40 lines
975 B
Nim
40 lines
975 B
Nim
import ./common, std/[strutils, hashes, sugar, strformat]
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proc p1(input: Lines): uint64 =
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var h = input.len
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var w = input[0].len
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var cukes = input
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while true:
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var nextCukes = cukes
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let startHash = cukes.hash
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for y,line in cukes.pairs:
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for x,c in line.pairs:
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let tx = if x >= w - 1: 0 else: x + 1
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if c == '>' and cukes[y][tx] == '.':
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nextCukes[y][x] = '.'
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nextCukes[y][tx] = '>'
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cukes = nextCukes
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for y,line in cukes.pairs:
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for x,c in line.pairs:
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let ty = if y >= h - 1: 0 else: y + 1
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if c == 'v' and cukes[ty][x] == '.':
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nextCukes[y][x] = '.'
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nextCukes[ty][x] = 'v'
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inc result
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if nextCukes.hash == startHash: break
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cukes = nextCukes
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proc p2(input: Lines): uint64 =
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0
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doDayX 25, (n: int) => n.loadInput, p1, p2, ("""v...>>.vv>
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.vv>>.vv..
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>>.>v>...v
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>>v>>.>.v.
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v>v.vv.v..
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>.>>..v...
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.vv..>.>v.
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v.v..>>v.v
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....v..v.>""".split('\n'), 58'u64, 0'u64)
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