feat: add day 6 2024

Reviewed-on: #23

aoc2024/day03/main.go

@@ -25,7 +25,9 @@ func run(read io.Reader) (*result, error) {
 	sum := 0
 	sum2 := 0
 
-	lexer := Lexer(read)
+	lexer, stop := Lexer(read)
+	defer stop()
+
 	active := true
 
 	for lexer.NextTok() {
@@ -52,7 +54,7 @@ func run(read io.Reader) (*result, error) {
 	return &result{sum, sum2}, nil
 }
 
-func Lexer(in io.Reader) *lexer {
+func Lexer(in io.Reader) (*lexer, func()) {
 	seq := func(yield func(rune) bool) {
 		buf := make([]byte, 256)
 		s, _ := in.Read(buf)
@@ -72,10 +74,10 @@ func Lexer(in io.Reader) *lexer {
 		}
 	}
 	next, stop := iter.Pull(seq)
-	lex := lexer{iter: next, stop: stop}
+	lex := lexer{iter: next}
 	lex.readRune()
 	lex.readRune()
-	return &lex
+	return &lex, stop
 }
 
 type lexer struct {
@@ -83,15 +85,12 @@ type lexer struct {
 	next rune
 
 	iter func() (rune, bool)
-	stop func()
 
 	buf     []rune
 	token   string
 	literal []rune
 }
 
-func (l *lexer) Stop() { l.stop() }
-
 func (l *lexer) readRune() {
 	if l.rune == -1 {
 		return
@@ -172,16 +171,6 @@ func (l *lexer) NextTok() bool {
 	return true
 }
 
-func (l *lexer) Iter() iter.Seq2[string, string] {
-	return func(yield func(string, string) bool) {
-		for l.NextTok() {
-			if !yield(l.token, string(l.literal)) {
-				return
-			}
-		}
-	}
-}
-
 func readMul(lex *lexer) int {
 	if lex.token != "TokMUL" || string(lex.literal) != "mul" {
 		return 0

aoc2024/day04/example.txt

@@ -0,0 +1,10 @@
+MMMSXXMASM
+MSAMXMSMSA
+AMXSXMAAMM
+MSAMASMSMX
+XMASAMXAMM
+XXAMMXXAMA
+SMSMSASXSS
+SAXAMASAAA
+MAMMMXMMMM
+MXMXAXMASX

aoc2024/day04/input.txt

@@ -0,0 +1,140 @@
+XMXXMSSSMSXSXMMXSAMMXXSXMASMSSXXMAMXAMXSXMXSMAMMASXXASMMXMASXMSSXMMMXMXSXXSXMXXSAMXSXSXSAMXMSAMXMAXXXMXMAMSASXMSSXMSXSXXMAXXSSSMXMXMXMMAASXM
+MSSMMAAXAMMSAAAXXAMSXMAMXMSMAMMXSAXMXMASAMASMAMMASXMAMAXXXMASAAAXMSMSMAMAMMAMAMMMMXMASMMXMXAMASXMAMMMMASMMSMMMMASAAXAAMMMMSMXAAMSAMSASMMMMAX
+AAAXMMXMSMASXMMSMXMMASMAAMXMASAMMAXSAMASAMASXXSMASASMSMMMMASMMMMMMAAXMXSAMSAMASMASAMAMASMMMMSAMXMAXAASASAAXAAXMASMMMSMXAAXAAMSMMMAXMAXMAASMM
+SSMMXSAAXMMSAXMAXAAXAMXXMSSSMSMAMAMXAMXXXMXSXMMMMSAMXAXXAMXAXXMAXMASMXASAXXMSAXXASAMAXAMXXAXMXXMSASXMMASMMSSMSMMSASAMXSSSSMSAAAXMMMMXMMSXSXA
+XAAAAMMSMSXXMXAASXSMSMSMXXMAMXMASXSSMMXMAMAMMMAAMMAMMMXSSMSAMXSMSASMXXMSXMAAMAMMMSXMAMMSXSASASAMXASXAMAXMAAAAXXMSXMXMXMXMAXAMXSAXAAXAXAXAMXS
+SXMMSXAXASXAMMMMSXMXMASXMMXMMSMAXXMAMAMXAMASASMSMXAMXMMAMASAMXSXMMXAXSXSAMXMMAMAAMXMASMAXAAMAMSMMXMMMMMSMMMSAMXAXMMMSXSASMMMSMMMSSSMMMMMAMSM
+AAXAXMSMAMSMMAAMSMSAMMMAMAASASMASMSAMAMMASASASXMASMSMSAAMAMAMAMASXMMMAASXMAXSASMMXAXAMMMMMSMXMAXSASASAMXXSMMMSMMMAXAAASAXSAXXAAAMAMXSASMXMAS
+SSMMSMAMSMSXMSMMSASXSXSAMSMMASASMMSASASMXMMXMMXMASAAAXAMMXSAMASMMMAXXMMMXSAMXXSAMSMMSSXXAAAMMSSMSASXMASMXMASAXAMSSMMMMMMMMXSSSMXSAMXSASXMSMS
+XMAMAXMXXAMAMAMAMXMXXASAXAXMXMXASASAMASMSAMXXSSMMMMMMMAMXMSASXMMASMMSSMMMSMMMMMMMASMXAMSMSMSAMXAMAMAXAMMMMAMMMSAAXSASASASXMAMAAXMASXMMMMXSXS
+SMASXSXASASAMAMXSSSSMASXMASMSMSAMXMAMXMASAMSXMAASAMSXXMMXASAMXMSAMAAXXAAAMAMMAAMXAXXMAXMAAXMAXMXMSMSMMMMAXMMSAAMXSMXSASAAMAMSXMMSXXAXAAXMSAS
+XMAXMXAXSAMXXXMAMXAAXMMMXAAAAAXASMSSMXMXMAMXASAMMASMXSXMXMMAMAAMASMMSMSMXSAMXMMSMSSXSXMMSMSSSMXXAMAXMAXSAXMAMXSAMXXXMMMMMASXSMSXXMMMSMMMAMMM
+SMSSSXSAMXMMSMSMXMSMMAAXXSXSMMSAMAMAXXXXSAMSAMASMXMMASAMXXMAMSSSMMAXAXAXXMMXSAMSAMAMXAXXMXAAXXAXMMSMMSAMXSMASAMAASAMSAMXXSMAXAMMXAAMAMXSMSMS
+SAXAMAXAMAAASAAAAMAXMMXMMXMXAMXAMAMMMMMMSSXMAXAMAXAMMMMSAMSMXXMAMXMSXSMSMSAAXAMMAMMMSXMMXMMSMAMSMAMAAXMSAAXAMXSMMAMAAASXMMMMMSMMMSXSASMSAAAA
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+SAAXMMAMAXSSMSAXAMAMMAXMMSMSMMMSMSMMXAMMXAASMMMXMAMASAAAAAASMSAXAAAMMMMMSASMMMMSSMMXAXSMMSAMSAMAMSAMAMAXSXMAMAAXAAAMSXMASXAAMMMMAAMAMXXXAAAA
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+MXMAASMMMAASXMXXAAXMAAAMSSMSXMASAMAMSSMAAXAMMMXXMXMAXAXMAMXMXMXXXMASXSMXMMXAMXMASAXMMAMMMSMMMAMXAXAMMMMAMAMAAXXAMMMXXMMXMXSXSSMMAMMSMXMAMAMM
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+AAXAMXSAMMAAAMASAAAMXXXASASAMMAMAMAMMMMMMSMMMMMMSMASXSASAAAAAXAMMSSMSAAMAMAAXXXMAXMMSXSAMXSAXSAAXAAXMAXAAMMMMAAMASMMMSXXXAAXMAAXXMXMXAAMAMMS
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+XMMAAASAMXXAMMXXAMAXAAMXMAMAASXMAXMASMSMMXSMSXSXSSMMXMSMMSXXAAXMAXMXMMMSMAAAASMXAAMMAMSASXMXMSAMXAXXMSMMASAMXMAXSMSXMSAMXSAMMAAAASASMMMAAMAS
+MMMMMSXMSASMSXSSSMAMSXSAMAMMMSAMXMXASAAMMMMASAMXMAMMMAXAAAMSSSSSMMAAAASAMXSSXMMXSMMSAMMMSASAMXMMMSMMMXAXAMXMSSXSAAXAMXXSAMASMSSSMXAMAASMMMAM
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+MASXSMSXMSMMAXMXMASMMMSSMMMMMMMMSMXAAXMSXAMSMSXXAMXXMMMSMMASAMMXSMMMSAXMASXSSMMXXMASXAMXAMMMSXMMMAXMASMMSSMMXMXXMXXAXAAMASXAMAXMXMMSMMMXAMAS
+MSMAMAMMXXASMSMXSMMXASAMXMXXAASXMMSMMMXMXMXMAMMSMMSMSAMAMMAMASXAXAAAMMMSXMAMMXSXMXMMXSASAMAXMAMSMMMSAMAAAAAMXSMMSASMMMMSMMMMSMSMXSAMXAXMMMAS
+SAMXMXMMAMAMXXMAMAASMMMMSXMSSSSXAASAMSXMXXAMAMAAXMMASXXXSMXXAMMSSSMSSXXMASMXAASMXAAAMXMSASXXSAMXAAAMAMMMMSSMMMASXMAAXAAAXMAXAMAMXMASMMSSSMSS
+AMMASXAMMSMSMSMSSSMXMASAMMMAMAMMMMSAAMAMSMMSSMSMSAMXMSMAMXSMXMMAXXMAMAMXMMXMMXSASMSSXSXSAMAASAMXSMSSMSSSMXXMAXSMAXSMMMSSSSSSSSSSXSAMAXAAAMAS
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+XSMAXMSSMSMMAMMXSMAMMXXXSAMASXSXMXXASMXMMMMMXSSMAAXASMSSMMSSMSAMXXSMAMXMASMXSASXMMMMMMAMAXXXXAMMSMXMMMSMXMAAMXAAMAASXSMMMMMMMMMMMMAAXAXMAMMM
+AMMAMSAAXMASXMXAMMASMMSMMMSXMAXAXAXAMMMSSMAXSMAMSMSAMXXMAXAAXSASMAMMAMASXSAASXSAXXXXSSSMMSSSMMMXMAMXMXAXMMMMMMMMXSXSASAMASAAXAAAAXMASMMMSSSM
+AMAXMMASMXXMASAXMASAAASXAAMASMSXMMMMSXAAASMXXMXMAMMAMMSSMMSSMSAMMSMSXSMSAMMMSSSXMASXXAMXXAAAAASMXAAAMMXSAAAAAXAXXMSMASXMASMSMASXSSMMXAXXAAAS
+SSMSMMMMMXSSXMASMMMSMMMMXMSAMXMAAXAAAMMSMMMXXSMMXMSAMXAASAMXMMSMXXAAAXAMAMAMMASXMMXMXMMMMMSMSMSASMSXSAXMMSSSSSMSAXXMAMAMXMXXAMXXAAXAXMMMMSMM
+XAASASAAXSAMXMASAAXAXMASAXMXSASXMMMSSSXMASMSMAASAAXMASMAMSMXXAAXAMXMMMSMASASMAMMMAXSMXAXAAMMMXMAMAXAXMMXXMAXAAASMMSMXSMMASMMSMSMSMMMMSASAMXS
+MMMSAMMSSMMMXMASMMXMMSAMXMASMAXXAXXAAMXSMAAAMXMMAXXXMMXSSMSMMSSMMAAXMAASASAMMAXAMSSMASASMMSASMMAMXMMMSAMSMSMSMMMMSMXAMAMASMAAXAMMXAAAAAMXSAS
+SMXMAMAMXXXMAMASAMXSAMMSSMMMMAMMSMMXMAMMSMSXSMSSMMSSSMAXAAAXAAAMSSXSASMMMMMSSSSSSMAMXMAAXAXXXAXXXAASAMASXAXAXAAAMASMXSAMMSMSMSMAXASMSSMSXMAS
+SAXSAMXSASMSASASAMXMASAAXAAXMAMAAXMAMSMAXXXAMXAASXXAMMSSMSMSSMSMMAAAMXXAMSMMAAXMAMAMXMXMMMSSSSMSSSXMASXMMSMSMSXMSAMMXSXSXXAAAMXMSMXAMMMXAMAM
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+SMSAXAASMSSMMMAMASMMMSSSSSMSSMSMASXSXMAMMSMSAXSAMAAAAMXXSXAMSAMXMASXSMMSAMAMAMAXASAMXMMXAXAAMXMXMAMSXMAXXAXASMMMSMAMSXMSSSMMAMXMMMSMAMASXMSS
+XAMMSSMSAAMXXMSSMXXXXAAMAXAAAXAMMMMXAMASAMXXMAXAMMXXSMASXMXSAASAMAMMAAMMXMSMMSSMMSSXMSSSMSSMMMSMSAMMXSAMSMMMXAAAASMXMXMMXAMMMMAMAMXMAMMSAAXA
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aoc2024/day04/main.go

@@ -0,0 +1,163 @@
+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
+}
+
+type record struct {
+	p aoc.Point[int]
+	d [2]int
+}
+
+func (r result) String() string { return fmt.Sprintf("%#v", r) }
+
+func run(scan *bufio.Scanner) (*result, error) {
+
+	m := make([][]rune, 0, 1000)
+	var records []record
+	var records2 []record
+
+	for scan.Scan() {
+		txt := scan.Text()
+		m = append(m, []rune(txt))
+	}
+
+	for x, row := range m {
+		for y, c := range row {
+			if c == 'X' {
+				rs := search1(record{
+					p: aoc.Point[int]{x, y},
+				}, m)
+				records = append(records, rs...)
+			}
+
+			if c == 'A' {
+				rs := search2(record{
+					p: aoc.Point[int]{x, y},
+				}, m)
+				if len(rs) == 2 {
+					records2 = append(records2, rs...)
+				}
+			}
+		}
+	}
+
+	for _, r := range records2 {
+		fmt.Println(r)
+	}
+
+
+	return &result{len(records), len(records2)/2}, nil
+}
+
+func search1(r record, m [][]rune) []record {
+	var ds = [][2]int{
+		{1, 0},   // up
+		{0, 1},   // right
+		{-1, 0},  // down
+		{0, -1},  // left
+		{1, 1},   // up-right
+		{1, -1},  // up-left
+		{-1, 1},  // down-right
+		{-1, -1}, // down-left
+	}
+
+	var records []record
+
+	for _, d := range ds {
+		p := r.p
+		if !check1(m, p, d) {
+			continue
+		}
+
+		records = append(records, record{
+			p: p,
+			d: d,
+		})
+	}
+
+	return records
+}
+
+func check1(m [][]rune, p aoc.Point[int], d [2]int) bool {
+	for _, r := range []rune{'M', 'A', 'S'} {
+		p[0] += d[0]
+		p[1] += d[1]
+		if p[0] < 0 || p[0] >= len(m) {
+			return false
+		}
+		if p[1] < 0 || p[1] >= len(m[0]) {
+			return false
+		}
+		if m[p[0]][p[1]] != r {
+			return false
+		}
+	}
+
+	return true
+}
+
+func search2(r record, m [][]rune) []record {
+	var ds = [][2]int{
+		{1, 1},   // up-right
+		{1, -1},  // up-left
+		{-1, 1},  // down-right
+		{-1, -1}, // down-left
+	}
+	var records []record
+
+	for _, d := range ds {
+		p := r.p
+		if !check2(m, p, d) {
+			continue
+		}
+
+		records = append(records, record{
+			p: p,
+			d: d,
+		})
+	}
+
+	return records
+}
+
+func check2(m [][]rune, p aoc.Point[int], d [2]int) bool {
+	p0 := p[0] - d[0]
+	p1 := p[1] - d[1]
+	if p0 < 0 || p0 >= len(m) {
+		return false
+	}
+	if p1 < 0 || p1 >= len(m[0]) {
+		return false
+	}
+	if m[p0][p1] != 'M' {
+		return false
+	}
+
+	p0 = p[0] + d[0]
+	p1 = p[1] + d[1]
+	if p0 < 0 || p0 >= len(m) {
+		return false
+	}
+	if p1 < 0 || p1 >= len(m[0]) {
+		return false
+	}
+	if m[p0][p1] != 'S' {
+		return false
+	}
+
+	return true
+}

aoc2024/day04/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, 18)
+	is.Equal(result.valuePT2, 9)
+}
+
+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, 2536)
+	is.Equal(result.valuePT2, 1875)
+}

aoc2024/day05/example.txt

@@ -0,0 +1,28 @@
+47|53
+97|13
+97|61
+97|47
+75|29
+61|13
+75|53
+29|13
+97|29
+53|29
+61|53
+97|53
+61|29
+47|13
+75|47
+97|75
+47|61
+75|61
+47|29
+75|13
+53|13
+
+75,47,61,53,29
+97,61,53,29,13
+75,29,13
+75,97,47,61,53
+61,13,29
+97,13,75,29,47

aoc2024/day05/main.go

@@ -0,0 +1,83 @@
+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) {
+
+	ordering := make(map[int]aoc.Set[int])
+	var updates [][]int
+
+	for scan.Scan() {
+		txt := scan.Text()
+
+		if txt == "" {
+			break
+		}
+
+		var key, val int
+		_, err := fmt.Sscanf(txt, "%d|%d", &val, &key)
+		if err != nil {
+			return nil, err
+		}
+		if _, ok := ordering[key]; !ok {
+			ordering[key] = aoc.NewSet[int]()
+		}
+		s := ordering[key]
+		s.Add(val)
+	}
+
+	var sum int
+	var sum2 int
+
+outer:
+	for scan.Scan() {
+		txt := scan.Text()
+
+		arr := aoc.SliceMap(aoc.Atoi, strings.Split(txt, ",")...)
+
+		for i, v := range arr {
+			m, ok := ordering[v]
+			if (i > 0 && !ok) || !m.ContainsAll(arr[:i]...) {
+				sort.SliceStable(arr, func(i, j int) bool {
+					if a, ok := ordering[arr[i]]; ok && a.Has(arr[j]) {
+						return true
+					}
+
+					if b, ok := ordering[arr[j]]; ok && b.Has(arr[i]) {
+						return false
+					}
+
+					return false
+				})
+
+				sum2 += arr[len(arr)/2]
+
+				continue outer
+			}
+		}
+
+		sum += arr[len(arr)/2]
+		updates = append(updates, arr)
+	}
+
+	return &result{sum, sum2}, nil
+}

aoc2024/day05/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, 143)
+	is.Equal(result.valuePT2, 123)
+}
+
+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, 7307)
+	is.Equal(result.valuePT2, 4713)
+}

aoc2024/day06/example.txt

@@ -0,0 +1,10 @@
+....#.....
+.........#
+..........
+..#.......
+.......#..
+..........
+.#..^.....
+........#.
+#.........
+......#...

aoc2024/day06/input.txt

@@ -0,0 +1,130 @@
+........#........................................#......#........#................................................................
+....................................#......#.....#............#.............#..........#..........................................
+......................#.......................................................#...................................................
+.......#..#..#....#...#...#....#..............#......#.......#...#................#.......#.......................................
+......................#....##...#.......#....#.......................................#....................#.......................
+...#............................#........................................#..........................#.....................#.......
+....................#............#...............#......#.........#...........#...................................................
+............................#......#...#................#.............#...........................................................
+.....#..#.........#....................#......................................................#........................#.........#
+.........#..##.#.........#.............................................#...........#........#....................##...............
+...............#....#.........................##......#.....................#..............................................#......
+..................##...................................#...........#........#....#.............#..................#........#.#....
+....................................#...................#..............................#............#.............................
+.........#.....#................#..........................................#...................................#..............#...
+...#....................#...................................#..##...................#.......#......................###.........#..
+....................#............#....#.##....#.........#......#...#........................#.......................#..........#..
+..............#...................................................................................#....................#..........
+.........#................#..............................#............................#...#.................#...............#.....
+............................................................................................#...#............................#....
+............#....................#................................#....#...............................#....#.....................
+........................................#.........#..................................................#..#..................#......
+.............#.#............................#..#.....#............................................#....#..........................
+................................................................................................#.........#..#..............#..#..
+...........#..........#.#..#................#.#..#...#.........#..........................................#..........#..#.........
+.............................#....................#.......#....#.....#....#......#....................#..#...............##.......
+..........#..............................................................................#....#.........#..#................#.....
+..#..#...............................................................#.......#........#...........................#...............
+...........................................................................#...##....................#.#....##....................
+.......................................#...............................................#.....................#.........#..........
+.......................................................#.......#....#................#.....................................#......
+.............#................#...................#.................#....................#..................#.#.........#.........
+.....................................................................#.....................................#......................
+........................#..........................................#....#..#.#..........................................#.........
+............#.......#..................#.................................................#..............#.......................#.
+.........................................................#...............#...#....#...........#.................................#.
+.........................#..........................#..#........................................................#.................
+...............#....................................#.......#......................................#............#.................
+.#......................................................................................................#.........................
+#...#........................................................#.................#....#....................#...........#............
+..#.........#................................................................#................................#.............#.....
+..................................#.........................................................................#................#....
+..............#..............................................#........#..................................#........................
+......#............................................#.................................#............................#...............
+.......##..#.......................##............#...#...................#.#..........................................##..........
+.#......#.....................................................................#..#..........................#......#.............#
+.................#.....................#........##..#.........#........#................#.........................................
+...........#.....#..........#........#............................................................................................
+.........................#......#.......................................#..............................#..........................
+............#............................................................#..............#..............................#..........
+..................#.........#...........................................................................................#.........
+#.#..................................#....................#......................#.............#.................................#
+....#................#.................#...................#...........#......................................#...................
+................#........................................................................................#....#.#.......#.....##..
+..........#...#.......................................#........#.......................................#...#......................
+.......#..##........................#......##.........................#.........#.......#.............................#.....#.....
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+...............................#............#....................................#......#......................................#..
+.#..#..................#............................................#....#............#...............##...#..........#...........
+....#.............................................................................................................................
+.............................................................#...........................#..........#.............................
+.#........#..................#.....#.............#.....................................................#...#........#...........#.
+.......................#........................................#.....#............................#.#..................#.........
+................#....#................#.......#............................#.......#.................#............................
+....#.........#....#........#.....................#........................#............#.........................................
+.......#.......#.....................................................................##...........#...............................
+...........#.........................................................#..........#............#....................................
+..................#.............................#.......................................................................#.........
+................#.....#........#.....#...#..........#.....................................#.....#........................#........
+..........................................#.........#...........#.................................................................
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+.........................#..#...............#............................#.............#..........................#..............#

aoc2024/day06/main.go

@@ -0,0 +1,147 @@
+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 start aoc.Point[int]
+	var m [][]rune
+
+	for scan.Scan() {
+		txt := scan.Text()
+
+		if txt == "" {
+			continue
+		}
+
+		m = append(m, []rune(txt))
+
+		for i, c := range txt {
+			if c == '^' {
+				start = aoc.Point[int]{len(m) - 1, i}
+			}
+		}
+	}
+
+	sum, positions, _ := runPT1(m, start)
+
+	loops := runPT2(m, start, positions)
+
+	return &result{sum, loops}, nil
+}
+
+func isOutOfBounds(p, topRight, bottomLeft aoc.Point[int]) bool {
+	return p[0] < topRight[0] ||
+		p[0] > bottomLeft[0] ||
+		p[1] < topRight[1] ||
+		p[1] > bottomLeft[1]
+}
+
+func printMap(m [][]rune, o aoc.Point[int]) {
+	for i, row := range m {
+		if i == o[0] {
+			row[o[1]] = 'O'
+		} 
+		println(string(row))
+	}
+	println()
+}
+
+func runPT1(m [][]rune, start aoc.Point[int]) (int, []aoc.Point[int], bool) {
+	m = copyMap(m)
+
+	topRight := aoc.Point[int]{0, 0}
+	bottomLeft := aoc.Point[int]{len(m) - 1, len(m[0]) - 1}
+
+	directions := []aoc.Point[int]{
+		{-1, 0}, // up
+		{0, 1},  // right
+		{1, 0},  // down
+		{0, -1}, // left
+	}
+
+	d := 0
+	current := start
+	var loopStart [3]int
+	var paths = aoc.NewSet[[3]int]()
+	for !isOutOfBounds(current, topRight, bottomLeft) {
+		m[current[0]][current[1]] = 'X'
+		next := current.Add(directions[d])
+		if isOutOfBounds(next, topRight, bottomLeft) {
+			break
+		}
+		if m[next[0]][next[1]] == '#' {
+			d = (d + 1) % 4
+			pt := [3]int{current[0], current[1], d}
+			if paths.Has(pt) {
+				if loopStart == pt {
+					return 0, nil, true
+				}
+				if loopStart == [3]int{} {
+					loopStart = pt					
+				}
+			}
+
+			paths.Add(pt)
+			continue
+		}
+		
+		current = next
+	}
+
+	var sum int
+	var points []aoc.Point[int]
+	for y, row := range m {
+		for x, v := range row {
+			if v == 'X' {
+				points = append(points, aoc.Point[int]{x, y})
+				sum++
+			}
+		}
+	}
+
+	return sum, points, false
+}
+
+func runPT2(m [][]rune, start aoc.Point[int], points []aoc.Point[int]) int {
+	sum := 0
+	for _, p := range points {
+		cm := copyMap(m)
+		cm[p[0]][p[1]] = '#'
+
+		_, _, isOOB :=runPT1(cm, start)
+
+		if !isOOB {
+			printMap(cm, start)
+			sum++
+		}
+	}
+
+	return sum
+}
+
+func copyMap(m [][]rune) [][]rune {
+	newM := make([][]rune, len(m))
+	for i, row := range m {
+		newM[i] = make([]rune, len(row))
+		copy(newM[i], row)
+	}
+	return newM
+}

aoc2024/day06/main_test.go

@@ -0,0 +1,43 @@
+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, 41)
+	is.Equal(result.valuePT2, 6)
+}
+
+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, 5329)
+	is.True(result.valuePT2 > 897)
+	is.Equal(result.valuePT2, 0)
+}
+

grids_test.go

@@ -73,3 +73,17 @@ func toList[T any](seq iter.Seq[T]) []T {
 	}
 	return list
 }
+
+func TestGraphBFS2(t *testing.T) {
+	is := is.New(t)
+
+	var adjacencyList = map[int][]int{
+		1: {2, 3},
+		2: {4},
+		3: {5, 6},
+	}
+
+	g := aoc.Graph(aoc.WithAdjacencyList[int](adjacencyList))
+	is.Equal(toList(g.BFS(1)), []int{1, 2, 3, 4, 5, 6})
+
+}

set.go

@@ -23,6 +23,15 @@ func (m *Set[T]) Has(a T) bool {
 	return ok
 }
 
+func (m *Set[T]) ContainsAll(other ...T) bool {
+	for _, a := range other {
+		if !m.Has(a) {
+			return false
+		}
+	}
+	return true
+}
+
 type defaultMap[K comparable, V any] struct {
 	m map[K]V
 	d V