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+#.....#.#.....#.#.#.#####.#.#...#.......#.#.#...#...#.........###...#.#...>.>.#.#...#.#.#...#.#.#...>.>.#.#.#.#.........#...#.#...#.###...###
+#####.#.#.#####.#.#.#####.#.#####.#######.#.###.#.###########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 +2,9 @@ package aoc
 
 import (
 	"cmp"
+	"fmt"
 	"sort"
+	"strings"
 
 	"golang.org/x/exp/maps"
 )
@@ -110,7 +112,7 @@ func (m *cmap[C, N]) String() string {
 	for k, nbs := range m.neighbors {
 		fmt.Fprintln(b, k)
 		for to, v := range nbs {
-			fmt.Fprintln(b, "  ", to, k)
+			fmt.Fprintln(b, "  ", to, v)
 		}
 	}
 
@@ -130,19 +132,20 @@ func CompressMap[C number, N comparable](p pather[C, N], start N) pather[C, N] {
 		}
 
 		nbs := p.Neighbors(n)
-		if len(nbs) == 2 {
+		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...)

itertools_test.go

@@ -1,8 +1,6 @@
 package aoc_test
 
 import (
-	"fmt"
-	"sort"
 	"testing"
 
 	"github.com/matryer/is"
@@ -27,7 +25,6 @@ func TestRepeat(t *testing.T) {
 	is.Equal(aoc.Repeat(5, 3), []int{5, 5, 5})
 }
 
-
 func TestTranspose(t *testing.T) {
 	is := is.New(t)
 

math_test.go

@@ -1,5 +1,11 @@
 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)

search.go

@@ -1,6 +1,7 @@
 package aoc
 
 import (
+	"maps"
 	"math/bits"
 	"sort"
 )
@@ -322,3 +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

@@ -1,5 +1,12 @@
 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)