advent-of-code/2021/nim/day25.nim

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import ./common, std/[strutils, hashes, sugar, strformat]
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proc p1(input: Lines): uint64 =
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var h = input.len
var w = input[0].len
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var cukes = input
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while true:
echo result
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var nextCukes = cukes
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if result < 4:
echo nextCukes.join("\n")
echo ""
let startHash = nextCukes.hash
for y,line in nextCukes.pairs:
for x,c in line.pairs:
let tx = if x >= w - 1: 0 else: x + 1
if c == '>' and nextCukes[y][tx] == '.':
echo &"{x}, {y} going right"
nextCukes[y][x] = '.'
nextCukes[y][tx] = 'r'
for y,line in cukes.pairs:
for x,c in line.pairs:
let ty = if y >= h - 1: 0 else: y + 1
if c == 'v' and nextCukes[ty][x] == '.':
echo &"{x}, {y} going down"
nextCukes[y][x] = 'u'
nextCukes[ty][x] = 'v'
for y,line in nextCukes.pairs:
for x,c in line:
if c == 'u': nextCukes[y][x] = '.'
elif c == 'r': nextCukes[y][x] = '>'
if nextCukes.hash == startHash: break
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cukes = nextCukes
inc result
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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>
.vv>>.vv..
>>.>v>...v
>>v>>.>.v.
v>v.vv.v..
>.>>..v...
.vv..>.>v.
v.v..>>v.v
....v..v.>""".split('\n'), 58'u64, 0'u64)