chore: save hacker rank

Reviewed-on: #18

.gitea/workflows/test.yml

@@ -28,6 +28,6 @@ jobs:
         go-version: 1.21.3
 
     - name: Test
-      run: go test --race -cover ./...
+      run: go test -timeout 240s -race -cover ./...
 
     - run: echo "🍏 This job's status is ${{ job.status }}."

README.md.sig

@@ -0,0 +1,6 @@
+-----BEGIN SSH SIGNATURE-----
+U1NIU0lHAAAAAQAAADMAAAALc3NoLWVkMjU1MTkAAAAgZ+OuJYdd3UiUbyBuO1RlsQR20a
+Qm5mKneuMxRjGo3zkAAAAEZmlsZQAAAAAAAAAGc2hhNTEyAAAAUwAAAAtzc2gtZWQyNTUx
+OQAAAED8T4C6WILXYZ1KxqDIlVhlrAEjr1Vc+tn8ypcVM3bN7iOexVvuUuvm90nr8eEwKU
+acrdDxmq2S+oysQbK+pMUE
+-----END SSH SIGNATURE-----

aoc_test.go

@@ -0,0 +1,280 @@
+package aoc_test
+
+import (
+	"fmt"
+	"sort"
+	"testing"
+
+	"github.com/matryer/is"
+	aoc "go.sour.is/advent-of-code"
+)
+
+
+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 TestPriorityQueue(t *testing.T) {
+	is := is.New(t)
+
+	type elem [2]int
+	less := func(b, a *elem) bool {
+		return (*a)[0] < (*b)[0]
+	}
+
+	pq := aoc.PriorityQueue(less)
+
+	pq.Insert(&elem{1, 4})
+	pq.Insert(&elem{3, 2})
+	pq.Insert(&elem{2, 3})
+	pq.Insert(&elem{4, 1})
+
+	v := pq.ExtractMin()
+	is.True(v != nil)
+	is.Equal(v, &elem{4, 1})
+
+	v = pq.ExtractMin()
+	is.True(v != nil)
+	is.Equal(v, &elem{3, 2})
+
+	v = pq.ExtractMin()
+	is.True(v != nil)
+	is.Equal(v, &elem{2, 3})
+
+	v = pq.ExtractMin()
+	is.True(v != nil)
+	is.Equal(v, &elem{1, 4})
+
+	v = pq.ExtractMin()
+	is.True(v == nil)
+}
+
+
+func ExamplePriorityQueue() {
+	type memo struct {
+		pt    int
+		score int
+	}
+	less := func(a, b *memo) bool { return a.score < b.score }
+
+	adj := map[int][][2]int{
+		0: {{1, 2}, {2, 6}},
+		1: {{3, 5}},
+		2: {{3, 8}},
+		3: {{4, 10}, {5, 15}},
+		4: {{6, 2}},
+		5: {{6, 6}},
+	}
+
+	pq := aoc.PriorityQueue(less)
+	visited := aoc.Set([]int{}...)
+	dist := aoc.DefaultMap[int](int(^uint(0) >> 1))
+
+	dist.Set(0, 0)
+	pq.Insert(&memo{0, 0})
+
+	for !pq.IsEmpty() {
+		m := pq.ExtractMin()
+
+		u := m.pt
+		if visited.Has(u) {
+			continue
+		}
+		visited.Add(u)
+
+		du, _ := dist.Get(u)
+
+		for _, edge := range adj[u] {
+			v, w := edge[0], edge[1]
+			dv, _ := dist.Get(v)
+
+			if !visited.Has(v) && du+w < dv {
+				dist.Set(v, du+w)
+				pq.Insert(&memo{v, du + w})
+			}
+		}
+	}
+
+	items := dist.Items()
+	sort.Slice(items, func(i, j int) bool { return items[i].K < items[j].K })
+	for _, v := range items {
+		fmt.Printf("point %d is %d steps away.\n", v.K, v.V)
+	}
+
+	// Output:
+	// point 0 is 0 steps away.
+	// point 1 is 2 steps away.
+	// point 2 is 6 steps away.
+	// point 3 is 7 steps away.
+	// point 4 is 17 steps away.
+	// point 5 is 22 steps away.
+	// point 6 is 19 steps away.
+}
+func TestGraph(t *testing.T) {
+	is := is.New(t)
+
+	var adjacencyList = map[int][]int{
+		2: {3, 5, 1},
+		1: {2, 4},
+		3: {6, 2},
+		4: {1, 5, 7},
+		5: {2, 6, 8, 4},
+		6: {3, 0, 9, 5},
+		7: {4, 8},
+		8: {5, 9, 7},
+		9: {6, 0, 8},
+	}
+
+	g := aoc.Graph(aoc.WithAdjacencyList[int, int](adjacencyList))
+	is.Equal(g.Neighbors(1), []int{2, 4})
+	is.Equal(map[int][]int(g.AdjacencyList()), adjacencyList)
+}
+
+func ExampleFibHeap() {
+	type memo struct {
+		pt    int
+		score int
+	}
+	less := func(a, b *memo) bool { return (*a).score < (*b).score }
+
+	adj := map[int][][2]int{
+		0: {{1, 2}, {2, 6}},
+		1: {{3, 5}},
+		2: {{3, 8}},
+		3: {{4, 10}, {5, 15}},
+		4: {{6, 2}},
+		5: {{6, 6}},
+	}
+
+	pq := aoc.FibHeap(less)
+	visited := aoc.Set([]int{}...)
+	dist := aoc.DefaultMap[int](int(^uint(0) >> 1))
+
+	dist.Set(0, 0)
+	pq.Insert(&memo{0, 0})
+
+	for !pq.IsEmpty() {
+		m := pq.ExtractMin()
+
+		u := m.pt
+		if visited.Has(u) {
+			continue
+		}
+		visited.Add(u)
+
+		du, _ := dist.Get(u)
+
+		for _, edge := range adj[u] {
+			v, w := edge[0], edge[1]
+			dv, _ := dist.Get(v)
+
+			if !visited.Has(v) && du+w < dv {
+				dist.Set(v, du+w)
+				pq.Insert(&memo{v, du + w})
+			}
+		}
+	}
+
+	items := dist.Items()
+	sort.Slice(items, func(i, j int) bool { return items[i].K < items[j].K })
+	for _, v := range items {
+		fmt.Printf("point %d is %d steps away.\n", v.K, v.V)
+	}
+
+	// Output:
+	// point 0 is 0 steps away.
+	// point 1 is 2 steps away.
+	// point 2 is 6 steps away.
+	// point 3 is 7 steps away.
+	// point 4 is 17 steps away.
+	// point 5 is 22 steps away.
+	// point 6 is 19 steps away.
+}
+
+func TestFibHeap(t *testing.T) {
+	is := is.New(t)
+
+	type elem [2]int
+	less := func(a, b *elem) bool {
+		return (*a)[0] < (*b)[0]
+	}
+
+	pq := aoc.FibHeap(less)
+
+	pq.Insert(&elem{1, 4})
+	pq.Insert(&elem{3, 2})
+	pq.Insert(&elem{2, 3})
+	pq.Insert(&elem{4, 1})
+
+	v := pq.ExtractMin()
+	is.True(v != nil)
+	is.Equal(v, &elem{1, 4})
+
+	pq.Insert(&elem{5, 8})
+	pq.Insert(&elem{6, 7})
+	pq.Insert(&elem{7, 6})
+	pq.Insert(&elem{8, 5})
+
+	v = pq.ExtractMin()
+	is.True(v != nil)
+	is.Equal(v, &elem{2, 3})
+
+	v = pq.ExtractMin()
+	is.True(v != nil)
+	is.Equal(v, &elem{3, 2})
+
+	v = pq.ExtractMin()
+	is.True(v != nil)
+	is.Equal(v, &elem{4, 1})
+
+	v = pq.ExtractMin()
+	is.True(v != nil)
+	is.Equal(v, &elem{5, 8})
+
+	m := aoc.FibHeap(less)
+	m.Insert(&elem{1, 99})
+	m.Insert(&elem{12, 9})
+	m.Insert(&elem{11, 10})
+	m.Insert(&elem{10, 11})
+	m.Insert(&elem{9, 12})
+
+	pq.Merge(m)
+
+	v = pq.Find(func(t *elem) bool {
+		return (*t)[0] == 6
+	})
+	is.Equal(v, &elem{6, 7})
+
+	v = pq.Find(func(t *elem) bool {
+		return (*t)[0] == 12
+	})
+	is.Equal(v, &elem{12, 9})
+
+	v = pq.ExtractMin()
+	is.True(v != nil)
+	is.Equal(v, &elem{1, 99})
+
+	pq.DecreaseKey(
+		func(t *elem) bool { return t[0] == 12 },
+		func(t *elem) { t[0] = 3 },
+	)
+
+	v = pq.ExtractMin()
+	is.True(v != nil)
+	is.Equal(v, &elem{3, 9})
+
+	var keys []int
+	for !pq.IsEmpty() {
+		v := pq.ExtractMin()
+		fmt.Println(v)
+		keys = append(keys, v[0])
+	}
+	is.Equal(keys, []int{6, 7, 8, 9, 10, 11})
+}

day01/main_test.go

@@ -30,7 +30,6 @@ func TestExample1(t *testing.T) {
 	is.Equal(result.sum, 142)
 }
 
-
 func TestExample2(t *testing.T) {
 	is := is.New(t)
 	scan := bufio.NewScanner(bytes.NewReader(example2))

day07/main.go

@@ -16,7 +16,7 @@ type result struct {
 }
 
 func run(scan *bufio.Scanner) (result, error) {
-	var game1, game2 Game
+	var game Game
 
 	for scan.Scan() {
 		var cards string
@@ -27,18 +27,15 @@ func run(scan *bufio.Scanner) (result, error) {
 		}
 
 		fmt.Println("cards", cards, "bid", bid)
-		game1.Append(cards, bid)
-		game2.Append(cards, bid)
+		game.plays = append(game.plays, Play{bid, []rune(cards), &game})
 	}
 
-	game1.cardTypes = cardTypes1
-	game1.cardOrder = getOrder(cardTypes1)
-	product1 := calcProduct(game1)
+	game.cardOrder = getOrder(cardTypes1)
+	product1 := calcProduct(game)
 
-	game2.cardTypes = cardTypes2
-	game2.cardOrder = getOrder(cardTypes2)
-	game2.wildCard = 'J'
-	product2 := calcProduct(game2)
+	game.cardOrder = getOrder(cardTypes2)
+	game.wildCard = 'J'
+	product2 := calcProduct(game)
 
 	return result{product1, product2}, nil
 }
@@ -69,108 +66,92 @@ func getOrder(cardTypes []rune) map[rune]int {
 type Game struct {
 	plays     Plays
 	cardOrder map[rune]int
-
-	cardTypes []rune
 	wildCard  rune
 }
 
-func (g *Game) Append(cards string, bid int) {
-	p := Play{bid: bid, hand: []rune(cards), game: g}
-	g.plays = append(g.plays, p)
-}
-
 type Play struct {
 	bid  int
 	hand Hand
-	cardCounts map[rune]int
-    strength int
-
 	game *Game
 }
 
 type Hand []rune
 
-func (h *Play) HandType() string {
-	hs := h.HandStrength()
-	kind := hs& 0xf00000
-	hc := h.game.cardTypes[13-hs&0xf0000>>16]
-	switch kind {
-	case 0x700000:
+func (h Play) HandType() string {
+	hc, _ := h.HighCard()
+	switch {
+	case h.IsFiveOfKind():
 		return "5K-" + string(hc)
-	case 0x600000:
+	case h.IsFourOfKind():
 		return "4K-" + string(hc)
-	case 0x500000:
+	case h.IsFullHouse():
 		return "FH-" + string(hc)
-	case 0x400000:
+	case h.IsThreeOfKind():
 		return "3K-" + string(hc)
-	case 0x300000:
+	case h.IsTwoPair():
 		return "2P-" + string(hc)
-	case 0x200000:
+	case h.IsOnePair():
 		return "1P-" + string(hc)
-	case 0x100000:
+	case h.IsHighCard():
 		return "HC-" + string(hc)
 	}
 	return "Uno"
 }
 
-func (p *Play) HandStrength() int {
-	_, v := p.HighCard()
-
+func (h Play) HandStrength() int {
+	_, v := h.HighCard()
 	switch {
-	case p.IsFiveOfKind():
-		p.strength = 0x700000 | v
-	case p.IsFourOfKind():
-		p.strength = 0x600000 | v
-	case p.IsFullHouse():
-		p.strength = 0x500000 | v
-	case p.IsThreeOfKind():
-		p.strength = 0x400000 | v
-	case p.IsTwoPair():
-		p.strength = 0x300000 | v
-	case p.IsOnePair():
-		p.strength = 0x200000 | v
-	case p.IsHighCard():
-		p.strength = 0x100000 | v
+	case h.IsFiveOfKind():
+		return 0x700000 | v
+	case h.IsFourOfKind():
+		return 0x600000 | v
+	case h.IsFullHouse():
+		return 0x500000 | v
+	case h.IsThreeOfKind():
+		return 0x400000 | v
+	case h.IsTwoPair():
+		return 0x300000 | v
+	case h.IsOnePair():
+		return 0x200000 | v
+	case h.IsHighCard():
+		return 0x100000 | v
 	}
-	return p.strength
+	return 0
 }
 
 func (h Play) IsFiveOfKind() bool {
-	_, _, _, _, has5 := h.game.hasSame(h.cardCounts)
+	_, _, _, _, has5 := h.game.hasSame(h.hand)
 	return has5
 }
 func (h Play) IsFourOfKind() bool {
-	_, _, _, has4, _ := h.game.hasSame(h.cardCounts)
+	_, _, _, has4, _ := h.game.hasSame(h.hand)
 	return has4
 }
 func (h Play) IsFullHouse() bool {
-	_, has2, has3, _, _ := h.game.hasSame(h.cardCounts)
+	_, has2, has3, _, _ := h.game.hasSame(h.hand)
 	return has3 && has2
 }
 func (h Play) IsThreeOfKind() bool {
-	has1, _, has3, _, _ := h.game.hasSame(h.cardCounts)
+	has1, _, has3, _, _ := h.game.hasSame(h.hand)
 	return has3 && has1
 }
 func (h Play) IsTwoPair() bool {
-	_, has2, has3, _, _ := h.game.hasSame(h.cardCounts)
-	return !has3 && has2 && h.game.pairs(h.cardCounts) == 2
+	_, has2, has3, _, _ := h.game.hasSame(h.hand)
+	return !has3 && has2 && h.game.pairs(h.hand) == 2
 }
 func (h Play) IsOnePair() bool {
-	_, has2, has3, _, _ := h.game.hasSame(h.cardCounts)
-	return !has3 && has2 && h.game.pairs(h.cardCounts) == 1
+	_, has2, has3, _, _ := h.game.hasSame(h.hand)
+	return !has3 && has2 && h.game.pairs(h.hand) == 1
 }
 func (h Play) IsHighCard() bool {
-	has1, has2, has3, has4, _ := h.game.hasSame(h.cardCounts)
+	has1, has2, has3, has4, _ := h.game.hasSame(h.hand)
 	return has1 && !has2 && !has3 && !has4
 }
-func (h *Play) HighCard() (rune, int) {
-	if h.cardCounts == nil {
-		h.generateCounts()
-	}
-	
+func (h Play) HighCard() (rune, int) {
 	var i int
 	pairs := make(Pairs, 5)
-	for r, c := range h.cardCounts {
+	cnt := h.game.Counts(h.hand)
+	for r, c := range cnt {
 		pairs[i].c = c
 		pairs[i].r = r
 		pairs[i].o = h.game.cardOrder[r]
@@ -213,32 +194,29 @@ func (p Plays) Len() int           { return len(p) }
 func (p Plays) Less(i, j int) bool { return p[i].HandStrength() < p[j].HandStrength() }
 func (p Plays) Swap(i, j int)      { p[i], p[j] = p[j], p[i] }
 
-func (p *Play) generateCounts() {
-	cardOrder := p.game.cardOrder
-	wildCard := p.game.wildCard
-
-	p.cardCounts = make(map[rune]int, len(cardOrder))
-	for _, c := range p.hand {
-		p.cardCounts[c]++
+func (g *Game) Counts(cards []rune) map[rune]int {
+	m := make(map[rune]int, len(g.cardOrder))
+	for _, c := range cards {
+		m[c]++
 	}
-
-	if wildCard != 0 && p.cardCounts[wildCard] > 0 {
+	if g.wildCard != 0 && m[g.wildCard] > 0 {
 		var maxK rune
 		var maxV int
-		for k, v := range p.cardCounts {
-			if k != wildCard && v > maxV {
+		for k, v := range m {
+			if k != g.wildCard && v > maxV {
 				maxK, maxV = k, v
 			}
 		}
-
 		if maxK != 0 {
-			p.cardCounts[maxK] += p.cardCounts[wildCard]
-			delete(p.cardCounts, wildCard)
+			m[maxK] += m[g.wildCard]
+			delete(m, g.wildCard)
 		}
 	}
+	return m
 }
-func (g *Game) hasSame(counts map[rune]int) (has1, has2, has3, has4, has5 bool) {
-	for _, c := range counts {
+func (g *Game) hasSame(cards []rune) (has1, has2, has3, has4, has5 bool) {
+	cnt := g.Counts(cards)
+	for _, c := range cnt {
 		switch c {
 		case 1:
 			has1 = true
@@ -258,9 +236,9 @@ func (g *Game) hasSame(counts map[rune]int) (has1, has2, has3, has4, has5 bool)
 	}
 	return
 }
-func (g *Game) pairs(counts map[rune]int) int {
+func (g *Game) pairs(cards []rune) int {
 	pairs := 0
-	for _, n := range counts {
+	for _, n := range g.Counts(cards) {
 		if n == 2 {
 			pairs++
 		}

day07/main_test.go

@@ -26,21 +26,18 @@ func TestHands(t *testing.T) {
 	var game Game
 	game.cardOrder = getOrder(cardTypes1)
 
-	h := Play{hand: []rune("AAA23"), game: &game}
-	// h.generateCounts()
+	h := Play{0, []rune("AAA23"), &game}
 	is.Equal(h.HandType(), "3K-A")
 
-	h = Play{hand: []rune("JJJJJ"), game:&game}
-	h.generateCounts()
-
+	h = Play{0, []rune("JJJJJ"), &game}
 	is.Equal(h.HandType(), "5K-J")
 	is.Equal(fmt.Sprintf("%x", h.HandStrength()), "7aaaaa")
 
-	h = Play{hand: []rune("KKKKJ"), game: &game}
+	h = Play{0, []rune("KKKKJ"), &game}
 	is.Equal(h.HandType(), "4K-K")
 	is.Equal(fmt.Sprintf("%x", h.HandStrength()), "6cccca")
 
-	h = Play{hand: []rune("QQQJA"), game: &game}
+	h = Play{0, []rune("QQQJA"), &game}
 	is.Equal(h.HandType(), "3K-Q")
 	is.Equal(fmt.Sprintf("%x", h.HandStrength()), "4bbbad")
 }

day14/main_test.go

@@ -36,11 +36,10 @@ func TestSolution(t *testing.T) {
 	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.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)
 }
-

day16/main.go

@@ -32,15 +32,15 @@ func run(scan *bufio.Scanner) (*result, error) {
 
 	options := make([]int, 2*(rows+cols)+2)
 	i := 0
-	for j:=0; j<=rows-1; j++ {
+	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
+		i += 2
 	}
-	for j:=0; j<=cols-1; j++ {
+	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
+		i += 2
 	}
 
 	// fmt.Println(options)
@@ -96,7 +96,6 @@ func (m *Map) Get(p [2]int) rune {
 	return (*m)[p[0]][p[1]]
 }
 
-
 func runCycle(m Map, r ray) int {
 	current := r
 

day17/example.txt

@@ -0,0 +1,13 @@
+2413432311323
+3215453535623
+3255245654254
+3446585845452
+4546657867536
+1438598798454
+4457876987766
+3637877979653
+4654967986887
+4564679986453
+1224686865563
+2546548887735
+4322674655533

day17/input.txt

@@ -0,0 +1,141 @@
+222343122415245553243251316124223234134666332224124211645376775672443247264263475261513546522316162532215534453661231232515522214351143451211
+422125443253354142511545636246664666565355152246453231651172747635424163415626462753445445312334225221624336126244661514234445544425223533122
+131212112421423414125516356342555542626661163526211536677376523712262371162153644117776261645533664544366146314432523222515425314231311544521
+131334344235153415214541223454455223563154114267331524774136127715554416125273543276346471735741663351266324144422511534542234341513351345352
+314541545523112111131565114333211153312641614321771374726154434476767125613311254537363422511721275135434164664442151263234241114111121141334
+435153335153513534132112326653656626231351436457153446433363235565156156723233715473535244413451723176561153261562445512312413413513135513241
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day17/main.go

@@ -0,0 +1,225 @@
+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 aoc.Map[int16, rune]
+
+	for scan.Scan() {
+		text := scan.Text()
+		m = append(m, []rune(text))
+	}
+	log("start day 17")
+
+	result := result{}
+	result.valuePT1 = search(m, 1, 3, seenFn)
+	log("result from part 1 = ", result.valuePT1)
+
+	result.valuePT2 = search(m, 4, 10, nil)
+	log("result from part 2 = ", result.valuePT2)
+
+	return &result, nil
+}
+
+type Point = aoc.Point[int16]
+type Map = aoc.Map[int16, rune]
+
+// rotate for changing direction
+type rotate int8
+
+const (
+	CW  rotate = 1
+	CCW rotate = -1
+)
+
+// diretion of path steps
+type direction int8
+
+var (
+	U = Point{-1, 0}
+	R = Point{0, 1}
+	D = Point{1, 0}
+	L = Point{0, -1}
+)
+
+var directions = []Point{U, R, D, L}
+
+var directionIDX = func() map[Point]direction {
+	m := make(map[Point]direction, len(directions))
+	for k, v := range directions {
+		m[v] = direction(k)
+	}
+	return m
+}()
+
+// position on the map
+type position struct {
+	loc       Point
+	direction Point
+	steps     int8
+}
+
+func (p position) step() position {
+	return position{p.loc.Add(p.direction), p.direction, p.steps + 1}
+}
+func (p position) rotateAndStep(towards rotate) position {
+	d := directions[(int8(directionIDX[p.direction])+int8(towards)+4)%4]
+	return position{p.loc.Add(d), d, 1}
+}
+
+// implements FindPath graph interface
+type graph struct {
+	min, max int8
+	m        Map
+	target   Point
+	reads    int
+	seenFn   func(a position) position
+}
+
+// Neighbors returns valid steps from given position. if at target returns none.
+func (g *graph) Neighbors(current position) []position {
+	var nbs []position
+
+	if current.steps == 0 {
+		return []position{
+			{R, R, 1},
+			{D, D, 1},
+		}
+	}
+
+	if current.loc == g.target {
+		return nil
+	}
+
+	if left := current.rotateAndStep(CCW); current.steps >= g.min && g.m.Valid(left.loc) {
+		nbs = append(nbs, left)
+	}
+
+	if right := current.rotateAndStep(CW); current.steps >= g.min && g.m.Valid(right.loc) {
+		nbs = append(nbs, right)
+	}
+
+	if forward := current.step(); current.steps < g.max && g.m.Valid(forward.loc) {
+		nbs = append(nbs, forward)
+	}
+
+	return nbs
+}
+
+// Cost calculates heat cost to neighbor from map
+func (g *graph) Cost(a, b position) int16 {
+	g.reads++
+	_, r, _ := g.m.Get(b.loc)
+	return int16(r - '0')
+}
+
+// Potential calculates distance to target
+// func (g *graph) Potential(a position) int16 {
+// 	return aoc.ManhattanDistance(a.loc, g.target)
+// }
+
+// Target returns true when target reached. receives node and cost.
+func (g *graph) Target(a position, c int16) bool {
+	if a.loc == g.target && a.steps >= g.min && a.steps <= g.max {
+		return true
+	}
+	return false
+}
+
+// Seen attempt at simplifying the seen to use horizontal/vertical and no steps.
+// It returns correct for part1 but not part 2..
+func (g *graph) Seen(a position) position {
+	if g.seenFn != nil {
+		return g.seenFn(a)
+	}
+	return a
+}
+
+func seenFn(a position) position {
+	if a.direction == U {
+		a.direction = D
+	}
+	if a.direction == L {
+		a.direction = R
+	}
+	// a.steps = 0
+	return a
+}
+
+func search(m Map, minSteps, maxSteps int8, seenFn func(position) position) int {
+	rows, cols := m.Size()
+	start := Point{}
+	target := Point{rows - 1, cols - 1}
+
+	g := graph{min: minSteps, max: maxSteps, m: m, target: target, seenFn: seenFn}
+
+	cost, path, closed := aoc.FindPath[int16, position](&g, position{loc: start}, position{loc: target})
+
+	log("total map reads = ", g.reads, "cost = ", cost)
+	printGraph(m, path, closed, g.seenFn)
+
+	return int(cost)
+}
+
+// printGraph with the path/cost overlay
+func printGraph(m Map, path []position, closed map[position]int16, seenFn func(a position) position) {
+	pts := make(map[Point]position, len(path))
+	for _, pt := range path {
+		pts[pt.loc] = pt
+	}
+
+	clpt := make(map[position]position, len(closed))
+	for pt := range closed {
+		clpt[position{loc: pt.loc, steps: pt.steps}] = pt
+	}
+
+	for r, row := range m {
+		// if r == 0 {
+		// 	for c := range row {
+		// 		if c == 0 {
+		// 			fmt.Print("     ")
+		// 		}
+		// 		fmt.Printf("% 5d", c)
+		// 	}
+		// 	fmt.Println("")
+		// }
+		for c := range row {
+			// if c == 0 {
+			// 	fmt.Printf("% 5d", r)
+			// }
+
+			if pt, ok := pts[Point{int16(r), int16(c)}]; ok {
+				if seenFn != nil {
+					pt = seenFn(pt)
+				}
+				_ = pt
+				// fmt.Printf("% 5d", closed[pt])
+				fmt.Print("*")
+
+				continue
+			}
+
+			// fmt.Print(" ....")
+			fmt.Print(" ")
+		}
+		fmt.Println("")
+	}
+	fmt.Println("")
+}

day17/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, 102)
+	is.Equal(result.valuePT2, 94)
+}
+
+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, 843)
+	is.Equal(result.valuePT2, 1017)
+}

day18/example.txt

@@ -0,0 +1,14 @@
+R 6 (#70c710)
+D 5 (#0dc571)
+L 2 (#5713f0)
+D 2 (#d2c081)
+R 2 (#59c680)
+D 2 (#411b91)
+L 5 (#8ceee2)
+U 2 (#caa173)
+L 1 (#1b58a2)
+U 2 (#caa171)
+R 2 (#7807d2)
+U 3 (#a77fa3)
+L 2 (#015232)
+U 2 (#7a21e3)

day18/input.txt

@@ -0,0 +1,766 @@
+R 4 (#0a7a60)
+U 8 (#4453b3)
+R 6 (#8e4f70)
+U 2 (#4453b1)
+R 4 (#0feb00)
+U 4 (#355591)
+R 8 (#2a09c0)
+U 4 (#544c71)
+R 4 (#472930)
+U 2 (#199e33)
+R 3 (#3d8df0)
+U 5 (#199e31)
+R 7 (#45de50)
+U 4 (#57a941)
+L 7 (#671c70)
+U 5 (#5e5e81)
+R 4 (#2e9b60)
+U 8 (#490881)
+L 7 (#1846f0)
+U 3 (#304101)
+L 4 (#1846f2)
+D 2 (#58f3f1)
+L 9 (#2e9b62)
+D 2 (#56dcd1)
+L 2 (#671c72)
+D 9 (#275fd1)
+L 4 (#76b7b2)
+U 9 (#5b9641)
+L 4 (#1d3212)
+U 10 (#3d1841)
+L 3 (#5ad5e2)
+D 6 (#010211)
+L 5 (#13ec52)
+D 8 (#166471)
+L 3 (#53ebc0)
+D 5 (#0fdba1)
+L 4 (#54e450)
+D 9 (#440a21)
+L 3 (#49b242)
+D 5 (#2f0171)
+L 6 (#447332)
+D 4 (#182561)
+L 8 (#1aaaa2)
+D 6 (#0996a1)
+L 4 (#1c1212)
+D 6 (#5780d1)
+L 7 (#0fc1d2)
+D 7 (#36cb41)
+L 3 (#505552)
+D 7 (#8d8b81)
+R 4 (#2bf742)
+D 7 (#152791)
+R 5 (#760492)
+D 3 (#11a991)
+R 3 (#5debc0)
+D 10 (#59f211)
+L 4 (#66d342)
+D 8 (#1fc6b1)
+R 4 (#66d340)
+D 6 (#72dff1)
+L 2 (#3f1b10)
+D 4 (#2fca13)
+L 10 (#2d0162)
+D 5 (#8b5e53)
+L 6 (#2d0160)
+U 2 (#317053)
+L 2 (#650c20)
+U 7 (#2bed01)
+R 10 (#409ed0)
+U 2 (#166713)
+L 10 (#939350)
+U 6 (#166711)
+L 4 (#38a180)
+D 3 (#1d95f1)
+L 6 (#11ea60)
+D 5 (#931dc1)
+R 6 (#11bf70)
+D 7 (#536051)
+L 3 (#995b60)
+D 2 (#254e91)
+L 3 (#332fd2)
+U 6 (#7669f1)
+L 3 (#574642)
+U 6 (#1778a1)
+L 3 (#1a00c2)
+U 5 (#2eaa81)
+L 3 (#1cf8e2)
+U 6 (#0c71a1)
+L 6 (#868472)
+U 3 (#0a9fd1)
+R 9 (#104c02)
+U 4 (#082451)
+L 7 (#850d02)
+U 6 (#082453)
+L 7 (#322552)
+U 3 (#1339d1)
+L 6 (#8e11d2)
+U 4 (#6c5691)
+R 6 (#1dda10)
+U 3 (#25e5c3)
+R 7 (#370670)
+U 4 (#9324f1)
+L 3 (#451030)
+U 7 (#1f1021)
+L 7 (#0ba3c0)
+U 5 (#8a10a3)
+L 8 (#67db30)
+U 5 (#282473)
+L 4 (#0cd350)
+U 4 (#25e5c1)
+R 3 (#6b4ee0)
+U 4 (#333cf1)
+R 5 (#02b610)
+D 4 (#4e7cc1)
+R 3 (#92abb0)
+U 5 (#2f6ff1)
+R 5 (#483360)
+U 5 (#7b1cd1)
+L 8 (#3a5d50)
+U 3 (#1d2461)
+R 8 (#3b2fd0)
+U 5 (#630763)
+R 6 (#5033c0)
+U 3 (#252523)
+R 7 (#08eeb0)
+U 8 (#516633)
+L 7 (#156240)
+U 4 (#2db063)
+L 3 (#791070)
+D 5 (#2920a3)
+L 3 (#0dafe0)
+U 5 (#4185b3)
+L 5 (#7ac0e0)
+U 2 (#5a6cd3)
+L 2 (#3ca790)
+U 7 (#755403)
+L 4 (#3b0740)
+U 5 (#2004a3)
+L 3 (#2db4f0)
+U 6 (#602a23)
+R 5 (#32c1c0)
+D 2 (#000f53)
+R 5 (#388360)
+D 7 (#24d9e3)
+R 4 (#4703a0)
+D 3 (#2f1133)
+R 3 (#4703a2)
+U 11 (#52e853)
+R 5 (#278132)
+D 11 (#0665e3)
+R 3 (#239112)
+U 6 (#8f0ad1)
+R 5 (#447de2)
+U 6 (#8f0ad3)
+R 6 (#636122)
+U 2 (#187283)
+R 3 (#5aae62)
+U 10 (#1d8833)
+L 5 (#476db0)
+U 5 (#136393)
+L 7 (#29e6b0)
+U 5 (#136391)
+R 7 (#3ba060)
+U 3 (#635e23)
+L 5 (#2042f0)
+U 3 (#181643)
+L 6 (#5af952)
+U 8 (#28d0b1)
+L 2 (#4a98f2)
+U 9 (#28d0b3)
+L 6 (#27a572)
+D 3 (#3d7213)
+L 4 (#516842)
+D 11 (#21ef63)
+L 5 (#38e342)
+D 2 (#1118b3)
+L 3 (#560502)
+D 9 (#1118b1)
+R 2 (#1c39a2)
+D 2 (#303ab3)
+R 6 (#716ba0)
+D 6 (#780a93)
+L 8 (#77ec30)
+U 2 (#780a91)
+L 3 (#271100)
+U 10 (#5882f3)
+L 4 (#2050c2)
+D 3 (#434843)
+L 3 (#7d9572)
+D 2 (#3129b3)
+L 5 (#21fb12)
+D 5 (#8c2c33)
+L 4 (#57bf92)
+D 6 (#2730b3)
+L 4 (#6a3902)
+D 8 (#4656a3)
+L 5 (#60ac80)
+D 4 (#43b863)
+R 9 (#3d69a0)
+D 8 (#3ca913)
+L 2 (#411d80)
+D 3 (#725383)
+L 8 (#4a98d0)
+D 9 (#274553)
+L 5 (#580d60)
+U 5 (#568223)
+L 6 (#473af0)
+U 5 (#827593)
+L 7 (#251dc2)
+U 5 (#0fcea3)
+L 8 (#5ae3d2)
+U 3 (#4efa11)
+R 9 (#389852)
+U 2 (#7f7f91)
+R 6 (#618342)
+U 3 (#441143)
+L 7 (#886df2)
+U 3 (#26a093)
+L 8 (#886df0)
+U 4 (#63c7d3)
+L 3 (#04f842)
+D 10 (#0fcea1)
+L 6 (#388e62)
+U 10 (#3ae7f3)
+L 3 (#2a6880)
+U 6 (#3bfd53)
+L 6 (#73a0c0)
+U 5 (#3bfd51)
+L 4 (#0d18a0)
+U 2 (#19da93)
+L 6 (#120600)
+U 8 (#233b53)
+L 6 (#2e1050)
+U 3 (#4b2aa3)
+L 4 (#5f9930)
+U 10 (#6e65f1)
+R 6 (#1eefa0)
+U 9 (#50b9d3)
+R 2 (#548ed0)
+U 9 (#50b9d1)
+R 7 (#8bd9f0)
+U 4 (#5ae473)
+R 6 (#0b0490)
+U 10 (#186891)
+R 4 (#764830)
+U 7 (#33b0e1)
+R 5 (#363c90)
+U 8 (#7bd631)
+R 7 (#031e30)
+U 7 (#095881)
+R 3 (#640e50)
+D 5 (#02e7f3)
+R 7 (#0922f0)
+D 7 (#6b7af3)
+R 9 (#0922f2)
+D 3 (#62e543)
+R 3 (#21e320)
+U 9 (#5ead81)
+R 7 (#01fd70)
+D 9 (#3b0cf1)
+R 2 (#2758a0)
+D 5 (#7279b1)
+R 8 (#5c7dc0)
+D 7 (#3c8db1)
+R 4 (#3c3740)
+U 2 (#26b151)
+R 6 (#11eb12)
+U 4 (#587921)
+R 6 (#11eb10)
+U 4 (#320051)
+R 4 (#038630)
+U 3 (#6a2e61)
+R 2 (#4ff680)
+U 5 (#3c57f1)
+R 9 (#0b2440)
+U 8 (#497533)
+L 6 (#704680)
+U 11 (#549113)
+R 6 (#23b470)
+U 4 (#9e0641)
+R 7 (#1aeec0)
+D 7 (#4a6331)
+R 2 (#547d80)
+D 5 (#457a71)
+R 9 (#7daa90)
+D 4 (#16d7b1)
+L 6 (#266810)
+D 3 (#363561)
+L 5 (#5312b2)
+D 4 (#42c301)
+R 5 (#9a0952)
+D 7 (#42c303)
+R 7 (#7d1df2)
+D 4 (#51e321)
+R 5 (#609422)
+D 4 (#3b8f01)
+R 6 (#644792)
+U 4 (#2d8b11)
+R 7 (#22bbc2)
+D 7 (#6b39b1)
+R 5 (#680e72)
+U 2 (#7f9f31)
+R 3 (#0e9b52)
+U 3 (#3086c1)
+R 3 (#5a60c0)
+U 6 (#53b6e3)
+R 7 (#8117d0)
+U 7 (#53b6e1)
+R 3 (#2cb930)
+U 3 (#1bffd1)
+R 6 (#4539f0)
+U 8 (#680411)
+R 4 (#6032c0)
+U 6 (#255061)
+R 3 (#5562a0)
+U 6 (#088071)
+R 3 (#3bf2f0)
+U 5 (#52bdb1)
+L 6 (#070500)
+U 5 (#69e001)
+R 6 (#070502)
+U 3 (#071051)
+R 2 (#036000)
+U 4 (#0ea8a1)
+R 5 (#05e4d0)
+U 3 (#674de1)
+R 3 (#804250)
+D 6 (#3ffca1)
+R 4 (#23dcb2)
+D 6 (#9f9841)
+L 5 (#45f210)
+D 9 (#15efc1)
+R 5 (#45f212)
+D 4 (#969551)
+L 9 (#23dcb0)
+D 2 (#41bea1)
+L 4 (#2f2a32)
+D 4 (#71ffd1)
+R 3 (#5c0bb2)
+D 7 (#6f3501)
+R 4 (#2b0a72)
+D 4 (#7b3571)
+R 3 (#1c67d2)
+U 11 (#42f011)
+R 3 (#51ae62)
+D 3 (#75fcf1)
+R 3 (#1f4742)
+D 4 (#2813f1)
+R 4 (#3d1812)
+D 2 (#2b1d01)
+R 11 (#1eb302)
+U 3 (#27b0a1)
+R 4 (#227b20)
+U 5 (#34b7e1)
+R 10 (#201220)
+U 7 (#0502f3)
+R 4 (#5ab7f0)
+U 4 (#0502f1)
+R 4 (#5d09b0)
+U 7 (#504a81)
+R 7 (#1e8250)
+U 3 (#715aa1)
+R 6 (#26d290)
+U 6 (#9a12f1)
+L 3 (#18be90)
+U 8 (#037d11)
+L 5 (#647600)
+U 3 (#40b983)
+L 5 (#04e450)
+U 3 (#9a9a43)
+L 8 (#04e452)
+U 6 (#8af153)
+R 8 (#6cbc90)
+U 4 (#04d121)
+L 4 (#285292)
+U 3 (#688d51)
+L 6 (#176332)
+U 4 (#400a91)
+L 5 (#176330)
+U 5 (#43def1)
+R 2 (#285290)
+U 2 (#3e0711)
+R 3 (#7eb9c0)
+U 7 (#36f611)
+R 7 (#666af0)
+D 7 (#381b31)
+R 3 (#298922)
+U 3 (#475671)
+R 6 (#977c12)
+D 4 (#602d01)
+R 6 (#25b0c2)
+D 6 (#7ede81)
+R 3 (#1d58c2)
+D 8 (#873523)
+L 9 (#265ae2)
+D 3 (#57d663)
+R 7 (#1565c2)
+D 8 (#06ed11)
+R 4 (#a348c2)
+D 2 (#06ed13)
+R 8 (#12d052)
+D 4 (#2d3741)
+L 7 (#0ccfd2)
+D 3 (#1fcd61)
+R 4 (#39a4c2)
+D 3 (#44f7f1)
+R 6 (#5c3202)
+D 8 (#2625c1)
+L 8 (#2b08c2)
+D 2 (#20d7e1)
+L 2 (#67b892)
+D 10 (#546471)
+R 7 (#484ef2)
+D 7 (#49bc91)
+R 4 (#91aa72)
+U 11 (#499591)
+R 3 (#0048b2)
+U 7 (#34a7a1)
+R 7 (#514600)
+U 8 (#1cdc43)
+L 7 (#471470)
+U 3 (#8c8393)
+R 3 (#18a780)
+U 5 (#8c8391)
+R 3 (#4e6f80)
+U 3 (#1cdc41)
+R 8 (#428930)
+U 5 (#5dcb51)
+R 3 (#4b21e2)
+U 4 (#0464b1)
+R 9 (#850552)
+D 8 (#464881)
+R 7 (#543852)
+D 3 (#2d3a11)
+R 3 (#081b22)
+D 5 (#0cc731)
+R 7 (#6990e0)
+D 3 (#79d7b1)
+R 3 (#509520)
+D 5 (#438571)
+R 3 (#27d510)
+D 3 (#30d2d3)
+L 8 (#1b7a00)
+D 5 (#8a0da3)
+L 8 (#1b7a02)
+U 5 (#027cb3)
+L 7 (#350130)
+D 8 (#2ff771)
+R 7 (#16dc02)
+D 2 (#68f1c1)
+R 5 (#02f782)
+D 6 (#4e2a41)
+R 11 (#448e32)
+D 5 (#2cfac1)
+L 11 (#417502)
+D 5 (#2cfac3)
+L 4 (#22f022)
+U 9 (#1e9f01)
+L 5 (#543572)
+U 3 (#076e31)
+L 6 (#081b20)
+U 5 (#1ae851)
+L 3 (#823132)
+U 9 (#2d7993)
+L 4 (#5738f2)
+D 8 (#79e273)
+L 4 (#5c9ad2)
+D 8 (#4ed1b3)
+L 3 (#311722)
+D 4 (#0d5493)
+L 6 (#5d63e0)
+D 6 (#178cf3)
+L 5 (#75b1b0)
+D 5 (#178cf1)
+L 6 (#11d550)
+D 6 (#44ed03)
+L 3 (#76a842)
+U 6 (#3b6993)
+L 5 (#184892)
+D 4 (#5c8163)
+L 3 (#14d872)
+U 2 (#261a01)
+L 5 (#2d01e2)
+U 9 (#326ca3)
+L 4 (#59ad32)
+U 8 (#326ca1)
+R 4 (#389ab2)
+U 9 (#261a03)
+L 4 (#50cb42)
+D 4 (#2f8263)
+L 5 (#9f3752)
+D 6 (#4bb383)
+L 4 (#2693f2)
+D 4 (#19dca3)
+R 4 (#475bc2)
+D 6 (#960e13)
+L 7 (#0c90a2)
+D 8 (#3463d3)
+L 6 (#5a82e2)
+D 3 (#5a5c43)
+R 7 (#120bf2)
+D 3 (#5069e3)
+R 3 (#4b47a2)
+D 6 (#635b63)
+R 4 (#66ca10)
+U 4 (#1418f1)
+R 7 (#1d5470)
+D 4 (#1418f3)
+R 8 (#66d4f0)
+D 5 (#3c5533)
+R 4 (#2f6e02)
+D 3 (#2cf5e3)
+R 4 (#633ec2)
+D 7 (#2cf5e1)
+R 7 (#5846b2)
+D 3 (#4f9d63)
+R 4 (#533380)
+D 11 (#13c7e3)
+R 2 (#222b62)
+D 3 (#928ab3)
+R 5 (#222b60)
+U 5 (#0a4793)
+R 5 (#15d3b0)
+U 8 (#363fe1)
+R 4 (#2feb30)
+U 5 (#05d8b1)
+R 3 (#39e030)
+U 3 (#05d8b3)
+R 2 (#3cd780)
+U 8 (#02c781)
+R 5 (#186452)
+D 3 (#37bba1)
+R 5 (#9e1232)
+D 5 (#58e6f1)
+R 5 (#182c30)
+D 5 (#072db1)
+R 5 (#85e600)
+D 4 (#607651)
+R 5 (#186450)
+D 3 (#0aca91)
+L 5 (#0ceb10)
+D 5 (#860001)
+L 6 (#54c8b0)
+U 5 (#393971)
+L 4 (#37c390)
+D 3 (#1f1433)
+L 5 (#3d8790)
+D 6 (#353623)
+R 4 (#78c830)
+D 4 (#6fafa3)
+R 6 (#2b0612)
+D 5 (#31fff3)
+R 7 (#8b49b2)
+D 9 (#6f0ee3)
+R 5 (#4212e0)
+D 6 (#5d11f3)
+R 6 (#648340)
+D 8 (#393743)
+R 6 (#34ddd0)
+U 8 (#346fb3)
+R 5 (#34fc22)
+D 4 (#71c453)
+R 6 (#5048f2)
+D 4 (#0bb993)
+R 4 (#42b9f0)
+D 9 (#5cdf83)
+R 5 (#42b9f2)
+D 3 (#6f3f93)
+R 3 (#3dbae2)
+D 8 (#495363)
+R 9 (#328ba2)
+D 3 (#77afa1)
+R 5 (#575710)
+D 2 (#10d861)
+R 4 (#257822)
+D 4 (#6efe61)
+R 9 (#257820)
+D 5 (#521d01)
+R 5 (#575712)
+D 6 (#494cf1)
+L 5 (#683ab2)
+D 4 (#5e79c3)
+L 3 (#4242a2)
+D 4 (#5e79c1)
+L 7 (#2c3442)
+D 8 (#2fbd23)
+L 5 (#636fb2)
+D 5 (#63bd53)
+L 2 (#299960)
+D 6 (#31ea33)
+R 3 (#51dfb0)
+D 7 (#4e4ec3)
+R 4 (#7b7912)
+D 5 (#4b4bf3)
+R 4 (#54e882)
+D 5 (#7d2193)
+R 3 (#3b77d2)
+D 3 (#826973)
+R 8 (#646ec2)
+D 4 (#076c63)
+L 10 (#674052)
+D 6 (#3676b1)
+L 9 (#3bd890)
+D 4 (#7feb71)
+L 3 (#3bd892)
+D 3 (#27fc21)
+R 8 (#66bba2)
+D 8 (#645c73)
+R 5 (#43e132)
+D 5 (#51d9e3)
+R 8 (#43e130)
+D 6 (#2827f3)
+R 4 (#412c92)
+D 5 (#7e7f63)
+L 4 (#218122)
+D 4 (#546e83)
+L 9 (#82f672)
+D 8 (#6ed383)
+L 3 (#701412)
+D 7 (#47de23)
+L 5 (#46f912)
+D 7 (#0d9ec3)
+L 4 (#515142)
+D 3 (#4699e3)
+L 9 (#2ed562)
+U 6 (#00a273)
+L 9 (#8d7d12)
+U 2 (#6c3a83)
+L 7 (#318fa2)
+U 7 (#0bd473)
+L 2 (#6d5050)
+U 10 (#415673)
+R 3 (#9e8420)
+U 6 (#1ff213)
+R 5 (#0c8bf0)
+U 2 (#479a11)
+R 6 (#977360)
+U 5 (#479a13)
+L 8 (#250680)
+U 2 (#1ff211)
+L 3 (#216630)
+U 3 (#22d143)
+L 3 (#3b4342)
+U 7 (#9d4ff3)
+L 5 (#43aca2)
+U 6 (#29efd3)
+L 3 (#5c6a12)
+D 11 (#134a73)
+L 6 (#2a0982)
+U 11 (#444723)
+L 4 (#47e2e2)
+U 4 (#6855c3)
+L 4 (#06a382)
+U 4 (#2222e3)
+R 3 (#4edc62)
+U 6 (#9a2683)
+R 6 (#131872)
+U 10 (#4f5a23)
+R 4 (#858f70)
+U 5 (#4d4823)
+L 9 (#3f73f0)
+U 3 (#46f5a3)
+L 4 (#935370)
+U 4 (#46f5a1)
+L 5 (#3ca140)
+U 6 (#07b1e3)
+L 5 (#61ecd0)
+U 5 (#654743)
+L 5 (#3cec42)
+U 6 (#30bb83)
+R 3 (#920782)
+U 6 (#1f9323)
+R 8 (#3d8aa2)
+U 8 (#7492c3)
+R 3 (#301cd2)
+U 3 (#32e2f1)
+R 4 (#6936f2)
+U 6 (#32e2f3)
+R 6 (#5112c2)
+U 7 (#535b53)
+L 10 (#61f4d0)
+U 3 (#915863)
+L 2 (#51d540)
+U 5 (#32dee1)
+L 10 (#4ec320)
+U 5 (#406bc1)
+L 2 (#1b3890)
+U 3 (#681181)
+L 6 (#35ed60)
+D 9 (#153fd3)
+L 5 (#323e30)
+U 5 (#381ad3)
+L 3 (#69a550)
+U 3 (#310f63)
+L 4 (#2cbb80)
+U 5 (#3448a3)
+R 6 (#206282)
+U 5 (#202ab1)
+L 6 (#83af82)
+U 4 (#202ab3)
+L 4 (#248d02)
+D 9 (#28a983)
+L 4 (#32cf10)
+D 7 (#249d73)
+R 4 (#2f5c70)
+D 6 (#021c93)
+L 7 (#957782)
+D 6 (#550e53)
+R 5 (#957780)
+D 6 (#50bb13)
+R 9 (#49b7f2)
+U 6 (#096e93)
+R 4 (#769452)
+D 3 (#6dc543)
+R 5 (#2ad352)
+D 7 (#167963)
+L 10 (#673682)
+D 5 (#152883)
+L 10 (#13f332)
+D 3 (#996721)
+L 4 (#4be2a2)
+D 4 (#9c2443)
+L 4 (#2b83b0)
+D 3 (#5d63b3)
+L 9 (#9cfd40)
+D 7 (#49e793)
+L 7 (#0b5422)
+D 8 (#5c51b3)
+L 2 (#6db152)
+D 4 (#215b53)
+L 3 (#38dc12)
+D 8 (#7dad01)
+L 6 (#559e22)
+D 3 (#929d23)
+L 2 (#0f7560)
+D 6 (#448d13)
+L 7 (#73a972)
+D 2 (#2221c3)
+L 3 (#73a970)
+D 5 (#53b553)
+R 10 (#513590)
+D 3 (#293c83)
+L 10 (#58e2e0)
+D 4 (#54dd21)
+L 5 (#1bcdf2)
+D 5 (#4b0b71)
+L 5 (#1bcdf0)
+U 6 (#43b811)
+L 5 (#4df1d0)
+U 6 (#36d6a3)
+R 5 (#3bfb20)
+U 5 (#75de61)
+L 5 (#1e0ec2)
+U 4 (#30b571)
+L 7 (#2dfd20)
+D 5 (#49ad61)
+L 2 (#2dfd22)
+D 11 (#715d41)
+L 3 (#1e0ec0)
+U 4 (#0f2091)
+L 4 (#9d29c0)
+U 9 (#475a73)
+L 2 (#108610)
+U 3 (#1e5423)
+L 8 (#394192)
+U 3 (#0274b3)

day18/main.go

@@ -0,0 +1,89 @@
+package main
+
+import (
+	"bufio"
+	_ "embed"
+	"fmt"
+	"strconv"
+	"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 vecsPT1 []aoc.Vector
+	var vecsPT2 []aoc.Vector
+
+	for scan.Scan() {
+		text := scan.Text()
+
+		if len(text) == 0 {
+			continue
+		}
+
+		v, color := fromLine(text)
+
+		vecsPT1 = append(vecsPT1, v)
+		vecsPT2 = append(vecsPT2, fromColor(color))
+	}
+	return &result{
+		valuePT1: findArea(vecsPT1),
+		valuePT2: findArea(vecsPT2),
+	}, nil
+}
+
+var OFFSET = map[string]aoc.Point[int]{
+	"R": {0, 1},
+	"D": {1, 0},
+	"L": {0, -1},
+	"U": {-1, 0},
+}
+var OFFSET_INDEXES = maps.Values(OFFSET)
+
+func fromLine(text string) (aoc.Vector, string) {
+	v := aoc.Vector{}
+	s, text, _ := strings.Cut(text, " ")
+	v.Offset = OFFSET[s]
+
+	s, text, _ = strings.Cut(text, " ")
+	v.Scale = aoc.Atoi(s)
+
+	_, text, _ = strings.Cut(text, "(#")
+	s, _, _ = strings.Cut(text, ")")
+	return v, s
+}
+
+func fromColor(c string) aoc.Vector {
+	scale, _ := strconv.ParseInt(c[:5], 16, 64)
+	offset := OFFSET_INDEXES[c[5]-'0']
+
+	return aoc.Vector{
+		Offset: offset,
+		Scale:  int(scale),
+	}
+}
+
+func findArea(vecs []aoc.Vector) int {
+	shoelace := []aoc.Point[int]{{0, 0}}
+	borderLength := 0
+
+	for _, vec := range vecs {
+		shoelace = append(shoelace, shoelace[len(shoelace)-1].Add(vec.Point()))
+		borderLength += vec.Scale
+	}
+
+	return aoc.NumPoints(shoelace, borderLength)
+}

day18/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, 62)
+	is.Equal(result.valuePT2, 952408144115)
+}
+
+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 < 68834) // first attempt too high.
+	is.Equal(result.valuePT1, 46334)
+	is.Equal(result.valuePT2, 102000662718092)
+}

day19/example.txt

@@ -0,0 +1,17 @@
+px{a<2006:qkq,m>2090:A,rfg}
+pv{a>1716:R,A}
+lnx{m>1548:A,A}
+rfg{s<537:gd,x>2440:R,A}
+qs{s>3448:A,lnx}
+qkq{x<1416:A,crn}
+crn{x>2662:A,R}
+in{s<1351:px,qqz}
+qqz{s>2770:qs,m<1801:hdj,R}
+gd{a>3333:R,R}
+hdj{m>838:A,pv}
+
+{x=787,m=2655,a=1222,s=2876}
+{x=1679,m=44,a=2067,s=496}
+{x=2036,m=264,a=79,s=2244}
+{x=2461,m=1339,a=466,s=291}
+{x=2127,m=1623,a=2188,s=1013}

day19/input.txt

@@ -0,0 +1,780 @@
+ztj{s<2703:A,m<1025:vk,ztl}
+nqt{a>3513:R,s>2424:R,m>929:R,A}
+mr{s>2281:R,A}
+gf{x>2746:R,a<3379:jcl,R}
+gkv{x>2579:qlx,s>322:rxv,R}
+gdl{x<2917:A,s>82:A,s<54:R,R}
+hzc{m<1277:R,m>1355:A,x>953:A,R}
+xs{x>2337:ft,m>1444:A,R}
+hs{m<235:A,a<2424:A,x<3026:pvh,hqk}
+cls{a<1361:zch,s<3630:tnh,a<2359:px,spb}
+gq{m<1157:A,R}
+hc{m<2726:A,s>1302:A,R}
+lt{x>3157:A,a<3669:R,R}
+sf{x<3199:R,s>2680:jrl,x>3718:jh,R}
+hr{m>1737:A,A}
+bgg{x<171:A,x<283:R,R}
+pgb{m<1624:ksc,x>2675:bzc,bzn}
+zm{m<2599:sjc,m>3497:A,m<2946:A,A}
+gbb{x>860:bxv,a<2306:br,msc}
+gsl{x>53:A,A}
+zs{x<1669:kp,x<2690:ns,s>2951:cls,tvv}
+qhq{x<1264:A,m<1728:A,R}
+gg{s<239:A,s>340:R,x>3642:A,R}
+ktx{m>2620:R,m>2073:R,a<3539:R,R}
+xg{x<3497:fp,sgc}
+pms{m<3366:R,x>3570:A,R}
+gsb{x>2077:A,A}
+xf{s>3779:A,R}
+tfs{s>3844:rb,s<3703:scg,bk}
+bgb{a>2837:R,a>2812:A,A}
+nvk{s<2358:mr,x>2818:nqt,x<2757:lf,R}
+fg{a>1961:A,x<68:R,R}
+cfz{x>1567:A,m>951:A,a<2959:R,A}
+ljt{m>950:A,m<557:R,m<745:A,R}
+zcq{m>1403:th,fd}
+tbv{a>1532:R,R}
+dq{m>960:R,csz}
+tvv{a<2619:zh,m>1623:kb,vh}
+dzz{s>3136:R,s<2702:A,a>2889:R,R}
+lg{a<66:A,s>784:A,s>263:A,A}
+zfk{s<463:R,x>3180:A,R}
+bdh{s>356:A,s>193:A,m>482:R,R}
+tc{m>3454:R,x>3211:A,A}
+tz{x>3191:R,a<1319:R,R}
+cpn{m<2478:A,a<2228:A,a>3262:A,A}
+qmt{x<2144:R,flt}
+nsp{m<379:R,R}
+sxt{s<1011:A,a>1135:A,rl}
+bjg{m>973:lz,x>243:hh,a>1789:xl,xmg}
+cj{x>2137:nst,m<3002:A,s>3193:jc,pfr}
+lmc{a>2967:A,A}
+tv{m>1493:A,m<769:A,R}
+khc{m>2346:mbr,s>596:kvr,a<274:fzh,tb}
+zbk{s>1140:qrt,x>1818:pv,a>540:gt,gxc}
+kk{s>3728:R,s>3683:R,m<562:A,A}
+jv{m<848:zpq,a>1225:fsv,ztj}
+shb{a<242:A,m>2625:R,R}
+fhg{m>1372:R,A}
+dg{x>1246:qd,s<3289:lbf,a<1032:zzp,ks}
+cfq{s>2689:A,s>2613:R,A}
+gl{m>2798:cqm,s>3029:cnl,m>2233:A,qc}
+tkv{m<1884:A,A}
+fdm{m<1549:tgt,x<2498:kdf,s>528:jz,lt}
+vx{x<2948:xc,mgp}
+bs{m<687:A,R}
+kp{x>609:dkr,tqc}
+xpj{x<934:A,a>1772:A,A}
+rhd{x>956:A,a<2471:A,a<3414:A,A}
+srg{m>1381:A,s<264:A,A}
+szv{s>453:mff,nzj}
+ldl{a>3906:A,A}
+rxv{m<1632:R,m>1700:R,R}
+ch{s<3588:A,a<639:A,R}
+sc{s>2789:A,a<1419:R,R}
+gk{m>415:R,x>508:A,a<3053:R,R}
+rs{s<1893:R,m>2997:R,x<2049:R,R}
+ncn{s<722:R,m>3562:A,s>773:jm,vr}
+kz{x>3160:A,A}
+xxt{s>1035:R,a<942:R,R}
+pfr{m<3520:A,A}
+nh{a<638:mv,s>865:vm,nrf}
+sg{s>3051:vps,m>2918:A,zhs}
+xnj{x>3494:A,m>584:A,a<1897:A,R}
+jg{s<2380:R,a<2211:A,A}
+cqm{s<3107:R,a>3295:R,m>3224:R,A}
+hgv{m<203:A,s>107:R,A}
+vqt{x<2609:xkn,bnt}
+ft{s>3154:A,m>1087:R,A}
+qv{a>621:A,a>259:xp,m<2439:fbv,kpq}
+lzv{x<2186:gpt,lsb}
+lx{x>3655:A,s>2359:A,s>2271:R,R}
+xfj{s<407:sxx,R}
+tnh{x<3164:vx,js}
+mbr{s<671:A,R}
+tbn{m<2151:A,x<3001:R,R}
+zhp{m<3768:fgp,x>3307:rv,kj}
+qd{s<3201:A,s>3491:hgt,x>1468:A,R}
+qdk{s<1950:R,R}
+vn{s>2814:A,m>386:A,A}
+lv{x>3090:A,s>2406:znh,R}
+km{m>2029:A,m>1871:A,s<2456:A,R}
+ppc{m>2718:R,x<2889:A,x>3361:A,R}
+bk{a<3189:A,m>846:R,R}
+ht{s>2582:jts,x<3333:hx,rgx}
+bb{x<3122:A,x>3258:R,m>3625:A,A}
+fd{m>650:R,x<450:A,a<2254:gb,gk}
+dcf{s>1084:tzp,gbb}
+pm{x>3659:A,m<3539:R,A}
+hj{a>3260:hrn,A}
+ds{m>767:A,m>718:A,R}
+ccv{a<2781:R,a<2905:hd,s<1781:A,qdk}
+vh{s<2473:lpg,m>643:cmn,s>2647:vkk,ht}
+zld{x<3737:A,xst}
+djf{x<748:R,R}
+jfx{m>1768:gz,m>802:jfs,m<437:cl,snl}
+vft{x<2121:dn,m<2486:kf,x<2180:qmt,vsj}
+bc{m<369:hs,a<2050:dfd,m>584:mx,vqt}
+dn{a<799:vbr,m<1868:A,s<1387:skb,rs}
+kxl{a<1795:A,s>3664:A,s<3514:R,R}
+bh{x>3971:A,R}
+pv{x>1877:R,s<517:R,m>2313:R,A}
+vzj{s<1879:cth,vc}
+fc{a<2156:ths,zbc}
+cs{a>2745:A,x>2067:A,s>2357:R,A}
+nsj{a>2800:A,m<2010:R,R}
+lsb{a>2810:R,x>2463:A,m>2877:R,bz}
+nl{x<2336:A,x>2529:A,A}
+pk{m<2800:A,s>3027:R,x<487:A,A}
+bzn{m<1838:R,A}
+qrt{s>1765:R,s>1529:A,s>1302:zdc,kzp}
+srn{m<3131:zbr,a>3269:phc,x<2610:R,xd}
+lz{m<1282:pzk,s>1085:gld,A}
+spb{x<3144:krj,sx}
+mqz{m>467:sm,m<282:R,s<969:hhs,jfp}
+mff{s<632:A,x>625:R,dzt}
+hgt{m<2577:A,s<3667:A,s>3805:R,R}
+xpv{a<3077:R,R}
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+jtt{a<3836:zqv,m<876:gg,A}
+lmr{a<2718:A,a<3149:R,R}
+zdv{s>3010:R,lr}
+jcl{m<1659:A,R}
+mdq{a<479:R,A}
+dnp{m<537:pht,s<885:qp,x<582:bjg,kjt}
+lxp{m>2932:A,lx}
+kqx{s<513:hbk,a<1592:ncn,a>3119:xrc,kt}
+cnl{x<1035:R,m<2338:A,R}
+mp{m<2347:xpj,a>2221:vdz,bq}
+rgx{s<2542:R,R}
+rb{s<3903:A,A}
+jk{m>2376:R,x>3391:R,m<1198:R,R}
+zgm{s>3092:bzj,sz}
+gt{a>1014:R,m<2365:ls,R}
+jpn{s>1819:hj,a>3326:vqr,ljm}
+nzj{s>254:R,m>2156:R,x<991:jf,qhq}
+gh{m>856:A,nsp}
+kpq{a<110:A,x>3312:R,x<3090:R,R}
+hl{x<3177:pj,bp}
+gs{a<180:R,s>3703:R,R}
+gz{m>3188:R,R}
+lft{s>2829:ps,gbj}
+kzb{m>2754:A,a<2674:A,A}
+vz{a>2453:pp,clg}
+tqc{x<360:dk,zcq}
+bxv{a<2317:A,m<2884:pn,fkp}
+ztl{a<590:R,x<2295:R,x>2529:R,R}
+vkk{a>3382:zc,x>3140:xrl,m<384:lft,rql}
+fbv{s<3805:R,s>3881:R,a>172:R,R}
+gbq{m>279:A,x<3717:R,x<3898:A,R}
+svn{s<1485:R,A}
+skb{s>589:R,s>295:R,x>2063:A,A}
+mc{a>272:A,x>3488:gs,s>3786:A,fsf}
+pbv{x<3811:R,a>3290:A,m<3444:R,A}
+gkn{s<1377:A,A}
+nth{a<1084:bd,A}
+vsl{a<2799:A,a<2901:bgb,fph}
+lr{x<1407:A,s>2654:R,s<2373:A,R}
+dbq{m<1824:R,s>291:R,A}
+hdt{s>3011:R,s>2681:A,bgg}
+nvq{m>597:R,x>47:R,A}
+qj{s>674:pz,s>313:srn,ntb}
+fgp{a>3257:R,mcl}
+pjd{s<3848:vlx,A}
+gmf{s<1729:A,A}
+kzp{x>1746:A,x>1670:A,m>2460:A,A}
+tl{m<888:A,m<1289:A,R}
+zh{m<1334:fzz,s>2674:vj,m<2347:cdt,cx}
+ql{s<1432:A,a>258:R,A}
+rch{s<485:R,vqq}
+hf{a<3208:R,pf}
+bj{x<2870:R,m<2489:A,R}
+zhg{x>3190:A,s>144:R,m<2941:A,R}
+rsh{x<3060:R,a<1833:pm,R}
+ntt{a>1930:R,a<1611:A,A}
+hd{s>1811:A,R}
+dfd{x<2726:A,qg}
+gqd{a>3471:qjt,qhl}
+xrl{x>3598:khp,m>284:lbp,m<100:R,xq}
+zxz{m<2818:A,R}
+vfn{s>1502:R,x>955:R,s>1440:A,R}
+dr{s<370:A,x>3070:R,R}
+cth{a<2210:cxk,a>3174:lhc,krr}
+xbr{m<1775:R,m>3200:A,A}
+nn{m>718:R,x>3641:nx,A}
+dxn{s<55:hr,x>3309:A,a<824:kcd,mqc}
+mt{a<423:R,a>555:R,R}
+hqk{a>2663:A,s<888:R,a<2564:R,A}
+ns{a<2307:lrn,qdj}
+sxb{s>318:vg,hgv}
+ljm{s<1457:A,m>763:A,s>1648:R,A}
+qcr{s<1460:R,m<548:hms,a>1054:A,nzq}
+sxx{a>3455:A,R}
+
+{x=378,m=450,a=211,s=36}
+{x=220,m=1090,a=338,s=879}
+{x=117,m=124,a=2136,s=128}
+{x=1392,m=1408,a=126,s=16}
+{x=2038,m=278,a=901,s=1801}
+{x=323,m=1703,a=964,s=571}
+{x=265,m=358,a=456,s=34}
+{x=1513,m=144,a=525,s=1341}
+{x=355,m=2036,a=814,s=1179}
+{x=937,m=701,a=2026,s=1349}
+{x=1292,m=766,a=2805,s=16}
+{x=319,m=26,a=83,s=1193}
+{x=600,m=5,a=242,s=76}
+{x=117,m=1415,a=1636,s=1057}
+{x=87,m=1530,a=1686,s=386}
+{x=36,m=957,a=1712,s=300}
+{x=2570,m=49,a=661,s=442}
+{x=643,m=698,a=1593,s=854}
+{x=1450,m=1410,a=289,s=1342}
+{x=1690,m=376,a=584,s=3715}
+{x=1942,m=570,a=1726,s=1192}
+{x=420,m=475,a=1410,s=863}
+{x=550,m=662,a=2140,s=105}
+{x=241,m=2370,a=756,s=26}
+{x=705,m=425,a=1000,s=160}
+{x=1763,m=914,a=197,s=555}
+{x=2267,m=323,a=70,s=147}
+{x=497,m=392,a=1959,s=360}
+{x=428,m=1375,a=415,s=236}
+{x=1800,m=96,a=403,s=1227}
+{x=216,m=381,a=1217,s=1031}
+{x=3129,m=304,a=811,s=1753}
+{x=555,m=59,a=3254,s=2896}
+{x=397,m=1518,a=740,s=496}
+{x=905,m=217,a=1234,s=2319}
+{x=283,m=2490,a=309,s=1156}
+{x=1777,m=624,a=96,s=2053}
+{x=1031,m=481,a=1014,s=198}
+{x=155,m=205,a=2460,s=832}
+{x=123,m=25,a=3962,s=3662}
+{x=3242,m=396,a=519,s=150}
+{x=2632,m=1307,a=3594,s=1714}
+{x=147,m=285,a=1020,s=40}
+{x=1498,m=1133,a=241,s=1263}
+{x=1977,m=323,a=1594,s=241}
+{x=807,m=1042,a=702,s=295}
+{x=70,m=455,a=1328,s=108}
+{x=2392,m=27,a=158,s=44}
+{x=528,m=671,a=2003,s=935}
+{x=1539,m=2002,a=168,s=479}
+{x=2121,m=195,a=901,s=1116}
+{x=251,m=51,a=380,s=745}
+{x=793,m=1959,a=598,s=605}
+{x=137,m=261,a=714,s=1548}
+{x=2783,m=486,a=2065,s=914}
+{x=574,m=387,a=250,s=28}
+{x=3,m=829,a=1862,s=2}
+{x=846,m=2476,a=841,s=1810}
+{x=1020,m=114,a=463,s=323}
+{x=4,m=970,a=192,s=142}
+{x=942,m=2297,a=125,s=1638}
+{x=1664,m=2275,a=2086,s=290}
+{x=682,m=93,a=143,s=2033}
+{x=1613,m=356,a=463,s=632}
+{x=633,m=268,a=150,s=798}
+{x=1743,m=1455,a=56,s=487}
+{x=2774,m=103,a=739,s=77}
+{x=1760,m=2631,a=81,s=138}
+{x=461,m=1688,a=1543,s=1712}
+{x=1182,m=14,a=566,s=3270}
+{x=680,m=467,a=1920,s=297}
+{x=1281,m=2355,a=704,s=1340}
+{x=142,m=65,a=589,s=20}
+{x=1412,m=559,a=677,s=2106}
+{x=905,m=2761,a=1526,s=648}
+{x=399,m=667,a=1901,s=27}
+{x=2241,m=3411,a=1786,s=321}
+{x=1395,m=1278,a=508,s=1112}
+{x=363,m=35,a=218,s=1280}
+{x=829,m=115,a=304,s=192}
+{x=1397,m=599,a=861,s=838}
+{x=824,m=2140,a=88,s=1736}
+{x=661,m=276,a=502,s=731}
+{x=585,m=14,a=705,s=473}
+{x=747,m=95,a=829,s=805}
+{x=2006,m=323,a=982,s=168}
+{x=795,m=193,a=473,s=1531}
+{x=687,m=428,a=972,s=1154}
+{x=254,m=426,a=281,s=552}
+{x=171,m=369,a=382,s=1369}
+{x=964,m=10,a=322,s=2007}
+{x=1960,m=183,a=2153,s=1967}
+{x=2315,m=170,a=41,s=727}
+{x=189,m=901,a=307,s=3026}
+{x=757,m=1235,a=1316,s=335}
+{x=836,m=3023,a=453,s=2355}
+{x=2187,m=2140,a=683,s=2560}
+{x=1772,m=468,a=1812,s=1329}
+{x=783,m=601,a=1339,s=3291}
+{x=570,m=172,a=1794,s=120}
+{x=1207,m=1572,a=700,s=758}
+{x=1961,m=3652,a=702,s=153}
+{x=1094,m=435,a=19,s=938}
+{x=3328,m=166,a=247,s=216}
+{x=1500,m=2012,a=1561,s=59}
+{x=12,m=2269,a=8,s=796}
+{x=193,m=1137,a=328,s=13}
+{x=120,m=1179,a=59,s=1829}
+{x=499,m=650,a=1049,s=1803}
+{x=2761,m=1431,a=389,s=1322}
+{x=456,m=2766,a=2165,s=348}
+{x=2387,m=12,a=2140,s=556}
+{x=387,m=7,a=1514,s=1137}
+{x=1111,m=608,a=581,s=965}
+{x=1055,m=181,a=754,s=67}
+{x=74,m=2582,a=66,s=546}
+{x=5,m=956,a=1013,s=657}
+{x=262,m=189,a=2496,s=233}
+{x=518,m=2821,a=851,s=825}
+{x=351,m=1981,a=221,s=34}
+{x=995,m=165,a=36,s=2286}
+{x=1636,m=335,a=936,s=447}
+{x=763,m=692,a=1527,s=210}
+{x=301,m=559,a=1815,s=2640}
+{x=959,m=2852,a=232,s=53}
+{x=136,m=153,a=206,s=11}
+{x=1533,m=42,a=2014,s=136}
+{x=341,m=378,a=37,s=577}
+{x=220,m=1451,a=185,s=421}
+{x=1086,m=3265,a=1184,s=2960}
+{x=143,m=2701,a=602,s=173}
+{x=628,m=1016,a=1642,s=223}
+{x=597,m=641,a=1331,s=651}
+{x=809,m=1843,a=1111,s=2189}
+{x=1385,m=1352,a=238,s=1969}
+{x=515,m=1374,a=125,s=913}
+{x=798,m=2743,a=1798,s=1045}
+{x=2999,m=1787,a=1168,s=188}
+{x=57,m=77,a=2652,s=56}
+{x=1231,m=304,a=1288,s=523}
+{x=1031,m=381,a=558,s=267}
+{x=721,m=883,a=2995,s=22}
+{x=304,m=846,a=1525,s=30}
+{x=446,m=2969,a=412,s=674}
+{x=187,m=418,a=1187,s=571}
+{x=810,m=515,a=819,s=1393}
+{x=740,m=3392,a=1128,s=1114}
+{x=137,m=631,a=1208,s=1707}
+{x=653,m=2468,a=952,s=811}
+{x=33,m=70,a=518,s=464}
+{x=3318,m=2,a=3661,s=64}
+{x=50,m=548,a=1657,s=704}
+{x=2272,m=2684,a=1597,s=2220}
+{x=185,m=339,a=460,s=517}
+{x=8,m=1651,a=1810,s=354}
+{x=548,m=833,a=1703,s=759}
+{x=551,m=358,a=390,s=468}
+{x=202,m=2260,a=597,s=632}
+{x=453,m=1811,a=754,s=2449}
+{x=353,m=101,a=1835,s=72}
+{x=1451,m=453,a=162,s=13}
+{x=125,m=2120,a=627,s=981}
+{x=5,m=283,a=1755,s=194}
+{x=973,m=835,a=62,s=1184}
+{x=346,m=1348,a=442,s=210}
+{x=4,m=1242,a=136,s=196}
+{x=2388,m=1336,a=1991,s=2873}
+{x=561,m=2335,a=1059,s=627}
+{x=838,m=3226,a=159,s=1053}
+{x=2578,m=49,a=1920,s=2432}
+{x=710,m=342,a=182,s=534}
+{x=1997,m=1509,a=946,s=1849}
+{x=810,m=249,a=495,s=257}
+{x=363,m=274,a=2742,s=25}
+{x=506,m=565,a=2584,s=731}
+{x=508,m=2073,a=21,s=1826}
+{x=1413,m=780,a=779,s=378}
+{x=1097,m=47,a=98,s=402}
+{x=536,m=2,a=2710,s=1499}
+{x=548,m=2845,a=2095,s=555}
+{x=2963,m=2206,a=1920,s=875}
+{x=1783,m=367,a=1245,s=594}
+{x=409,m=18,a=408,s=119}
+{x=1554,m=3613,a=3002,s=87}
+{x=232,m=197,a=63,s=1372}
+{x=412,m=1355,a=1673,s=1667}
+{x=261,m=142,a=123,s=1187}
+{x=1396,m=779,a=287,s=60}
+{x=28,m=1350,a=585,s=861}
+{x=1123,m=329,a=1166,s=62}
+{x=2292,m=73,a=123,s=596}
+{x=2400,m=1430,a=390,s=1313}
+{x=638,m=2856,a=44,s=488}
+{x=294,m=1534,a=1075,s=1914}
+{x=1233,m=71,a=253,s=3058}
+{x=1536,m=805,a=158,s=738}
+{x=2903,m=119,a=2344,s=2387}
+{x=142,m=1768,a=940,s=881}
+{x=301,m=2748,a=739,s=766}
+{x=127,m=18,a=141,s=1398}

day19/main.go

@@ -0,0 +1,255 @@
+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 uint
+}
+
+func (r result) String() string { return fmt.Sprintf("%#v", r) }
+
+func run(scan *bufio.Scanner) (*result, error) {
+
+	var workflows = make(map[string][]rule)
+	var parts []part
+
+	for scan.Scan() {
+		text := strings.TrimSuffix(scan.Text(), "}")
+		if len(text) == 0 {
+			continue
+		}
+
+		// Is Part
+		if p, ok := scanPart(text); ok {
+			parts = append(parts, p)
+			continue
+		}
+
+		if name, r, ok := scanRule(text); ok {
+			workflows[name] = r
+		}
+	}
+
+	var result result
+	result.valuePT1 = solveWorkflow(parts, workflows)
+	result.valuePT2 = solveRanges(workflows)
+
+	return &result, nil
+}
+
+type part struct {
+	x, m, a, s int
+}
+
+func (p part) String() string {
+	return fmt.Sprintf("{x:%v m:%v a:%v s:%v}", p.x, p.m, p.a, p.s)
+}
+func scanPart(text string) (part, bool) {
+	var p part
+
+	// Is Part
+	if text[0] == '{' {
+		for _, s := range strings.Split(text[1:], ",") {
+			a, b, _ := strings.Cut(s, "=")
+			i := aoc.Atoi(b)
+			switch a {
+			case "x":
+				p.x = i
+			case "m":
+				p.m = i
+			case "a":
+				p.a = i
+			case "s":
+				p.s = i
+			}
+		}
+		return p, true
+	}
+	return p, false
+}
+
+type rule struct {
+	match string
+	op    string
+	value int
+	queue string
+}
+
+func scanRule(text string) (string, []rule, bool) {
+	name, text, _ := strings.Cut(text, "{")
+	var r []rule
+	for _, s := range strings.Split(text, ",") {
+		if a, b, ok := strings.Cut(s, "<"); ok {
+			b, c, _ := strings.Cut(b, ":")
+			r = append(r, rule{
+				match: a,
+				op:    "<",
+				value: aoc.Atoi(b),
+				queue: c,
+			})
+
+			continue
+		}
+		if a, b, ok := strings.Cut(s, ">"); ok {
+			b, c, _ := strings.Cut(b, ":")
+			r = append(r, rule{
+				match: a,
+				op:    ">",
+				value: aoc.Atoi(b),
+				queue: c,
+			})
+			continue
+		}
+
+		// default queue comes last
+		r = append(r, rule{queue: s})
+		break
+	}
+	return name, r, len(r) > 0
+}
+func (r rule) Match(p part) bool {
+	var value int
+
+	switch r.match {
+	case "x":
+		value = p.x
+	case "m":
+		value = p.m
+	case "a":
+		value = p.a
+	case "s":
+		value = p.s
+	default:
+		return true // default to new queue
+	}
+
+	if r.op == ">" && value > r.value {
+		return true
+	} else if r.op == "<" && value < r.value {
+		return true
+	}
+	return false // no match
+}
+
+func solveWorkflow(parts []part, workflows map[string][]rule) int {
+	// var rejected []part
+	var accepted []part
+
+	for _, p := range parts {
+		workflow := "in"
+
+	nextStep:
+		for workflow != "" {
+			for _, r := range workflows[workflow] {
+				if !r.Match(p) {
+					continue
+				}
+				workflow = r.queue
+
+				if workflow == "A" {
+					accepted = append(accepted, p)
+					workflow = ""
+					break nextStep
+				}
+				if workflow == "R" {
+					// rejected = append(rejected, p)
+					workflow = ""
+					break nextStep
+				}
+
+				continue nextStep
+			}
+		}
+	}
+
+	sum := 0
+	for _, p := range accepted {
+		sum += p.x
+		sum += p.m
+		sum += p.a
+		sum += p.s
+	}
+	return sum
+}
+
+func solveRanges(workflows map[string][]rule) uint {
+
+	pq := aoc.PriorityQueue(func(a, b *queue) bool { return false })
+	pq.Insert(&queue{
+		"in",
+		block{
+			ranger{1, 4000},
+			ranger{1, 4000},
+			ranger{1, 4000},
+			ranger{1, 4000},
+		}})
+
+	var accepted []block
+	// var rejected []block
+
+	for !pq.IsEmpty() {
+		current := pq.ExtractMin()
+		for _, rule := range workflows[current.name] {
+			next := &queue{name: rule.queue, block: current.block}
+
+			switch rule.match {
+			case "x":
+				current.x, next.x = split(current.x, rule.value, rule.op == ">")
+			case "m":
+				current.m, next.m = split(current.m, rule.value, rule.op == ">")
+			case "a":
+				current.a, next.a = split(current.a, rule.value, rule.op == ">")
+			case "s":
+				current.s, next.s = split(current.s, rule.value, rule.op == ">")
+			}
+
+			switch next.name {
+			case "R":
+				// rejected = append(rejected, next.block)
+
+			case "A":
+				accepted = append(accepted, next.block)
+
+			default:
+				pq.Insert(next)
+			}
+		}
+	}
+
+	var sum uint
+	for _, a := range accepted {
+		sum += uint((a.x[1] - a.x[0] + 1) * (a.m[1] - a.m[0] + 1) * (a.a[1] - a.a[0] + 1) * (a.s[1] - a.s[0] + 1))
+	}
+
+	return sum
+}
+
+type ranger [2]int
+type block struct {
+	x, m, a, s ranger
+}
+type queue struct {
+	name string
+	block
+}
+
+func split(a ranger, n int, gt bool) (current ranger, next ranger) {
+	if gt { // x > N => [0,N] [N++,inf]
+		return ranger{a[0], n}, ranger{n + 1, a[1]}
+	}
+
+	// x < N => [N,inf] [0,N--]
+	return ranger{n, a[1]}, ranger{a[0], n - 1}
+}

day19/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, 19114)
+	is.Equal(result.valuePT2, uint(167409079868000))
+}
+
+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, 377025)
+	is.Equal(result.valuePT2, uint(135506683246673))
+}

go.mod

@@ -1,8 +1,6 @@
 module go.sour.is/advent-of-code
 
-go 1.21.4
-
-toolchain go1.21.5
+go 1.22.0
 
 require (
 	github.com/matryer/is v1.4.1

grids.go

@@ -0,0 +1,246 @@
+package aoc
+
+import (
+	"cmp"
+	"fmt"
+	"sort"
+	"strings"
+
+	"golang.org/x/exp/maps"
+)
+
+type Vector struct {
+	Offset Point[int]
+	Scale  int
+}
+
+func (v Vector) Point() Point[int] {
+	return v.Offset.Scale(v.Scale)
+}
+
+type Point[T integer] [2]T
+
+func (p Point[T]) Add(a Point[T]) Point[T] {
+	return Point[T]{p[0] + a[0], p[1] + a[1]}
+}
+func (p Point[T]) Scale(m T) Point[T] {
+	return Point[T]{p[0] * m, p[1] * m}
+}
+func (p Point[T]) Less(b Point[T]) bool {
+	if p[0] != b[0] {
+		return p[0] < b[0]
+	}
+	return p[1] < b[1]
+}
+
+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
+}
+
+// NumPoints the number of the points inside an outline plus the number of points in the outline
+func NumPoints(outline []Point[int], borderLength int) int {
+	// shoelace - find the float area in a shape
+	sum := 0
+	for _, p := range Pairwise(outline) {
+		row1, col1 := p[0][0], p[0][1]
+		row2, col2 := p[1][0], p[1][1]
+
+		sum += row1*col2 - row2*col1
+	}
+	area := sum / 2
+
+	// pick's theorem - find the number of points in a shape given its area
+	return (ABS(area) - borderLength/2 + 1) + borderLength
+}
+
+type Map[I integer, T any] [][]T
+
+func (m *Map[I, T]) Get(p Point[I]) (Point[I], T, bool) {
+	var zero T
+	if !m.Valid(p) {
+		return [2]I{0, 0}, zero, false
+	}
+
+	return p, (*m)[p[0]][p[1]], true
+}
+func (m *Map[I, T]) Size() (I, I) {
+	if m == nil || len(*m) == 0 {
+		return 0, 0
+	}
+	return I(len(*m)), I(len((*m)[0]))
+}
+func (m *Map[I, T]) Valid(p Point[I]) bool {
+	rows, cols := m.Size()
+	return p[0] >= 0 && p[0] < rows && p[1] >= 0 && p[1] < cols
+}
+
+type cmap[C number, N comparable] struct {
+	base      pather[C, N]
+	neighbors map[N]map[N]C
+}
+
+func (m *cmap[C, N]) Cost(a, b N) C {
+	if v, ok := m.neighbors[a]; ok {
+		return v[b]
+	}
+	return 0
+}
+func (m *cmap[C, N]) Neighbors(n N) []N {
+	if v, ok := m.neighbors[n]; ok {
+		return maps.Keys(v)
+	}
+	return nil
+}
+func (m *cmap[C, N]) Target(n N, c C) bool {
+	return m.base.Target(n, c)
+}
+func (m *cmap[C, N]) String() string {
+	var b = &strings.Builder{}
+
+	for k, nbs := range m.neighbors {
+		fmt.Fprintln(b, k)
+		for to, c := range nbs {
+			fmt.Fprintln(b, "  ", to, c)
+		}
+	}
+
+	return b.String()
+}
+
+func CompressMap[C number, N comparable](p pather[C, N], start N) pather[C, N] {
+	var next = []N{start}
+	var visited = make(map[N]map[N]C)
+
+	var n N
+	for len(next) > 0 {
+		n, next = next[len(next)-1], next[:len(next)-1]
+
+		if _, ok := visited[n]; ok {
+			continue
+		}
+
+		nbs := p.Neighbors(n)
+		if len(nbs) == 2 {
+			a, b := nbs[0], nbs[1]
+			if to, ok := visited[a]; ok {
+				to[b] = to[n] + p.Cost(n, b)
+				delete(to, n)
+				visited[a] = to
+			} else if to, ok := visited[b]; ok {
+				to[a] = to[n] + p.Cost(n, a)
+				delete(to, n)
+				visited[b] = to
+			}
+			continue
+		}
+
+		visited[n] = make(map[N]C)
+		next = append(next, nbs...)
+		for _, to := range nbs {
+			visited[n][to] = p.Cost(n, to)
+		}
+	}
+
+	return &cmap[C, N]{base: p, neighbors: visited}
+}
+
+type adjacencyList[V any, C comparable] map[C][]V
+type graph[V any, W cmp.Ordered, C comparable] map[C]*vertex[V, W]
+type graphOption[V any, W cmp.Ordered, C comparable] func(g *graph[V, W, C])
+type vertex[V any, W cmp.Ordered] struct {
+	Value V
+	Edges edges[V, W]
+}
+
+func (v *vertex[V, W]) Neighbors() []V {
+	var nbs []V
+	sort.Sort(v.Edges)
+	for _, e := range v.Edges {
+		nbs = append(nbs, e.Vertex.Value)
+	}
+	return nbs
+}
+
+type edge[V any, W cmp.Ordered] struct {
+	Vertex *vertex[V, W]
+	Weight W
+}
+type edges[V any, W cmp.Ordered] []edge[V, W]
+
+func (e edges[V, W]) Len() int           { return len(e) }
+func (e edges[V, W]) Less(i, j int) bool { return e[i].Weight < e[j].Weight }
+func (e edges[V, W]) Swap(i, j int)      { e[i], e[j] = e[j], e[i] }
+
+func Graph[V any, W cmp.Ordered, C comparable](opts ...graphOption[V, W, C]) *graph[V, W, C] {
+	g := make(graph[V, W, C])
+	for _, opt := range opts {
+		opt(&g)
+	}
+	return &g
+}
+func (g *graph[V, W, C]) AddVertex(id C, value V) {
+	(*g)[id] = &vertex[V, W]{Value: value}
+}
+func (g *graph[V, W, C]) AddEdge(from, to C, w W) {
+	if g == nil {
+		return
+	}
+	if _, ok := (*g)[from]; !ok {
+		return
+	}
+	if _, ok := (*g)[to]; !ok {
+		return
+	}
+
+	(*g)[from].Edges = append((*g)[from].Edges, edge[V, W]{(*g)[to], w})
+}
+func (g *graph[V, W, C]) Neighbors(v C) []V {
+	if g == nil {
+		return nil
+	}
+
+	return (*g)[v].Neighbors()
+}
+func (g *graph[V, W, C]) AdjacencyList() adjacencyList[V, C] {
+	m := make(map[C][]V)
+	for id, v := range *g {
+		if len(v.Edges) == 0 {
+			continue
+		}
+		m[id] = v.Neighbors()
+	}
+	return m
+}
+
+func WithAdjacencyList[W cmp.Ordered, C comparable](list adjacencyList[C, C]) graphOption[C, W, C] {
+	var zeroW W
+	return func(g *graph[C, W, C]) {
+		for vertex, edges := range list {
+			if _, ok := (*g)[vertex]; !ok {
+				g.AddVertex(vertex, vertex)
+			}
+
+			// add edges to vertex
+			for _, edge := range edges {
+				// add edge as vertex, if not added
+				if _, ok := (*g)[edge]; !ok {
+					g.AddVertex(edge, edge)
+				}
+
+				g.AddEdge(vertex, edge, zeroW) // no weights in this adjacency list
+			}
+		}
+	}
+}

hacker01/hacker.go

@@ -0,0 +1,69 @@
+package main
+
+import "fmt"
+import "os"
+import "bufio"
+import "strconv"
+import "strings"
+
+
+var input1 = strings.NewReader(`
+6
+1 2 5 3 6 4
+`)
+
+var input2 = strings.NewReader(`
+15
+1 14 3 7 4 5 15 6 13 10 11 2 12 8 9
+`)
+
+var input3 = os.Stdin
+
+func main() {
+	var length int
+    var tree *node
+    
+    scanner := bufio.NewScanner(input1)
+    for scanner.Scan() {
+		if length == 0 {
+			length, _ = strconv.Atoi(scanner.Text())
+			continue
+		}
+
+        for _, txt := range strings.Fields(scanner.Text()) {		
+			if v, err := strconv.Atoi(txt); err == nil {
+                tree = insert(tree, &node{value: v})
+            }
+        }
+    }
+
+    foo(input{1, "hi"})
+    
+    fmt.Println(tree)
+}
+
+type node struct {
+    value int
+    left *node
+    right *node
+}
+
+func insert(root, n *node) *node {
+        if root == nil {
+            return n
+        }
+        if root.value > n.value {
+            root.left = insert(root.left, n)
+            return root
+        }
+        root.right = insert(root.right, n)
+        return root
+}
+
+func (n *node) String() string {
+    if n == nil { return "" }
+    return fmt.Sprintf("%v %v%v", n.value, n.left.String(), n.right.String())
+}
+
+type input struct{a int; b string}
+func foo (in input) {}

hacker02/hacker.go

@@ -0,0 +1,109 @@
+package main
+
+import (
+	"bufio"
+	"fmt"
+	"io"
+	"os"
+	"strconv"
+	"strings"
+
+	aoc "go.sour.is/advent-of-code"
+)
+
+/*
+ * Complete the 'cookies' function below.
+ *
+ * The function is expected to return an INTEGER.
+ * The function accepts following parameters:
+ *  1. INTEGER k
+ *  2. INTEGER_ARRAY A
+ */
+
+func cookies(k int32, A []int32) int32 {
+	var i int32
+	// fmt.Println(" ", A)
+	// sort.Slice(A, func(i, j int) bool { return A[j] < A[i]})
+	// for A[len(A)-1] < k {
+	//     if len(A) < 2 {
+	//         return -1
+	//     }
+	//     // fmt.Println(" ", A[len(A)-1], " + 2x", A[len(A)-2], 2*A[len(A)-2] + A[len(A)-1])
+	//     A[len(A)-2] = 2*A[len(A)-2] + A[len(A)-1]
+	//     A = A[:len(A)-1]
+
+	//     for j:=len(A)-1; j>0 && A[j] > A[j-1]; j-- {
+	//         A[j], A[j-1] = A[j-1], A[j]
+	//     }
+	//     i++
+	//     fmt.Println("A", len(A), i)
+	// }
+
+	pq := aoc.FibHeap(func(a, b *int32) bool { return *a < *b })
+	for i := range A {
+		pq.Insert(&A[i])
+	}
+	for !pq.IsEmpty() && *pq.GetMin() < k {
+		first := *pq.ExtractMin()
+		second := *pq.ExtractMin()
+		third := first + 2*second
+
+		pq.Insert(&third)
+		i++
+	}
+
+	return i
+}
+
+func main() {
+	reader := bufio.NewReaderSize(os.Stdin, 16*1024*1024)
+
+	stdout, err := os.Create("/dev/stderr")
+	checkError(err)
+
+	defer stdout.Close()
+
+	writer := bufio.NewWriterSize(stdout, 16*1024*1024)
+
+	firstMultipleInput := strings.Split(strings.TrimSpace(readLine(reader)), " ")
+
+	nTemp, err := strconv.ParseInt(firstMultipleInput[0], 10, 64)
+	checkError(err)
+	n := int32(nTemp)
+
+	kTemp, err := strconv.ParseInt(firstMultipleInput[1], 10, 64)
+	checkError(err)
+	k := int32(kTemp)
+
+	ATemp := strings.Split(strings.TrimSpace(readLine(reader)), " ")
+
+	var A []int32
+
+	for i := 0; i < int(n); i++ {
+		AItemTemp, err := strconv.ParseInt(ATemp[i], 10, 64)
+		checkError(err)
+		AItem := int32(AItemTemp)
+		A = append(A, AItem)
+	}
+
+	result := cookies(k, A)
+
+	fmt.Fprintf(writer, "%d\n", result)
+
+	writer.Flush()
+}
+
+func readLine(reader *bufio.Reader) string {
+	str, _, err := reader.ReadLine()
+	if err == io.EOF {
+		return ""
+	}
+
+	return strings.TrimRight(string(str), "\r\n")
+}
+
+func checkError(err error) {
+	if err != nil {
+		panic(err)
+	}
+}

hacker02/other.txt

@@ -0,0 +1,2 @@
+8 90
+13 47 74 12 89 74 18 38

itertools.go

@@ -0,0 +1,56 @@
+package aoc
+
+import (
+	"strconv"
+)
+
+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 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 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
+}
+
+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
+}
+
+// Pairwise iterates over a list pairing i, i+1
+func Pairwise[T any](arr []T) [][2]T {
+	var pairs [][2]T
+	for i := range arr[:len(arr)-1] {
+		pairs = append(pairs, [2]T{arr[i], arr[i+1]})
+	}
+	return pairs
+}

itertools_test.go

@@ -0,0 +1,44 @@
+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 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 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},
+		},
+	)
+}

lists.go

@@ -0,0 +1,100 @@
+package aoc
+
+import "fmt"
+
+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
+}

math.go

@@ -0,0 +1,96 @@
+package aoc
+
+import "cmp"
+
+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 Sum[T number](arr ...T) T {
+	var acc T
+	for _, a := range arr {
+		acc += a
+	}
+	return acc
+}
+func SumFunc[T any, U number](fn func(T) U, input ...T) U {
+	return Sum(SliceMap(fn, input...)...)
+}
+func SumIFunc[T any, U number](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 integer](i I) I {
+	if i < 0 {
+		return -i
+	}
+	return i
+}
+
+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
+}

math_test.go

@@ -0,0 +1,33 @@
+package aoc_test
+
+import (
+	"testing"
+
+	"github.com/matryer/is"
+	aoc "go.sour.is/advent-of-code"
+)
+
+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 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)
+}

ranger/channel.go

@@ -0,0 +1,15 @@
+package main
+
+
+func countChan(n int) <-chan int {
+	ch := make(chan int)
+
+	go func() {
+		for i := range n {
+			ch <- i
+		}
+		close(ch)
+	}()
+
+	return ch
+}

ranger/range.go

@@ -0,0 +1,84 @@
+package main
+
+// export GOEXPERIMENT=rangefunc
+import "iter"
+
+func Step(start, stop, step int) iter.Seq[int] {
+	if step < 0 {
+		return func(yield func(int) bool) {
+			for i := start; i <= start && i > stop; i += step {
+				next := yield(i)
+				if !next {
+					return
+				}
+			}
+		}
+	}
+
+	if step > 0 {
+		return func(yield func(int) bool) {
+			for i := start; i >= start && i < stop; i += step {
+				next := yield(i)
+				if !next {
+					println("stopped!")
+					return
+				}
+			}
+		}
+	}
+
+	return func(yield func(int) bool) { yield(start) }
+}
+
+func Fib() iter.Seq[uint] {
+	return func(yield func(uint) bool) {
+		previous, value := uint(1), uint(1)
+		next := yield(value)
+		for next {
+			next = yield(value)
+			value, previous = value+previous, value
+			if value < previous {
+				return
+			}
+		}
+	}
+}
+
+func Fizzbuzzed[T int | uint](from iter.Seq[T]) iter.Seq2[T, string] {
+	pull, stop := iter.Pull(from)
+	return func(yield func(T, string) bool) {
+		defer stop()
+		for {
+			var fizzbuzz string
+			p, ok := pull()
+			if !ok {
+				return
+			}
+			if p%3 == 0 {
+				fizzbuzz = "fizz"
+			}
+			if p%5 == 0 {
+				fizzbuzz += "buzz"
+			}
+			if !yield(p, fizzbuzz) {
+				return
+			}
+		}
+	}
+}
+
+// func main() {
+// 	for i, v := range Fizzbuzzed(Fib()) {
+// 		println(i, v)
+// 	}
+// }
+
+func countScan(n int) (func() bool, func() int) {
+	pos := -1
+	return func() bool {
+			pos++
+			return pos < n
+		}, func() int {
+			return pos
+		}
+}

ranger/range_test.go

@@ -0,0 +1,193 @@
+package main_test
+
+import (
+	"testing"
+
+	"github.com/matryer/is"
+)
+
+// func BenchmarkChan(b *testing.B) {
+// 	sum := 0
+
+// 	for n := range countChan(b.N) {
+// 		sum += n
+// 	}
+// 	b.StopTimer()
+// 	b.Log(sum)
+// }
+
+// func BenchmarkScan(b *testing.B) {
+// 	sum := 0
+// 	scan, value := countScan(b.N)
+// 	for scan() {
+// 		sum += value()
+// 	}
+// 	b.StopTimer()
+// 	b.Log(sum)
+// }
+
+// func BenchmarkRange(b *testing.B) {
+// 	sum := 0
+// 	for n := range countRF(b.N) {
+// 		sum += n
+// 	}
+// 	b.StopTimer()
+// 	b.Log(sum)
+// }
+
+// func TestRangeS(t *testing.T) {
+// 	for i := range Step(0, 10, 3) {
+// 		t.Log(i)
+// 	}
+
+// 	for i := range Step(10, 0, -3) {
+// 		t.Log(i)
+// 	}
+// }
+
+func TestSelect(t *testing.T) {
+	done1 := make(chan struct{})
+	done2 := make(chan struct{})
+
+	go func() {
+		close(done1)
+		close(done2)
+	}()
+
+	for i, ch := range []chan struct{}{done1, done2} {
+		<-ch
+		println("closed", i)
+	}
+}
+
+func TestGCD(t *testing.T) {
+	is := is.New(t)
+	is.Equal(gcdOfStrings("ABAB", "ABABAB"), "AB")
+	is.Equal(gcdOfStrings("ABAB", "ABABABAB"), "ABAB")
+	is.Equal(gcdOfStrings("ABC", "ABCABC"), "ABC")
+	is.Equal(gcdOfStrings("ABC", "ABCDEF"), "")
+	is.Equal(gcdOfStrings("AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA", "AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA"), "AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA")
+}
+func gcdOfStrings(str1 string, str2 string) string {
+	if len(str1) == 0 {
+		return ""
+	}
+	runes1 := []rune(str1)
+	runes2 := []rune(str2)
+
+	n := max(len(runes1), len(runes2))
+	m := min(len(runes1), len(runes2))
+
+	if len(runes2) == m {
+		runes1, runes2 = runes2, runes1
+	}
+
+	if isRepeating(runes1, runes2) {
+		return string(runes1)
+	}
+
+	for i := n; i > 0; i-- {
+		if runes1[i%len(runes1)] != runes2[i%len(runes2)] {
+			return ""
+		}
+		gcd := runes2[:i]
+		if isRepeating(gcd, runes1) && isRepeating(gcd, runes2) {
+			return string(gcd)
+		}
+	}
+
+	return ""
+}
+func isRepeating(str1, str2 []rune) bool {
+	if len(str1) > len(str2) {
+		return false
+	}
+	if len(str2)%len(str1) != 0 {
+		return false
+	}
+	for i := range str2 {
+		if str1[i%len(str1)] != str2[i] {
+			return false
+		}
+	}
+	return true
+}
+
+func canPlaceFlowers(flowerbed []int, n int) bool {
+	var c int
+
+	for i := 0; i < len(flowerbed); i++ {
+		if (i == 0 || flowerbed[i-1] == 0) &&
+			flowerbed[i] == 0 &&
+			(i == len(flowerbed)-1 || flowerbed[i+1] == 0) {
+			c++
+			flowerbed[i] = 1
+		}
+	}
+
+	return c >= n
+}
+
+func TestFlowers(t *testing.T) {
+	is := is.New(t)
+	is.Equal(canPlaceFlowers([]int{1, 0, 0, 0, 1}, 1), true)
+	is.Equal(canPlaceFlowers([]int{0, 0, 1, 0, 1}, 1), true)
+	is.Equal(canPlaceFlowers([]int{1, 0, 1, 0, 0}, 1), true)
+}
+
+func dailyTemperatures(temperatures []int) []int {
+	answers := make([]int, len(temperatures))
+	var stack  [][2]int
+	push := func(v int) {
+		if len(stack) == 0 {
+			stack = append(stack, [2]int{v, 1})
+			return
+		}
+		end := len(stack)-1
+		if v < stack[end][0]{
+			stack = append(stack, [2]int{v, 1})
+			return
+
+		}
+		if v == stack[end][0] {
+			stack[len(stack)-1][1]++
+			return
+		}
+
+		var vs = [2]int{v, 1}
+		// for ; end>0; end-- {	
+		// 	if stack[end][0]<vs[0] {
+		// 		vs[1]+=stack[end][1]
+		// 		continue
+		// 	}
+		// 	break
+		// }
+		stack = append(stack, vs)
+	}
+
+	for i := len(temperatures) - 2; i >= 0; i-- {
+		push(temperatures[i+1])
+		currentTemp := temperatures[i]
+		days := 1
+		end := len(stack)-1
+		for j := range stack {
+			nextTemp := stack[end-j]
+			if currentTemp < nextTemp[0] {
+				answers[i] = days
+				break
+			}
+			days+=nextTemp[1]
+		}
+	}
+
+	return answers
+}
+
+func TestTemps(t *testing.T) {
+	is := is.New(t)
+	is.Equal(dailyTemperatures(
+		[]int{73, 74, 75, 71, 69, 72, 76, 73}),
+		[]int{1, 1, 4, 2, 1, 1, 0, 0})
+	is.Equal(dailyTemperatures(
+		[]int{99,99,99,99,100}), []int{4,3,2,1,0})	
+}

ranger/rangefunc.go

@@ -0,0 +1,12 @@
+package main
+
+
+func countRF(n int) func(yield func(int) bool) {
+	return func(yield func(int) bool) {
+		for i := range n {
+			if !yield(i) {
+				return
+			}
+		}
+	}
+} 

runner.go

@@ -0,0 +1,94 @@
+package aoc
+
+import (
+	"bufio"
+	"flag"
+	"fmt"
+	"log"
+	"os"
+	"path/filepath"
+	"runtime"
+	"runtime/pprof"
+	"strings"
+	"time"
+)
+
+var cpuprofile = flag.String("cpuprofile", "", "write cpu profile to `file`")
+var memprofile = flag.String("memprofile", "", "write memory profile to `file`")
+
+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)
+	}
+
+	inputFilename := os.Args[1]
+	os.Args = append(os.Args[:1], os.Args[2:]...)
+
+	flag.Parse()
+	Log(cpuprofile, memprofile, *cpuprofile, *memprofile)
+	if *cpuprofile != "" {
+		Log("enabled cpu profile")
+		f, err := os.Create(*cpuprofile)
+		if err != nil {
+			log.Fatal("could not create CPU profile: ", err)
+		}
+		defer f.Close() // error handling omitted for example
+		Log("write cpu profile to", f.Name())
+		if err := pprof.StartCPUProfile(f); err != nil {
+			log.Fatal("could not start CPU profile: ", err)
+		}
+		defer pprof.StopCPUProfile()
+	}
+
+	if *memprofile != "" {
+		Log("enabled mem profile")
+		defer func() {
+			f, err := os.Create(*memprofile)
+			if err != nil {
+				log.Fatal("could not create memory profile: ", err)
+			}
+			Log("write mem profile to", f.Name())
+			defer f.Close() // error handling omitted for example
+			runtime.GC()    // get up-to-date statistics
+			if err := pprof.WriteHeapProfile(f); err != nil {
+				log.Fatal("could not write memory profile: ", err)
+			}
+		}()
+	}
+
+
+	input, err := os.Open(inputFilename)
+	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.Fprint(os.Stderr, time.Now(), ": ")
+	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 ReadStringToInts(fields []string) []int {
+	return SliceMap(Atoi, fields...)
+}

search.go

@@ -0,0 +1,324 @@
+package aoc
+
+import (
+	"math/bits"
+	"sort"
+)
+
+type priorityQueue[T any] struct {
+	elems        []*T
+	less         func(a, b *T) bool
+	maxDepth     int
+	totalEnqueue int
+	totalDequeue int
+}
+
+// PriorityQueue implements a simple slice based queue.
+// less is the function for sorting. reverse a and b to reverse the sort.
+// T is the item
+// U is a slice of T
+func PriorityQueue[T any](less func(a, b *T) bool) *priorityQueue[T] {
+	return &priorityQueue[T]{less: less}
+}
+func (pq *priorityQueue[T]) Insert(elem *T) {
+	pq.totalEnqueue++
+
+	pq.elems = append(pq.elems, elem)
+	pq.maxDepth = max(pq.maxDepth, len(pq.elems))
+}
+func (pq *priorityQueue[T]) IsEmpty() bool {
+	return len(pq.elems) == 0
+}
+func (pq *priorityQueue[T]) ExtractMin() *T {
+	pq.totalDequeue++
+
+	var elem *T
+	if pq.IsEmpty() {
+		return elem
+	}
+
+	sort.Slice(pq.elems, func(i, j int) bool { return pq.less(pq.elems[j], pq.elems[i]) })
+	pq.elems, elem = pq.elems[:len(pq.elems)-1], pq.elems[len(pq.elems)-1]
+	return elem
+}
+
+// ManhattanDistance the distance between two points measured along axes at right angles.
+func ManhattanDistance[T integer](a, b Point[T]) T {
+	return ABS(a[0]-b[0]) + ABS(a[1]-b[1])
+}
+
+type pather[C number, N comparable] interface {
+	// Neighbors returns all neighbors to node N that should be considered next.
+	Neighbors(N) []N
+
+	// Cost returns
+	Cost(a, b N) C
+
+	// Target returns true when target reached. receives node and cost.
+	Target(N, C) bool
+
+	// OPTIONAL:
+	// Add heuristic for running as A* search.
+	// Potential(N) C
+
+	// Seen modify value used by seen pruning.
+	// Seen(N) N
+
+}
+
+// FindPath uses the A* path finding algorithem.
+// g is the graph source that implements the pather interface.
+//
+//	C is an numeric type for calculating cost/potential
+//	N is the node values. is comparable for storing in visited table for pruning.
+//
+// start, end are nodes that dileniate the start and end of the search path.
+// The returned values are the calculated cost and the path taken from start to end.
+func FindPath[C integer, N comparable](g pather[C, N], start, end N) (C, []N, map[N]C) {
+	var zero C
+
+	var seenFn = func(a N) N { return a }
+	if s, ok := g.(interface{ Seen(N) N }); ok {
+		seenFn = s.Seen
+	}
+
+	var potentialFn = func(N) C { var zero C; return zero }
+	if p, ok := g.(interface{ Potential(N) C }); ok {
+		potentialFn = p.Potential
+	}
+
+	type node struct {
+		cost      C
+		potential C
+		parent    *node
+		position  N
+	}
+
+	newPath := func(n *node) []N {
+		var path []N
+		for n.parent != nil {
+			path = append(path, n.position)
+			n = n.parent
+		}
+		path = append(path, n.position)
+
+		Reverse(path)
+		return path
+	}
+
+	less := func(a, b *node) bool {
+		return a.cost+a.potential < b.cost+b.potential
+	}
+
+	closed := make(map[N]C)
+	open := FibHeap(less)
+
+	open.Insert(&node{position: start, potential: potentialFn(start)})
+	closed[start] = zero
+
+	for !open.IsEmpty() {
+		current := open.ExtractMin()
+		for _, nb := range g.Neighbors(current.position) {
+			next := &node{
+				position:  nb,
+				parent:    current,
+				cost:      g.Cost(current.position, nb) + current.cost,
+				potential: potentialFn(nb),
+			}
+
+			seen := seenFn(nb)
+			cost, ok := closed[seen]
+			if !ok || next.cost < cost {
+				open.Insert(next)
+				closed[seen] = next.cost
+			}
+
+			if next.potential == zero && g.Target(next.position, next.cost) {
+				return next.cost, newPath(next), closed
+			}
+		}
+	}
+	return zero, nil, closed
+}
+
+type fibTree[T any] struct {
+	value  *T
+	parent *fibTree[T]
+	child  []*fibTree[T]
+	mark   bool
+}
+
+func (t *fibTree[T]) Value() *T { return t.value }
+func (t *fibTree[T]) addAtEnd(n *fibTree[T]) {
+	n.parent = t
+	t.child = append(t.child, n)
+}
+
+type fibHeap[T any] struct {
+	trees []*fibTree[T]
+	least *fibTree[T]
+	count uint
+	less  func(a, b *T) bool
+}
+
+func FibHeap[T any](less func(a, b *T) bool) *fibHeap[T] {
+	return &fibHeap[T]{less: less}
+}
+
+func (h *fibHeap[T]) GetMin() *T {
+	return h.least.value
+}
+
+func (h *fibHeap[T]) IsEmpty() bool { return h.least == nil }
+
+func (h *fibHeap[T]) Insert(v *T) {
+	ntree := &fibTree[T]{value: v}
+	h.trees = append(h.trees, ntree)
+	if h.least == nil || h.less(v, h.least.value) {
+		h.least = ntree
+	}
+	h.count++
+}
+
+func (h *fibHeap[T]) ExtractMin() *T {
+	smallest := h.least
+	if smallest != nil {
+		// Remove smallest from root trees.
+		for i := range h.trees {
+			pos := h.trees[i]
+			if pos == smallest {
+				h.trees[i] = h.trees[len(h.trees)-1]
+				h.trees = h.trees[:len(h.trees)-1]
+				break
+			}
+		}
+
+		// Add children to root
+		h.trees = append(h.trees, smallest.child...)
+		smallest.child = smallest.child[:0]
+
+		h.least = nil
+		if len(h.trees) > 0 {
+			h.consolidate()
+		}
+
+		h.count--
+		return smallest.value
+	}
+	return nil
+}
+
+func (h *fibHeap[T]) consolidate() {
+	aux := make([]*fibTree[T], bits.Len(h.count)+1)
+	for _, x := range h.trees {
+		order := len(x.child)
+
+		// consolidate the larger roots under smaller roots of same order until we have at most one tree per order.
+		for aux[order] != nil {
+			y := aux[order]
+			if h.less(y.value, x.value) {
+				x, y = y, x
+			}
+			x.addAtEnd(y)
+			aux[order] = nil
+			order++
+		}
+		aux[order] = x
+	}
+
+	h.trees = h.trees[:0]
+	// move ordered trees to root and find least node.
+	for _, k := range aux {
+		if k != nil {
+			k.parent = nil
+			h.trees = append(h.trees, k)
+			if h.least == nil || h.less(k.value, h.least.value) {
+				h.least = k
+			}
+		}
+	}
+}
+
+func (h *fibHeap[T]) Merge(a *fibHeap[T]) {
+	h.trees = append(h.trees, a.trees...)
+	h.count += a.count
+	if h.least == nil || a.least != nil && h.less(a.least.value, h.least.value) {
+		h.least = a.least
+	}
+}
+
+func (h *fibHeap[T]) find(fn func(*T) bool) *fibTree[T] {
+	var st []*fibTree[T]
+	st = append(st, h.trees...)
+	var tr *fibTree[T]
+
+	for len(st) > 0 {
+		tr, st = st[0], st[1:]
+		ro := *tr.value
+		if fn(&ro) {
+			break
+		}
+		st = append(st, tr.child...)
+	}
+
+	return tr
+}
+
+func (h *fibHeap[T]) Find(fn func(*T) bool) *T {
+	if needle := h.find(fn); needle != nil {
+		return needle.value
+	}
+
+	return nil
+}
+
+func (h *fibHeap[T]) DecreaseKey(find func(*T) bool, decrease func(*T)) {
+	needle := h.find(find)
+	if needle == nil {
+		return
+	}
+	decrease(needle.value)
+
+	if h.less(needle.value, h.least.value) {
+		h.least = needle
+	}
+
+	if parent := needle.parent; parent != nil {
+		if h.less(needle.value, parent.value) {
+			h.cut(needle)
+			h.cascadingCut(parent)
+		}
+	}
+}
+
+func (h *fibHeap[T]) cut(x *fibTree[T]) {
+	parent := x.parent
+	for i := range parent.child {
+		pos := parent.child[i]
+		if pos == x {
+			parent.child[i] = parent.child[len(parent.child)-1]
+			parent.child = parent.child[:len(parent.child)-1]
+			break
+		}
+	}
+
+	x.parent = nil
+	x.mark = false
+	h.trees = append(h.trees, x)
+
+	if h.less(x.value, h.least.value) {
+		h.least = x
+	}
+}
+
+func (h *fibHeap[T]) cascadingCut(y *fibTree[T]) {
+	if y.parent != nil {
+		if !y.mark {
+			y.mark = true
+			return
+		}
+
+		h.cut(y)
+		h.cascadingCut(y.parent)
+	}
+}

set.go

@@ -0,0 +1,68 @@
+package aoc
+
+import "golang.org/x/exp/maps"
+
+type set[T comparable] map[T]struct{}
+
+func Set[T comparable](arr ...T) set[T] {
+	m := make(set[T], len(arr))
+	for _, a := range arr {
+		m[a] = struct{}{}
+	}
+	return m
+}
+func (m *set[T]) Add(a T) {
+	(*m)[a] = struct{}{}
+}
+func (m *set[T]) Items() []T {
+	return maps.Keys(*m)
+}
+func (m *set[T]) Has(a T) bool {
+	var ok bool
+	_, ok = (*m)[a]
+	return ok
+}
+
+type defaultMap[K comparable, V any] struct {
+	m map[K]V
+	d V
+}
+
+func DefaultMap[K comparable, V any](d V) *defaultMap[K, V] {
+	return &defaultMap[K, V]{
+		make(map[K]V),
+		d,
+	}
+}
+
+func (m *defaultMap[K, V]) Set(k K, v V) {
+	m.m[k] = v
+}
+func (m *defaultMap[K, V]) Get(k K) (V, bool) {
+	if v, ok := m.m[k]; ok {
+		return v, true
+	}
+	return m.d, false
+}
+
+type pair[K, V any] struct {
+	K K
+	V V
+}
+
+func (m *defaultMap[K, V]) Items() []pair[K, V] {
+	var items = make([]pair[K, V], 0, len(m.m))
+	for k, v := range m.m {
+		items = append(items, pair[K, V]{k, v})
+	}
+	return items
+}
+
+func In[C comparable](n C, haystack ...C) bool {
+	for _, h := range haystack {
+		if n == h {
+			return true
+		}
+	}
+	return false
+}

set_test.go

@@ -0,0 +1,27 @@
+package aoc_test
+
+import (
+	"sort"
+	"testing"
+
+	"github.com/matryer/is"
+	aoc "go.sour.is/advent-of-code"
+)
+
+func TestSet(t *testing.T) {
+	is := is.New(t)
+
+	s := aoc.Set(1, 2, 3)
+	is.True(!s.Has(0))
+	is.True(s.Has(1))
+	is.True(s.Has(2))
+	is.True(s.Has(3))
+	is.True(!s.Has(4))
+
+	s.Add(4)
+	is.True(s.Has(4))
+
+	items := s.Items()
+	sort.Ints(items)
+	is.Equal(items, []int{1, 2, 3, 4})
+}

tools.go

@@ -1,395 +0,0 @@
-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
-}

tools_test.go

@@ -1,93 +0,0 @@
-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)
-}