chore(day23): solution for day23 pt1/pt2

aoc_test.go

@@ -9,66 +9,6 @@ import (
 	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)
@@ -116,23 +56,6 @@ func TestPriorityQueue(t *testing.T) {
 	is.True(v == nil)
 }
 
-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})
-}
 
 func ExamplePriorityQueue() {
 	type memo struct {
@@ -194,26 +117,6 @@ func ExamplePriorityQueue() {
 	// point 5 is 22 steps away.
 	// point 6 is 19 steps away.
 }
-
-func TestStack(t *testing.T) {
-	is := is.New(t)
-
-	s := aoc.Stack(1, 2, 3, 4)
-	is.True(!s.IsEmpty())
-	is.Equal(s.Pop(), 4)
-	is.Equal(s.Pop(), 3)
-	is.Equal(s.Pop(), 2)
-	is.Equal(s.Pop(), 1)
-	is.True(s.IsEmpty())
-	s.Push(4, 3, 2, 1)
-	is.True(!s.IsEmpty())
-	is.Equal(s.Pop(), 1)
-	is.Equal(s.Pop(), 2)
-	is.Equal(s.Pop(), 3)
-	is.Equal(s.Pop(), 4)
-	is.True(s.IsEmpty())
-}
-
 func TestGraph(t *testing.T) {
 	is := is.New(t)
 

day23/example.txt

@@ -0,0 +1,23 @@
+#.#####################
+#.......#########...###
+#######.#########.#.###
+###.....#.>.>.###.#.###
+###v#####.#v#.###.#.###
+###.>...#.#.#.....#...#
+###v###.#.#.#########.#
+###...#.#.#.......#...#
+#####.#.#.#######.#.###
+#.....#.#.#.......#...#
+#.#####.#.#.#########v#
+#.#...#...#...###...>.#
+#.#.#v#######v###.###v#
+#...#.>.#...>.>.#.###.#
+#####v#.#.###v#.#.###.#
+#.....#...#...#.#.#...#
+#.#########.###.#.#.###
+#...###...#...#...#.###
+###.###.#.###v#####v###
+#...#...#.#.>.>.#.>.###
+#.###.###.#.###.#.#v###
+#.....###...###...#...#
+#####################.#

day23/input.txt

@@ -0,0 +1,141 @@
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+#.......#.#...#...#...#...#...#.#.#...#.#.#.#.#...#...#.#.#.#.#.#.#...#.#.#.#.>.>.###...#.....#.#.###.......#.#.......#.#.#.#...#.......#...#
+#.#######.###.#.#####.#.#####.#.#v#.#.#.#.#.#.###.#.###.#.#v#.#.#.###.#.#.#.###v#####.#######.#.#.###.#######.#.#######.#.#.#.###########.###
+#...#...#...#.#.#.....#.#...#.#.>.>.#.#.#...#.#...#...#.#.>.>.#.#.#...#.#...###.....#...#...#.#.#.#...#.....#.#.....###...#.#...#.........###
+###.#.#.###.#.#.#.#####.#.#.#.###v###.#.#####.#.#####.#.###v###.#.#.###.###########.###.#.#.#.#.#.#.###.###.#.#####.#######.###.#.###########
+###.#.#.#...#...#.....#...#...###.#...#.....#...#.....#.###...#...#.....#...#...#...#...#.#.#.#.#.#...#.#...#...#...#...###.....#...........#
+###.#.#.#.###########.###########.#.#######.#####.#####.#####.###########.#.#.#.#.###.###.#.#.#.#.###.#.#.#####.#.###.#.###################.#
+#...#.#.#.#...........###...#.....#...#...#.....#.#.....#####.......#.....#...#.#...#.#...#...#...###...#.....#.#.###.#.#...#...#...........#
+#.###.#.#.#.#############.#.#.#######.#.#.#####.#.#.###############.#.#########.###.#.#.#####################.#.#.###.#.#.#.#.#.#.###########
+#...#.#.#.#.#...........#.#.#.#.....#.#.#.#.....#...#...............#...#...###.....#.#...#.................#.#.#.#...#...#.#.#.#.........###
+###.#.#.#.#.#.#########.#.#.#.#.###.#.#.#.#.#########.#################.#.#.#########.###.#.###############.#.#.#.#.#######.#.#.#########.###
+###.#.#.#.#.#.#.......#...#.#...#...#.#.#.#...#...#...#...#.......#...#...#.........#.....#...............#...#...#...#.....#.#.#...#...#...#
+###.#.#.#.#.#.#.#####.#####.#####.###.#.#.###.#.#.#.###.#.#.#####.#.#.#############.#####################.###########.#.#####.#.#.#.#v#.###.#
+###.#.#.#.#...#.....#.#...#.#...#.###...#.....#.#.#...#.#...#.....#.#.#.............###...#...#.....#...#.#.......#...#...#...#.#.#.>.#.....#
+###.#.#.#.#########.#.#.#.#.#.#.#.#############.#.###.#.#####.#####.#.#.###############.#.#.#.#.###.#.#.#.#.#####.#.#####.#.###.#.###v#######
+###...#...#.....#...#...#...#.#.#...........###.#.###...#.....###...#.#.......#.......#.#.#.#.#...#...#.#.#.....#...###...#...#...#...#...###
+###########.###.#.###########.#.###########.###.#.#######.#######.###.#######.#.#####.#.#.#.#.###.#####.#.#####.#######.#####.#####.###.#.###
+#.......###...#...#...###.....#.............#...#.......#.......#.#...#...#...#.#.....#.#.#.#.###.....#...#...#.......#.......#...#.....#...#
+#.#####.#####.#####.#.###.###################.#########.#######.#.#.###.#.#.###.#.#####.#.#.#.#######.#####.#.#######.#########.#.#########.#
+#.....#.......#...#.#...#.........#...###...#...#.......#...#...#.#...#.#...#...#.#...#.#.#.#.#...#...#...#.#.###...#...###.....#...........#
+#####.#########.#.#.###.#########v#.#.###.#.###.#.#######.#.#.###.###.#.#####.###.#.#.#.#.#.#.#.#.#.###.#.#.#.###.#.###.###.#################
+#.....#.......#.#.#.###...#...#.>.>.#...#.#.#...#...#.....#...###...#.#.....#.#...#.#.#.#.#.#.#.#.#...#.#.#.#.#...#.....#...#.....#.....#####
+#.#####.#####.#.#.#.#####.#.#.#.#######.#.#.#.#####.#.#############.#.#####v#.#.###.#.#.#.#.#.#.#.###v#.#.#.#.#.#########.###.###.#.###.#####
+#.....#.#.....#.#.#.#####.#.#...#.......#.#.#...#...#.........###...#.#...>.>.#.#...#.#.#...#.#.#...>.>.#.#.#.#.........#...#.#...#.###...###
+#####.#.#.#####.#.#.#####.#.#####.#######.#.###.#.###########v###.###.#.#######.#.###.#.#####.#.#########.#.#.#########.###.#.#.###.#####.###
+#####...#.....#.#...#.....#.....#.......#.#...#.#...#...#...>.>.#.###.#.....###.#.###.#.###...#.......#...#.#.#.......#.#...#.#.....#...#...#
+#############.#.#####.#########.#######.#.###.#.###.#.#.#.#####.#.###.#####.###.#.###.#.###.#########.#.###.#.#.#####.#.#.###.#######.#.###.#
+#.............#...#...#...#.....#.......#.#...#...#.#.#.#.....#.#.#...#.....#...#...#.#...#.....#.....#...#.#.#.....#.#.#...#.#.......#.....#
+#.###############.#.###.#.#.#####.#######.#.#####.#.#.#.#####.#.#.#.###.#####.#####.#.###.#####.#.#######.#.#.#####.#.#.###.#.#.#############
+#.................#.....#...#####.........#.......#...#.......#...#.....#####.......#.....#####...#######...#.......#...###...#.............#
+###########################################################################################################################################.#

day23/main.go

@@ -0,0 +1,236 @@
+package main
+
+import (
+	"bufio"
+	_ "embed"
+	"fmt"
+	"strings"
+
+	aoc "go.sour.is/advent-of-code"
+)
+
+var log = aoc.Log
+
+func main() { aoc.MustResult(aoc.Runner(run)) }
+
+type result struct {
+	valuePT1 int
+	valuePT2 int
+}
+
+func (r result) String() string { return fmt.Sprintf("%#v", r) }
+
+func run(scan *bufio.Scanner) (*result, error) {
+	var m aoc.Map[int16, rune]
+
+	start := Point{0, 0}
+	target := Point{0, 0}
+	var text string
+	for scan.Scan() {
+		text = scan.Text()
+		if start == target {
+			start[1] = int16(strings.IndexRune(text, '.'))
+		}
+		m = append(m, []rune(text))
+	}
+	target[0] = int16(len(m) - 1)
+	target[1] = int16(strings.IndexRune(text, '.'))
+
+	result := &result{}
+
+	result.valuePT1 = search(&graph{m: m, start: start, target: target, neighbors: part1nbs})
+	result.valuePT2 = search(&graph{m: m, start: start, target: target, neighbors: part2nbs})
+
+	return result, nil
+}
+
+type Point = aoc.Point[int16]
+type Map = aoc.Map[int16, rune]
+
+// 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 dirIDX = func() map[Point]direction {
+	m := make(map[Point]direction, len(directions))
+	for k, v := range directions {
+		m[v] = direction(k)
+	}
+	return m
+}()
+
+var arrows = []rune{'^', '>', 'v', '<'}
+
+var arrowIDX = func() map[rune]Point {
+	m := make(map[rune]Point, len(arrows))
+	for k, v := range arrows {
+		m[v] = directions[k]
+	}
+	return m
+}()
+
+// position on the map
+type position struct {
+	loc       Point
+	direction Point
+}
+
+func (p position) step(to Point) position {
+	return position{p.loc.Add(to), to}
+}
+
+// implements FindPath graph interface
+type graph struct {
+	m      Map
+	start  Point
+	target Point
+
+	neighbors func(g *graph, current position) []position
+}
+
+// Neighbors returns valid steps from given position. if at target returns none.
+func (g *graph) Neighbors(current position) []position {
+	return g.neighbors(g, current)
+}
+
+// Cost calculates heat cost to neighbor from map
+func (g *graph) Cost(a, b position) int16 {
+	return 1
+}
+
+func (g *graph) Target(a position, c int16) bool {
+	return a.loc == g.target
+}
+
+func (g *graph) Seen(a position) position {
+	a.direction = Point{}
+	return a
+}
+
+func match[T comparable](match T, lis ...T) bool {
+	for _, b := range lis {
+		if b == match {
+			return true
+		}
+	}
+
+	return false
+}
+
+func search(g *graph) int {
+	costs, paths := aoc.FindPaths[int16, position](g, position{loc: g.start}, position{loc: g.target})
+
+	for i, path := range paths {
+		log("path length = ", costs[i])
+		printGraph(g.m, path)
+	}
+
+	return int(aoc.Max(0, costs...))
+}
+
+// printGraph with the path overlay
+func printGraph(m Map, path []position) {
+	pts := make(map[Point]position, len(path))
+	for _, pt := range path {
+		pts[pt.loc] = pt
+	}
+
+	for r, row := range m {
+		for c, x := range row {
+			if _, ok := pts[Point{int16(r), int16(c)}]; ok {
+				if x == '.' {
+					fmt.Print("*")
+				} else {
+					fmt.Print(string(x))
+				}
+				continue
+			}
+			fmt.Print(".")
+			_ = x
+			// fmt.Print(string(x))
+		}
+		fmt.Println("")
+	}
+	fmt.Println("")
+}
+
+func opposite(d Point) Point {
+	return directions[(dirIDX[d]+2)%4]
+}
+
+
+func part1nbs(g *graph, current position) []position {
+	var nbs []position
+
+	if current.loc == g.start {
+		return []position{
+			{current.loc.Add(D), D},
+		}
+	}
+
+	if current.loc == g.target {
+		return nil
+	}
+
+	// only one direction on arrow.
+	_, r, _ := g.m.Get(current.loc)
+	if match(r, arrows...) {
+		to := arrowIDX[r]
+		if next := current.step(to); g.m.Valid(next.loc) {
+			_, r, _ := g.m.Get(next.loc)
+			d := arrows[(dirIDX[to]+2)%4] // flow from opposite direction
+			if !match(r, rune(d), '#') {
+				nbs = append(nbs, next)
+			}
+		}
+		return nbs
+	}
+
+	for _, to := range directions {
+		if next := current.step(to); g.m.Valid(next.loc) {
+			_, r, _ := g.m.Get(next.loc)
+			d := arrows[(dirIDX[to]+2)%4] // flow from opposite direction
+			if !match(r, rune(d), '#') {
+				nbs = append(nbs, next)
+			}
+		}
+	}
+	return nbs
+}
+
+func part2nbs(g *graph, current position) []position {
+	var nbs []position
+
+	if current.loc == g.start {
+		return []position{
+			{current.loc.Add(D), D},
+		}
+	}
+
+	if current.loc == g.target {
+		return nil
+	}
+
+	for _, to := range directions {
+		if next := current.step(to); g.m.Valid(next.loc) {
+			if next.direction == opposite(current.direction) {
+				continue
+			}
+			_, r, _ := g.m.Get(next.loc)
+			if r == '#' {
+				continue
+			}
+
+			nbs = append(nbs, next)
+		}
+	}
+	return nbs
+}

day23/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, 94)
+	is.Equal(result.valuePT2, 154)
+}
+
+// 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 > 1918)
+// 	is.Equal(result.valuePT1, 2074)
+// 	is.Equal(result.valuePT2, 0)
+// }

grids.go

@@ -2,7 +2,11 @@ package aoc
 
 import (
 	"cmp"
+	"fmt"
 	"sort"
+	"strings"
+
+	"golang.org/x/exp/maps"
 )
 
 type Vector struct {
@@ -82,6 +86,77 @@ func (m *Map[I, T]) Valid(p Point[I]) bool {
 	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, v := range nbs {
+			fmt.Fprintln(b, "  ", to, v)
+		}
+	}
+
+	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
+				continue
+			} 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])
@@ -117,7 +192,7 @@ func Graph[V any, W cmp.Ordered, C comparable](opts ...graphOption[V, W, C]) *gr
 	return &g
 }
 func (g *graph[V, W, C]) AddVertex(id C, value V) {
-	(*g)[id] = &vertex[V,W]{Value: value}
+	(*g)[id] = &vertex[V, W]{Value: value}
 }
 func (g *graph[V, W, C]) AddEdge(from, to C, w W) {
 	if g == nil {
@@ -130,7 +205,7 @@ func (g *graph[V, W, C]) AddEdge(from, to C, w W) {
 		return
 	}
 
-	(*g)[from].Edges = append((*g)[from].Edges, edge[V,W]{(*g)[to], w})
+	(*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 {
@@ -170,5 +245,3 @@ func WithAdjacencyList[W cmp.Ordered, C comparable](list adjacencyList[C, C]) gr
 		}
 	}
 }
-
-// func GraphFromMap()

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},
+		},
+	)
+}

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)
+}

search.go

@@ -1,6 +1,7 @@
 package aoc
 
 import (
+	"maps"
 	"math/bits"
 	"sort"
 )
@@ -42,30 +43,6 @@ func (pq *priorityQueue[T]) ExtractMin() *T {
 	return elem
 }
 
-type stack[T any] []T
-
-func Stack[T any](a ...T) *stack[T] {
-	var s stack[T] = a
-	return &s
-}
-func (s *stack[T]) Push(a ...T) {
-	if s == nil {
-		return
-	}
-	*s = append(*s, a...)
-}
-func (s *stack[T]) IsEmpty() bool {
-	return s == nil || len(*s) == 0
-}
-func (s *stack[T]) Pop() T {
-	var a T
-	if s.IsEmpty() {
-		return a
-	}
-	a, *s = (*s)[len(*s)-1], (*s)[:len(*s)-1]
-	return a
-}
-
 // 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])
@@ -346,3 +323,105 @@ func (h *fibHeap[T]) cascadingCut(y *fibTree[T]) {
 		h.cascadingCut(y.parent)
 	}
 }
+
+// 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 FindPaths[C integer, N comparable](g pather[C, N], start, end N) ([]C, [][]N) {
+	var zero C
+	// closed := make(map[N]bool)
+
+	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
+		closed    map[N]bool
+	}
+
+	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(b, a *node) bool {
+		return b.cost+b.potential < a.cost+a.potential
+	}
+
+	pq := PriorityQueue(less)
+	pq.Insert(&node{position: start, closed: make(map[N]bool)})
+
+	defer func() {
+		Log("queue max depth = ", pq.maxDepth, "total enqueue = ", pq.totalEnqueue, "total dequeue = ", pq.totalDequeue)
+	}()
+
+	var seenFn = func(a N) N { return a }
+	if s, ok := g.(interface{ Seen(N) N }); ok {
+		seenFn = s.Seen
+	}
+
+	var targetFn = func(n N, c C) bool { return true }
+	if s, ok := g.(interface{ Target(N, C) bool }); ok {
+		targetFn = s.Target
+	}
+
+	var paths [][]N
+	var costs []C
+
+	for !pq.IsEmpty() {
+		current := pq.ExtractMin()
+		cost, potential, n := current.cost, current.potential, current.position
+
+		seen := seenFn(n)
+		if current.closed[seen] {
+			continue
+		}
+		current.closed[seen] = true
+
+		if cost > 0 && potential == zero && cost > Max(0, costs...) && targetFn(current.position, cost) {
+			paths = append([][]N(nil), NewPath(current))
+			costs = append([]C(nil), cost)
+			Log("new record = ", cost)
+			continue
+		}
+
+		for _, nb := range g.Neighbors(n) {
+			seen := seenFn(nb)
+			if current.closed[seen] {
+				continue
+			}
+
+			cost := g.Cost(n, nb) + current.cost
+			next := &node{
+				position:  nb,
+				parent:    current,
+				cost:      cost,
+				potential: potentialFn(nb),
+				closed:    maps.Clone(current.closed),
+			}
+			// check if path is in open list
+			if _, open := current.closed[seen]; !open {
+				next.closed[seen] = false // add to open list
+				pq.Insert(next)
+			}
+		}
+	}
+	return costs, paths
+}

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})
+}