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+###########################################################################################################################################.# diff --git a/day23/main.go b/day23/main.go new file mode 100644 index 0000000..38871bf --- /dev/null +++ b/day23/main.go @@ -0,0 +1,237 @@ +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 +} + +// Potential calculates distance to target +func (g *graph) Potential(a, b position) int16 { + return aoc.ManhattanDistance(a.loc, b.loc) +} + +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) +// }