2023 Day 22 Complete
Day 21, part 1 complete
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2023/day21/input
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2023/day21/input
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194
2023/day21/main.go
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194
2023/day21/main.go
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package main
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import (
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"fmt"
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h "git.bullercodeworks.com/brian/adventofcode/helpers"
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)
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func main() {
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inp := h.StdinToStringSlice()
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part1(inp)
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fmt.Println()
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part2(inp)
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}
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func part1(input []string) {
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m := h.StringSliceToCoordByteMap(input)
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start, _ := m.FindFirst('S')
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m.Put(start, '.')
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result := []h.Coordinate{start}
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for i := 0; i < 64; i++ {
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result = findNext(&m, result)
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}
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fmt.Println("# Part 1")
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fmt.Println(len(result))
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}
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// 253370351984188 is too low
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func part2(input []string) {
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m := h.StringSliceToCoordByteMap(input)
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start, _ := m.FindFirst('S')
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m.Put(start, '.')
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steps := 26501365
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p := make([]int, 3)
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size := len(input)
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half := size / 2
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fmt.Println("Getting Plots: p[0]")
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p[0], _ = getPlots(&m, half, 5)
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fmt.Println("Getting Plots: p[1]")
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m = h.StringSliceToCoordByteMap(input)
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p[1], _ = getPlots(&m, half+size, 5)
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fmt.Println("Getting Plots: p[2]")
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m = h.StringSliceToCoordByteMap(input)
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p[2], _ = getPlots(&m, half+2*size, 5)
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a := (p[2] + p[0] - 2*p[1]) / 2
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b := p[1] - p[0] - a
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c := p[0]
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n := steps / size
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result := a*n*n + b*n + c
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fmt.Println("# Part 2")
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fmt.Println(result)
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}
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var visited map[string]bool
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func getPlots(m *h.CoordByteMap, steps int, factor int) (int, error) {
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sx, sy := m.ColCount(), m.RowCount()
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l := sy
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expandMap(m, factor)
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sx = l * (factor / 2)
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sy = l * (factor / 2)
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visited = make(map[string]bool)
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return len(nextStep(sx, sy, 0, steps, m)), nil
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}
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func isPlot(m *h.CoordByteMap, x, y int) bool {
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return m.Get(h.Coordinate{X: x, Y: y}) == '.'
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}
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func nextStep(x, y, step, max int, m *h.CoordByteMap) []h.Coordinate {
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var acc []h.Coordinate
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var key = fmt.Sprintf("%d;%d;%d", x, y, step)
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if _, ok := visited[key]; ok {
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return []h.Coordinate{}
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} else {
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visited[key] = true
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}
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if step == max {
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return []h.Coordinate{{X: x, Y: y}}
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}
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if x > 0 && isPlot(m, x-1, y) {
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acc = append(acc, nextStep(x-1, y, step+1, max, m)...)
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}
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if x < m.ColCount() && isPlot(m, x+1, y) {
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acc = append(acc, nextStep(x, y-1, step+1, max, m)...)
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}
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if y > 0 && isPlot(m, x, y-1) {
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acc = append(acc, nextStep(x, y-1, step+1, max, m)...)
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}
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if y < m.RowCount() && isPlot(m, x, y+1) {
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acc = append(acc, nextStep(x, y+1, step+1, max, m)...)
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}
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return acc
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}
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func expandMap(m *h.CoordByteMap, factor int) {
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stx, edx := m.TLX, m.BRX
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for f := 1; f < factor; f++ {
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for x := stx; x <= edx; x++ {
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col := m.GetCol(x)
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m.AddCol(col)
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}
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sty, edy := m.TLY, m.BRY
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for y := sty; y <= edy; y++ {
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row := m.GetRow(y)
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m.AddRow(row)
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}
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}
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}
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func part2BruteForce(input []string) {
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// Brute force just isn't going to cut it...
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m := h.StringSliceToCoordByteMap(input)
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m.StringEmptyIsSpace = true
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m.StringEmptyByte = '.'
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seen := make(map[h.Coordinate]bool)
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start, _ := m.FindFirst('S')
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m.Put(start, '.')
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result := []h.Coordinate{start}
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steps := 26501365
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for i := 0; i < steps; i++ {
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fmt.Println(h.CLEAR_SCREEN)
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fmt.Printf("%d/%d (%f)\n", i, steps, float64(i)/float64(steps))
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seen, result = findNextInfiniteRepeat(&m, seen, result)
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if i == 100 {
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break
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}
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}
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fmt.Println("# Part 2")
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fmt.Println(len(result))
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for i := range result {
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m.Put(result[i], 'O')
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}
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fmt.Println(m)
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// It's making a diamond shape...
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}
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func findNext(m *h.CoordByteMap, curr []h.Coordinate) []h.Coordinate {
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var result []h.Coordinate
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for _, c := range curr {
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for _, tst := range []h.Coordinate{
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c.North(), c.East(), c.South(), c.West(),
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} {
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if m.ContainsCoord(tst) && m.Get(tst) == '.' {
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var contains bool
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for i := range result {
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||||
if result[i].Equals(tst) {
|
||||
contains = true
|
||||
break
|
||||
}
|
||||
}
|
||||
if !contains {
|
||||
result = append(result, tst)
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
return result
|
||||
}
|
||||
|
||||
func findNextInfiniteRepeat(m *h.CoordByteMap, seen map[h.Coordinate]bool, curr []h.Coordinate) (map[h.Coordinate]bool, []h.Coordinate) {
|
||||
var result []h.Coordinate
|
||||
for _, c := range curr {
|
||||
for _, tst := range []h.Coordinate{
|
||||
c.North(), c.East(), c.South(), c.West(),
|
||||
} {
|
||||
if seen[tst] {
|
||||
continue
|
||||
}
|
||||
wrkX, wrkY := tst.X, tst.Y
|
||||
for wrkX < m.TLX {
|
||||
wrkX += m.BRX
|
||||
}
|
||||
for wrkY < m.TLY {
|
||||
wrkY += m.BRY
|
||||
}
|
||||
wrk := h.Coordinate{X: (wrkX % m.BRX), Y: (wrkY % m.BRY)}
|
||||
if m.Get(wrk) == '.' {
|
||||
var contains bool
|
||||
for i := range result {
|
||||
if result[i].Equals(tst) {
|
||||
contains = true
|
||||
break
|
||||
}
|
||||
}
|
||||
if !contains {
|
||||
result = append(result, tst)
|
||||
seen[tst] = true
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
return seen, result
|
||||
}
|
||||
11
2023/day21/testinput
Normal file
11
2023/day21/testinput
Normal file
@@ -0,0 +1,11 @@
|
||||
...........
|
||||
.....###.#.
|
||||
.###.##..#.
|
||||
..#.#...#..
|
||||
....#.#....
|
||||
.##..S####.
|
||||
.##..#...#.
|
||||
.......##..
|
||||
.##.#.####.
|
||||
.##..##.##.
|
||||
...........
|
||||
Reference in New Issue
Block a user