2023 Working on day 23

2023/day23/input

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+#...#.#...#...#.#.#.#.#...#...#.....#.....#...#.....#.#.#.#...#...#.....#.#.#...###...#.#.#.#...#...#.#.#...#.#...#.#.....#.....#...#.#...#.#
+#####.#.#.#.###.#.#.#.#####.###.#########.#.#.#.#####.#.#.###.###.#####.#.#.#######.###.#.#.#.###.#.#.#.###.#.###.#.#####.#.#########.#####.#
+#.....#.#.#.###.#.#.#.....#...#...#.......#.#.#.....#.#.#.#...#...#...#.#.#.......#...#.#.#.#...#.#.#.#.#...#.#...#.#.....#...#.....#.#.....#
+#.#####.#.#.###.#.#.#####.###.###.#.#######.#.#####.#.#.#.#.###.###.#.#.#.#######.###.#.#.#.###.#.#.#.#.#.###.#.###.#.#######.#.###.#.#.#####
+#.......#...###...#.......###.....#.........#.......#...#...###.....#...#.........###...#...###...#...#...###...###...#######...###...#.....#
+###########################################################################################################################################.#

2023/day23/main.go

@@ -0,0 +1,139 @@
+package main
+
+import (
+	"fmt"
+	"os"
+
+	h "git.bullercodeworks.com/brian/adventofcode/helpers"
+)
+
+func main() {
+	inp := h.StdinToStringSlice()
+	if len(os.Args) == 1 || os.Args[1] != "-p2" {
+		part1(inp)
+	}
+	if len(os.Args) == 1 {
+		fmt.Println()
+	}
+	if len(os.Args) == 1 || os.Args[1] != "-p1" {
+		part2(inp)
+	}
+}
+
+var history map[string]int
+
+func part1(input []string) {
+	history = make(map[string]int)
+	m := h.StringSliceToCoordByteMap(input)
+	start, _ := m.FindFirst('.')
+	start.Y++
+	end, _ := m.FindLast('.')
+	fmt.Println("# Part 1")
+	fmt.Println(len(findPath(&m, start, end, []h.Coordinate{})))
+}
+
+func part2(input []string) {
+	history = make(map[string]int)
+	m := h.StringSliceToCoordByteMap(input)
+	start, _ := m.FindFirst('.')
+	start.Y++
+	end, _ := m.FindLast('.')
+	m.ReplaceAll('^', '.')
+	m.ReplaceAll('>', '.')
+	m.ReplaceAll('v', '.')
+	m.ReplaceAll('<', '.')
+	fmt.Println("# Part 2")
+	fmt.Println(len(findPath(&m, start, end, []h.Coordinate{})))
+}
+
+func findPath(m *h.CoordByteMap, pos h.Coordinate, end h.Coordinate, path []h.Coordinate) []h.Coordinate {
+	ret := []h.Coordinate{pos}
+	if pos.Equals(end) {
+		//printPath(m, pos, path)
+		//time.Sleep(time.Second / 20)
+		return ret
+	}
+
+	path = append(path, pos)
+	switch m.Get(pos) {
+	case '^':
+		if inPath(pos.North(), path) {
+			return ret
+		} else {
+			return append(ret, findPath(m, pos.North(), end, path)...)
+		}
+	case '>':
+		if inPath(pos.East(), path) {
+			return ret
+		} else {
+			return append(ret, findPath(m, pos.East(), end, path)...)
+		}
+	case 'v':
+		if inPath(pos.South(), path) {
+			return ret
+		} else {
+			return append(ret, findPath(m, pos.South(), end, path)...)
+		}
+	case '<':
+		if inPath(pos.West(), path) {
+			return ret
+		} else {
+			return append(ret, findPath(m, pos.West(), end, path)...)
+		}
+	}
+
+	var longestPath []h.Coordinate
+	longest := h.MIN_INT
+	for _, chk := range []h.Coordinate{pos.North(), pos.East(), pos.South(), pos.West()} {
+		if m.Get(chk) == '#' || inPath(chk, path) || !m.ContainsCoord(chk) {
+			continue
+		}
+
+		var run bool
+		var v int
+		if v, run = history[chk.String()]; run {
+			run = v < len(path)+1
+		}
+		if run {
+			history[chk.String()] = len(path) + 1
+			chkPath := append(ret, findPath(m, chk, end, path)...)
+			if inPath(end, chkPath) && len(chkPath) > longest {
+				longest = len(chkPath)
+				longestPath = chkPath
+			}
+		}
+	}
+	return longestPath
+}
+
+func inPath(pos h.Coordinate, path []h.Coordinate) bool {
+	for _, chk := range path {
+		if chk.Equals(pos) {
+			return true
+		}
+	}
+	return false
+}
+
+func printPath(m *h.CoordByteMap, pos h.Coordinate, path []h.Coordinate) {
+	limit := (m.BRY - m.TLY) > 30
+	fmt.Print(h.CLEAR_SCREEN)
+	for y := m.TLY; y <= m.BRY; y++ {
+		if limit && h.Abs(pos.Y-y) > 15 {
+			continue
+		}
+		for x := m.TLX; x <= m.BRX; x++ {
+			chk := h.Coordinate{X: x, Y: y}
+			if chk.Equals(pos) {
+				fmt.Print("@")
+			} else {
+				if inPath(chk, path) {
+					fmt.Print("O")
+				} else {
+					fmt.Print(string(m.Get(chk)))
+				}
+			}
+		}
+		fmt.Println()
+	}
+}

2023/day23/testinput

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

helpers/coordinateByteMap.go

@@ -86,6 +86,16 @@ func (m *CoordByteMap) Height() int {
 func (m *CoordByteMap) Width() int {
 	return m.BRX - m.TLX
 }
+func (m *CoordByteMap) ReplaceAll(o, n byte) {
+	for y := m.TLY; y <= m.BRY; y++ {
+		for x := m.TLX; x <= m.BRX; x++ {
+			c := Coordinate{X: x, Y: y}
+			if m.Get(c) == o {
+				m.Put(c, n)
+			}
+		}
+	}
+}
 
 func (m *CoordByteMap) ToByteSlices() [][]byte {
 	var ret [][]byte
@@ -167,6 +177,20 @@ func (m *CoordByteMap) FindFirst(b byte) (Coordinate, error) {
 	return Coordinate{}, errors.New("Not Found")
 }
 
+// FindLast searches right to left, bottom to top for the last
+// instance of b
+func (m *CoordByteMap) FindLast(b byte) (Coordinate, error) {
+	for y := m.BRY; y >= m.TLY; y-- {
+		for x := m.BRX; x >= m.TLX; x-- {
+			c := Coordinate{X: x, Y: y}
+			if m.Get(c) == b {
+				return c, nil
+			}
+		}
+	}
+	return Coordinate{}, errors.New("Not Found")
+}
+
 func (m *CoordByteMap) FindAll(b ...byte) []Coordinate {
 	var ret []Coordinate
 	for y := m.TLY; y <= m.BRY; y++ {