+%qr -> dk
+%xh -> bk, ql
+%rg -> sd
+%hx -> sb
+%sd -> pt, jx
+%gr -> bk, mn
+%gg -> tp
+%zx -> rq
+&bk -> xh, ln, zx
+%rm -> st, vd
+%hq -> fl, pt
+&vq -> tg
+%cm -> rg
+&tf -> tg
+%mv -> pt, hq
--- a/day20/main.go
+++ b/day20/main.go
@ -0,0 +1,282 @@
+package main
+
+import (
+	"bufio"
+	_ "embed"
+	"fmt"
+	"strings"
+
+	aoc "go.sour.is/advent-of-code"
+	"golang.org/x/exp/maps"
+)
+
+// var log = aoc.Log
+
+func main() { aoc.MustResult(aoc.Runner(run)) }
+
+type result struct {
+	valuePT1 int
+	valuePT2 int
+}
+
+func (r result) String() string { return fmt.Sprintf("%#v", r) }
+
+func run(scan *bufio.Scanner) (*result, error) {
+	m := &machine{}
+	receivers := make(map[string][]string)
+
+	for scan.Scan() {
+		text := scan.Text()
+
+		name, text, _ := strings.Cut(text, " -> ")
+		dest := strings.Split(text, ", ")
+
+		switch {
+		case name == "broadcaster":
+			m.Add(name, &broadcaster{dest: dest})
+		case strings.HasPrefix(name, "%"):
+			name = strings.TrimPrefix(name, "%")
+			m.Add(name, &flipflop{name: name, dest: dest})
+
+		case strings.HasPrefix(name, "&"):
+			name = strings.TrimPrefix(name, "&")
+			m.Add(name, &conjunction{name: name, dest: dest})
+		}
+
+		for _, d := range dest {
+			// rx is present so enable pt 2
+			if d == "rx" {
+				m.Add("rx", &rx{})
+			}
+			receivers[d] = append(receivers[d], name)
+		}
+	}
+
+	m.setup(receivers)
+
+	result := &result{}
+
+	for i := 0; i < 10_000; i++ { // need enough presses to find the best LCM values for each conjunction
+		if i == 1000 {
+			result.valuePT1 = m.highPulses * m.lowPulses
+		}
+		m.Push(i)
+	}
+
+	// rx is present.. perform part 2.
+	if rx, ok := receivers["rx"]; ok {
+		tip := m.m[rx[0]].(*conjunction) // panic if missing!
+
+		var lvalues []int
+		for k, v := range tip.pushes {
+			for i, h := range makeHistory(v) {
+				if i == 1 && len(h) > 0 && h[0] > 0 {
+					fmt.Println(tip.name, k, "frequency", h[0])
+					lvalues = append(lvalues, h[0])
+				}
+			}
+		}
+
+		result.valuePT2 = aoc.LCM(lvalues...)
+		fmt.Println(tip.name, "LCM", result.valuePT2, lvalues)
+	}
+	return result, nil
+}
+
+type signal bool
+
+const (
+	LOW  signal = false
+	HIGH signal = true
+)
+
+type message struct {
+	signal
+	from, to string
+}
+
+type machine struct {
+	m map[string]pulser
+
+	queue []message
+
+	press      int
+	highPulses int
+	lowPulses  int
+}
+
+func (m *machine) Add(name string, p pulser) {
+	if m.m == nil {
+		m.m = make(map[string]pulser)
+	}
+	p.SetMachine(m)
+	m.m[name] = p
+}
+func (m *machine) Send(msgs ...message) {
+	m.queue = append(m.queue, msgs...)
+	for _, msg := range msgs {
+		// fmt.Println(msg)
+		if msg.signal {
+			m.highPulses++
+		} else {
+			m.lowPulses++
+		}
+	}
+}
+func (m *machine) Push(i int) {
+	m.press = i
+	m.Send(generate(LOW, "button", "broadcaster")...)
+	m.processQueue(i)
+}
+func (m *machine) processQueue(i int) {
+	// look for work and process up to the queue length. repeat.
+	hwm := 0
+	for hwm < len(m.queue) {
+		end := len(m.queue)
+
+		for ; hwm < end; hwm++ {
+			msg := m.queue[hwm]
+
+			if p, ok := m.m[msg.to]; ok {
+				// fmt.Println(i, "S:", m.m[msg.from], msg.signal, "R:", p)
+				p.Pulse(msg)
+			}
+		}
+
+		hwm = 0
+		copy(m.queue, m.queue[end:])
+		m.queue = m.queue[:len(m.queue)-end]
+		// fmt.Println("")
+	}
+}
+func (m *machine) setup(receivers map[string][]string) {
+	for name, recv := range receivers {
+		if p, ok := m.m[name]; ok {
+			if p, ok := p.(interface{ Receive(...string) }); ok {
+				p.Receive(recv...)
+			}
+		}
+	}
+}
+
+type pulser interface {
+	Pulse(message)
+	SetMachine(*machine)
+}
+
+// IsModule implements the machine registration for each module.
+type IsModule struct {
+	*machine
+}
+
+func (p *IsModule) SetMachine(m *machine) { p.machine = m }
+
+type broadcaster struct {
+	dest []string
+	IsModule
+}
+
+func (b *broadcaster) Pulse(msg message) {
+	b.Send(generate(msg.signal, "broadcaster", b.dest...)...)
+}
+
+type flipflop struct {
+	name  string
+	state signal
+	dest  []string
+
+	IsModule
+}
+
+func (b *flipflop) Pulse(msg message) {
+	if !msg.signal {
+		b.state = !b.state
+		b.Send(generate(b.state, b.name, b.dest...)...)
+	}
+}
+
+type conjunction struct {
+	name  string
+	state map[string]signal
+	dest  []string
+
+	pushes map[string][]int
+
+	IsModule
+}
+
+func (b *conjunction) Receive(names ...string) {
+	if b.state == nil {
+		b.state = make(map[string]signal)
+		b.pushes = make(map[string][]int)
+	}
+	for _, name := range names {
+		b.state[name] = false
+		b.pushes[name] = []int{}
+	}
+}
+func (b *conjunction) Pulse(msg message) {
+	b.state[msg.from] = msg.signal
+
+	if msg.signal {
+		// collect frequency of pushes to esti,ate rate
+		b.pushes[msg.from] = append(b.pushes[msg.from], b.press)
+	}
+
+	if all(HIGH, maps.Values(b.state)...) {
+		b.Send(generate(LOW, b.name, b.dest...)...)
+		return
+	}
+	b.Send(generate(HIGH, b.name, b.dest...)...)
+}
+
+type rx struct {
+	IsModule
+}
+
+func (rx *rx) Pulse(msg message) {
+	if !msg.signal {
+		panic("pulse received") // will never happen...
+	}
+}
+
+// helper funcs
+func all[T comparable](match T, lis ...T) bool {
+	for _, b := range lis {
+		if b != match {
+			return false
+		}
+	}
+
+	return true
+}
+func generate(t signal, from string, destinations ...string) []message {
+	msgs := make([]message, len(destinations))
+	for i, to := range destinations {
+		msgs[i] = message{signal: t, from: from, to: to}
+	}
+	return msgs
+}
+
+// makeHistory from day 9
+func makeHistory(in []int) [][]int {
+	var history [][]int
+	history = append(history, in)
+
+	// for {
+	var diffs []int
+
+	current := history[len(history)-1]
+
+	for i := range current[1:] {
+		diffs = append(diffs, current[i+1]-current[i])
+	}
+
+	history = append(history, diffs)
+
+	// if len(diffs) == 0 || aoc.Max(diffs[0], diffs[1:]...) == 0 && aoc.Min(diffs[0], diffs[1:]...) == 0 {
+	// 	break
+	// }
+	// }
+	return history
+}
--- a/day20/main_test.go
+++ b/day20/main_test.go
@ -0,0 +1,56 @@
+package main
+
+import (
+	"bufio"
+	"bytes"
+	"testing"
+
+	_ "embed"
+
+	"github.com/matryer/is"
+)
+
+//go:embed example1.txt
+var example1 []byte
+
+//go:embed example2.txt
+var example2 []byte
+
+//go:embed input.txt
+var input []byte
+
+func TestExample1(t *testing.T) {
+	is := is.New(t)
+	scan := bufio.NewScanner(bytes.NewReader(example1))
+
+	result, err := run(scan)
+	is.NoErr(err)
+
+	t.Log(result)
+	is.Equal(result.valuePT1, 32000000)
+	is.Equal(result.valuePT2, 0)
+}
+
+func TestExample2(t *testing.T) {
+	is := is.New(t)
+	scan := bufio.NewScanner(bytes.NewReader(example2))
+
+	result, err := run(scan)
+	is.NoErr(err)
+
+	t.Log(result)
+	is.Equal(result.valuePT1, 11687500)
+	is.Equal(result.valuePT2, 0)
+}
+
+func TestSolution(t *testing.T) {
+	is := is.New(t)
+	scan := bufio.NewScanner(bytes.NewReader(input))
+
+	result, err := run(scan)
+	is.NoErr(err)
+
+	t.Log(result)
+	is.Equal(result.valuePT1, 819397964)
+	is.Equal(result.valuePT2, 252667369442479)
+}
--- a/go.mod
+++ b/go.mod
@ -1,5 +1,10 @@
-module go.sour.is/advent-of-code-2023
+module go.sour.is/advent-of-code

-go 1.21.3
+go 1.21.4

-require github.com/matryer/is v1.4.1
+toolchain go1.21.5
+
+require (
+	github.com/matryer/is v1.4.1
+	golang.org/x/exp v0.0.0-20231214170342-aacd6d4b4611
+)
--- a/go.sum
+++ b/go.sum
@ -1,2 +1,4 @@
 github.com/matryer/is v1.4.1 h1:55ehd8zaGABKLXQUe2awZ99BD/PTc2ls+KV/dXphgEQ=
 github.com/matryer/is v1.4.1/go.mod h1:8I/i5uYgLzgsgEloJE1U6xx5HkBQpAZvepWuujKwMRU=
+golang.org/x/exp v0.0.0-20231214170342-aacd6d4b4611 h1:qCEDpW1G+vcj3Y7Fy52pEM1AWm3abj8WimGYejI3SC4=
+golang.org/x/exp v0.0.0-20231214170342-aacd6d4b4611/go.mod h1:iRJReGqOEeBhDZGkGbynYwcHlctCvnjTYIamk7uXpHI=
--- a/template/example.txt
+++ b/template/example.txt
--- a/template/input.txt
+++ b/template/input.txt
--- a/template/main.go
+++ b/template/main.go
@ -0,0 +1,30 @@
+package main
+
+import (
+	"bufio"
+	_ "embed"
+	"fmt"
+
+	aoc "go.sour.is/advent-of-code"
+)
+
+// var log = aoc.Log
+
+func main() { aoc.MustResult(aoc.Runner(run)) }
+
+type result struct {
+	valuePT1 int
+	valuePT2 int
+}
+
+func (r result) String() string { return fmt.Sprintf("%#v", r) }
+
+func run(scan *bufio.Scanner) (*result, error) {
+
+	for scan.Scan() {
+		_ = scan.Text()
+
+	}
+
+	return &result{}, nil
+}
--- a/template/main_test.go
+++ b/template/main_test.go
@ -0,0 +1,41 @@
+package main
+
+import (
+	"bufio"
+	"bytes"
+	"testing"
+
+	_ "embed"
+
+	"github.com/matryer/is"
+)
+
+//go:embed example.txt
+var example []byte
+
+//go:embed input.txt
+var input []byte
+
+func TestExample(t *testing.T) {
+	is := is.New(t)
+	scan := bufio.NewScanner(bytes.NewReader(example))
+
+	result, err := run(scan)
+	is.NoErr(err)
+
+	t.Log(result)
+	is.Equal(result.valuePT1, 0)
+	is.Equal(result.valuePT2, 0)
+}
+
+func TestSolution(t *testing.T) {
+	is := is.New(t)
+	scan := bufio.NewScanner(bytes.NewReader(input))
+
+	result, err := run(scan)
+	is.NoErr(err)
+
+	t.Log(result)
+	is.Equal(result.valuePT1, 0)
+	is.Equal(result.valuePT2, 0)
+}
--- a/tools.go
+++ b/tools.go
@ -0,0 +1,395 @@
+package aoc
+
+import (
+	"bufio"
+	"cmp"
+	"fmt"
+	"os"
+	"path/filepath"
+	"sort"
+	"strconv"
+	"strings"
+)
+
+func Runner[R any, F func(*bufio.Scanner) (R, error)](run F) (R, error) {
+	if len(os.Args) != 2 {
+		Log("Usage:", filepath.Base(os.Args[0]), "FILE")
+		os.Exit(22)
+	}
+
+	input, err := os.Open(os.Args[1])
+	if err != nil {
+		Log(err)
+		os.Exit(1)
+	}
+
+	scan := bufio.NewScanner(input)
+	return run(scan)
+}
+
+func MustResult[T any](result T, err error) {
+	if err != nil {
+		fmt.Println("ERR", err)
+		os.Exit(1)
+	}
+
+	Log("result", result)
+}
+
+func Log(v ...any) { fmt.Fprintln(os.Stderr, v...) }
+func Logf(format string, v ...any) {
+	if !strings.HasSuffix(format, "\n") {
+		format += "\n"
+	}
+	fmt.Fprintf(os.Stderr, format, v...)
+}
+
+func Reverse[T any](arr []T) []T {
+	for i := 0; i < len(arr)/2; i++ {
+		arr[i], arr[len(arr)-i-1] = arr[len(arr)-i-1], arr[i]
+	}
+	return arr
+}
+
+type uinteger interface {
+	uint | uint8 | uint16 | uint32 | uint64
+}
+type sinteger interface {
+	int | int8 | int16 | int32 | int64
+}
+type integer interface {
+	sinteger | uinteger
+}
+
+// type float interface {
+// 	complex64 | complex128 | float32 | float64
+// }
+// type number interface{ integer | float }
+
+// greatest common divisor (GCD) via Euclidean algorithm
+func GCD[T integer](a, b T) T {
+	for b != 0 {
+		t := b
+		b = a % b
+		a = t
+	}
+	return a
+}
+
+// find Least Common Multiple (LCM) via GCD
+func LCM[T integer](integers ...T) T {
+	if len(integers) == 0 {
+		return 0
+	}
+	if len(integers) == 1 {
+		return integers[0]
+	}
+
+	a, b := integers[0], integers[1]
+	result := a * b / GCD(a, b)
+
+	for _, c := range integers[2:] {
+		result = LCM(result, c)
+	}
+
+	return result
+}
+
+func ReadStringToInts(fields []string) []int {
+	return SliceMap(Atoi, fields...)
+}
+
+type Node[T any] struct {
+	value T
+	pos   int
+	left  *Node[T]
+}
+
+func (n *Node[T]) add(a *Node[T]) *Node[T] {
+	if a == nil {
+		return n
+	}
+
+	if n == nil {
+		return a
+	}
+
+	n.left = a
+	return a
+}
+
+func (n *Node[T]) Value() (value T, ok bool) {
+	if n == nil {
+		return
+	}
+	return n.value, true
+}
+
+func (n *Node[T]) Position() int {
+	if n == nil {
+		return -1
+	}
+	return n.pos
+}
+func (n *Node[T]) SetPosition(i int) {
+	if n == nil {
+		return
+	}
+	n.pos = i
+}
+func (n *Node[T]) Next() *Node[T] {
+	if n == nil {
+		return nil
+	}
+	return n.left
+}
+
+func (n *Node[T]) String() string {
+	if n == nil {
+		return "EOL"
+	}
+	return fmt.Sprintf("node %v", n.value)
+}
+
+type List[T any] struct {
+	head *Node[T]
+	n    *Node[T]
+	p    map[int]*Node[T]
+}
+
+func NewList[T any](a *Node[T]) *List[T] {
+	lis := &List[T]{
+		head: a,
+		n:    a,
+		p:    make(map[int]*Node[T]),
+	}
+	lis.add(a)
+
+	return lis
+}
+func (l *List[T]) Add(value T, pos int) {
+	a := &Node[T]{value: value, pos: pos}
+	l.add(a)
+}
+func (l *List[T]) add(a *Node[T]) {
+	if l.head == nil {
+		l.head = a
+	}
+	if a == nil {
+		return
+	}
+
+	l.n = l.n.add(a)
+	l.p[a.pos] = a
+}
+func (l *List[T]) Get(pos int) *Node[T] {
+	return l.p[pos]
+}
+func (l *List[T]) GetN(pos ...int) []*Node[T] {
+	lis := make([]*Node[T], len(pos))
+	for i, p := range pos {
+		lis[i] = l.p[p]
+	}
+	return lis
+}
+func (l *List[T]) Head() *Node[T] {
+	return l.head
+}
+
+func SliceMap[T, U any](fn func(T) U, in ...T) []U {
+	lis := make([]U, len(in))
+	for i := range lis {
+		lis[i] = fn(in[i])
+	}
+	return lis
+}
+func SliceIMap[T, U any](fn func(int, T) U, in ...T) []U {
+	lis := make([]U, len(in))
+	for i := range lis {
+		lis[i] = fn(i, in[i])
+	}
+	return lis
+}
+
+func Atoi(s string) int {
+	i, _ := strconv.Atoi(s)
+	return i
+}
+
+func Repeat[T any](s T, i int) []T {
+	lis := make([]T, i)
+	for i := range lis {
+		lis[i] = s
+	}
+	return lis
+}
+
+func Sum[T integer](arr ...T) T {
+	var acc T
+	for _, a := range arr {
+		acc += a
+	}
+	return acc
+}
+func SumFunc[T any, U integer](fn func(T) U, input ...T) U {
+	return Sum(SliceMap(fn, input...)...)
+}
+func SumIFunc[T any, U integer](fn func(int, T) U, input ...T) U {
+	return Sum(SliceIMap(fn, input...)...)
+}
+
+func Power2(n int) int {
+	if n == 0 {
+		return 1
+	}
+	p := 2
+	for ; n > 1; n-- {
+		p *= 2
+	}
+	return p
+}
+
+func ABS(i int) int {
+	if i < 0 {
+		return -i
+	}
+	return i
+}
+
+func Transpose[T any](matrix [][]T) [][]T {
+	rows, cols := len(matrix), len(matrix[0])
+
+	m := make([][]T, cols)
+	for i := range m {
+		m[i] = make([]T, rows)
+	}
+
+	for i := 0; i < cols; i++ {
+		for j := 0; j < rows; j++ {
+			m[i][j] = matrix[j][i]
+		}
+	}
+	return m
+}
+
+func Reduce[T, U any](fn func(int, T, U) U, u U, list ...T) U {
+	for i, t := range list {
+		u = fn(i, t, u)
+	}
+	return u
+}
+
+func Max[T cmp.Ordered](a T, v ...T) T {
+	for _, b := range v {
+		if b > a {
+			a = b
+		}
+	}
+	return a
+}
+func Min[T cmp.Ordered](a T, v ...T) T {
+	for _, b := range v {
+		if b < a {
+			a = b
+		}
+	}
+	return a
+}
+
+type PQElem[T any, I integer] struct {
+	Value    T
+	Priority I
+}
+type PQList[T any, I integer] []PQElem[T, I]
+
+func (pq PQList[T, I]) Len() int {
+	return len(pq)
+}
+func (pq PQList[T, I]) Less(i int, j int) bool {
+	return pq[i].Priority < pq[j].Priority
+}
+func (pq PQList[T, I]) Swap(i int, j int) {
+	pq[i], pq[j] = pq[j], pq[i]
+}
+
+var _ sort.Interface = (*PQList[rune, int])(nil)
+
+type PriorityQueue[T any, I integer] struct {
+	elem PQList[T, I]
+}
+
+func (pq *PriorityQueue[T, I]) Enqueue(elem T, priority I) {
+	pq.elem = append(pq.elem, PQElem[T, I]{elem, priority})
+	sort.Sort(pq.elem)
+}
+func (pq *PriorityQueue[T, I]) IsEmpty() bool {
+	return len(pq.elem) == 0
+}
+func (pq *PriorityQueue[T, I]) Dequeue() (T, bool) {
+	var elem T
+	if pq.IsEmpty() {
+		return elem, false
+	}
+
+	elem, pq.elem = pq.elem[0].Value, pq.elem[1:]
+	return elem, true
+}
+
+type Vertex[V comparable, I integer] struct {
+	to    V
+	score I
+}
+type graph[V comparable, I uinteger] struct {
+	adj map[V][]Vertex[V, I]
+}
+
+func Graph[V comparable, I uinteger](size int) *graph[V, I] {
+	return &graph[V, I]{
+		adj: make(map[V][]Vertex[V, I], size),
+	}
+}
+func (g *graph[V, I]) AddEdge(u, v V, w I) {
+	g.adj[u] = append(g.adj[u], Vertex[V, I]{to: v, score: w})
+	g.adj[v] = append(g.adj[v], Vertex[V, I]{to: u, score: w})
+}
+func (g *graph[V, I]) Dijkstra(m interface{Get()}, src V) map[V]I {
+	pq := PriorityQueue[V, I]{}
+	dist := make(map[V]I, len(g.adj))
+	visited := make(map[V]bool, len(g.adj))
+	var INF I
+	INF = ^INF
+
+	pq.Enqueue(src, 0)
+	dist[src] = 0
+
+	for !pq.IsEmpty() {
+		u, _ := pq.Dequeue()
+
+		if _, ok := visited[u]; ok {
+			continue
+		}
+		visited[u] = true
+
+		for _, v := range g.adj[u] {
+			_, ok := visited[v.to]
+			var du, dv I
+			if d, inf := dist[u]; !inf {
+				du = INF
+			} else {
+				du = d
+			}
+			if d, inf := dist[v.to]; !inf {
+				dv = INF
+			} else {
+				dv = d
+			}
+
+			if !ok && du+v.score < dv {
+				dist[v.to] = du + v.score
+				pq.Enqueue(v.to, du+v.score)
+			}
+		}
+	}
+
+	return dist
+}
--- a/tools_test.go
+++ b/tools_test.go
@ -0,0 +1,93 @@
+package aoc_test
+
+import (
+	"testing"
+
+	"github.com/matryer/is"
+	aoc "go.sour.is/advent-of-code"
+)
+
+func TestReverse(t *testing.T) {
+	is := is.New(t)
+
+	is.Equal(aoc.Reverse([]int{1, 2, 3, 4}), []int{4, 3, 2, 1})
+}
+
+func TestLCM(t *testing.T) {
+	is := is.New(t)
+
+	is.Equal(aoc.LCM([]int{}...), 0)
+	is.Equal(aoc.LCM(5), 5)
+	is.Equal(aoc.LCM(5, 3), 15)
+	is.Equal(aoc.LCM(5, 3, 2), 30)
+}
+
+func TestReadStringToInts(t *testing.T) {
+	is := is.New(t)
+
+	is.Equal(aoc.ReadStringToInts([]string{"1", "2", "3"}), []int{1, 2, 3})
+}
+
+func TestRepeat(t *testing.T) {
+	is := is.New(t)
+
+	is.Equal(aoc.Repeat(5, 3), []int{5, 5, 5})
+}
+
+func TestPower2(t *testing.T) {
+	is := is.New(t)
+
+	is.Equal(aoc.Power2(0), 1)
+	is.Equal(aoc.Power2(1), 2)
+	is.Equal(aoc.Power2(2), 4)
+}
+
+func TestABS(t *testing.T) {
+	is := is.New(t)
+
+	is.Equal(aoc.ABS(1), 1)
+	is.Equal(aoc.ABS(0), 0)
+	is.Equal(aoc.ABS(-1), 1)
+}
+
+func TestTranspose(t *testing.T) {
+	is := is.New(t)
+
+	is.Equal(
+		aoc.Transpose(
+			[][]int{
+				{1, 1},
+				{0, 0},
+				{1, 1},
+			},
+		),
+		[][]int{
+			{1, 0, 1},
+			{1, 0, 1},
+		},
+	)
+}
+
+func TestList(t *testing.T) {
+	is := is.New(t)
+
+	lis := aoc.NewList[int](nil)
+	lis.Add(5, 0)
+
+	a, _ := lis.Head().Value()
+
+	is.Equal(a, 5)
+}
+
+func TestGraph(t *testing.T) {
+	g := aoc.Graph[int, uint](7)
+	g.AddEdge(0, 1, 2)
+	g.AddEdge(0, 2, 6)
+	g.AddEdge(1, 3, 5)
+	g.AddEdge(2, 3, 8)
+	g.AddEdge(3, 4, 10)
+	g.AddEdge(3, 5, 15)
+	g.AddEdge(4, 6, 2)
+	g.AddEdge(5, 6, 6)
+	// g.Dijkstra(0)
+}
				`@ -0,0 +1 @@`
				`rn=1,cm-,qp=3,cm=2,qp-,pc=4,ot=9,ab=5,pc-,pc=6,ot=7`