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+#.....#.#.....#.#.#.#####.#.#...#.......#.#.#...#...#.........###...#.#...>.>.#.#...#.#.#...#.#.#...>.>.#.#.#.#.........#...#.#...#.###...### +#####.#.#.#####.#.#.#####.#.#####.#######.#.###.#.###########v###.###.#.#######.#.###.#.#####.#.#########.#.#.#########.###.#.#.###.#####.### +#####...#.....#.#...#.....#.....#.......#.#...#.#...#...#...>.>.#.###.#.....###.#.###.#.###...#.......#...#.#.#.......#.#...#.#.....#...#...# +#############.#.#####.#########.#######.#.###.#.###.#.#.#.#####.#.###.#####.###.#.###.#.###.#########.#.###.#.#.#####.#.#.###.#######.#.###.# +#.............#...#...#...#.....#.......#.#...#...#.#.#.#.....#.#.#...#.....#...#...#.#...#.....#.....#...#.#.#.....#.#.#...#.#.......#.....# +#.###############.#.###.#.#.#####.#######.#.#####.#.#.#.#####.#.#.#.###.#####.#####.#.###.#####.#.#######.#.#.#####.#.#.###.#.#.############# +#.................#.....#...#####.........#.......#...#.......#...#.....#####.......#.....#####...#######...#.......#...###...#.............# +###########################################################################################################################################.# diff --git a/day23/main.go b/day23/main.go new file mode 100644 index 0000000..a5ca834 --- /dev/null +++ b/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 +} \ No newline at end of file diff --git a/day23/main_test.go b/day23/main_test.go new file mode 100644 index 0000000..8a501e3 --- /dev/null +++ b/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) +// } diff --git a/grids.go b/grids.go index 17fdb58..ec504be 100644 --- a/grids.go +++ b/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) } } @@ -130,18 +132,19 @@ 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 - } else if to, ok := visited[b]; ok { + continue + } else if to, ok := visited[b]; ok { to[a] = to[n] + p.Cost(n, a) delete(to, n) visited[b] = to + continue } - continue } visited[n] = make(map[N]C) diff --git a/itertools_test.go b/itertools_test.go index db9ea78..63d1b45 100644 --- a/itertools_test.go +++ b/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) @@ -44,4 +41,4 @@ func TestTranspose(t *testing.T) { {1, 0, 1}, }, ) -} \ No newline at end of file +} diff --git a/math_test.go b/math_test.go index 14b2fd3..eeb8f2f 100644 --- a/math_test.go +++ b/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) @@ -24,4 +30,4 @@ func TestABS(t *testing.T) { is.Equal(aoc.ABS(1), 1) is.Equal(aoc.ABS(0), 0) is.Equal(aoc.ABS(-1), 1) -} \ No newline at end of file +} diff --git a/search.go b/search.go index 1895af4..a15639b 100644 --- a/search.go +++ b/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 +} diff --git a/set_test.go b/set_test.go index 16b12c9..c4a5d3d 100644 --- a/set_test.go +++ b/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) @@ -17,4 +24,4 @@ func TestSet(t *testing.T) { items := s.Items() sort.Ints(items) is.Equal(items, []int{1, 2, 3, 4}) -} \ No newline at end of file +}