76 lines
2.5 KiB
Nim
76 lines
2.5 KiB
Nim
import ./common, std/[sequtils, algorithm, sugar, sets, strformat, strutils, tables, options, json, hashes]
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type
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Point = (int, int)
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Image = object
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pixels: TableRef[Point, bool]
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topLeft: Point
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bottomRight: Point
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infinite: bool
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proc parse(s: openArray[string]): Image =
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var pixels = newTable[Point, bool]()
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for y,l in s.pairs:
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for x,c in l:
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pixels[(x, y)] = c == '#'
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return Image(topLeft: (0, 0), bottomRight: (s[0].len-1, s.len-1), pixels: pixels, infinite: false)
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proc enhance(image: var Image, algo: string) =
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var (tlx, tly) = image.topLeft
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var (brx, bry) = image.bottomRight
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var newPixels = newTable[Point, bool]()
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var xr = tlx-1..brx+1
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var yr = tly-1..bry+1
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for x in xr:
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for y in yr:
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var sample = 0
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for sy in y-1..y+1:
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for sx in x-1..x+1:
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if image.pixels.getOrDefault((sx, sy), image.infinite):
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inc sample
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sample = sample shl 1
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sample = sample shr 1
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# echo &"{x}, {y} => {sample}"
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newPixels[(x, y)] = algo[sample] == '#'
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if x < tlx: tlx = x
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if y < tly: tly = y
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if x > brx: brx = x
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if y > bry: bry = y
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image.topLeft = (tlx, tly)
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image.bottomRight = (brx, bry)
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image.pixels = newPixels
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if image.infinite:
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image.infinite = algo[^1] == '#'
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else:
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image.infinite = algo[0] == '#'
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proc `$`(image: Image): string =
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var s: seq[string] = @[]
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var (tlx, tly) = image.topLeft
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var (brx, bry) = image.bottomRight
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for _ in tly..bry:
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s.add ".".repeat((brx-tlx)+1)
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for p in image.pixels.keys:
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let (x, y) = p
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if image.pixels[p]: s[y-tly][x-tlx] = '#'
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s.join("\n")
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proc solver(input: Lines, times: int): uint64 =
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let algo = input[0]
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var image = input[2..^1].parse()
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for _ in 1..times: image.enhance algo
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for v in image.pixels.values:
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if v: inc result
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proc p1(input: Lines): uint64 = input.solver(2)
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proc p2(input: Lines): uint64 = input.solver(50)
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const input = """
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..#.#..#####.#.#.#.###.##.....###.##.#..###.####..#####..#....#..#..##..###..######.###...####..#..#####..##..#.#####...##.#.#..#.##..#.#......#.###.######.###.####...#.##.##..#..#..#####.....#.#....###..#.##......#.....#..#..#..##..#...##.######.####.####.#.#...#.......#..#.#.#...####.##.#......#..#...##.#.##..#...##.#.##..###.#......#.#.......#.#.#.####.###.##...#.....####.#..#..#.##.#....##..#.####....##...##..#...#......#.#.......#.......##..####..#...#.#.#...##..#.#..###..#####........#..####......#..#
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#..#.
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#....
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##..#
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..#..
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..### """.strip().split('\n')
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doDayX 20, (n: int) => n.loadInput, p1, p2, (input, 35'u64, 3351'u64)
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