Day 11 done
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c9896ab4e6
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@ -44,15 +44,15 @@ proc doDay*[T](
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expectedPart1: int,
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expectedPart2: int): void =
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time(&"day {day} part 1"): echo day.inputLoader().part1()
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# time(&"day {day} part 2"): echo day.inputLoader().part2()
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time(&"day {day} part 2"): echo day.inputLoader().part2()
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when not defined(release):
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var p1 = testInput.part1()
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echo p1
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doAssert p1 == expectedPart1
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# var p2 = testInput.part2()
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# echo p2
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# doAssert p2 == expectedPart2
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var p2 = testInput.part2()
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echo p2
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doAssert p2 == expectedPart2
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proc reduce*[T, X](s: openArray[T], op: (X, T) -> X, init: X): X =
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result = init
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@ -39,7 +39,45 @@ proc octopi(input: seq[seq[int]]): int =
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for f in allFlashes.items():
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o[f[0]][f[1]] = 0
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doDay 11, n => n.loadInput().toGrid(), octopi, octopi,
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proc octopiUntilAll(input: seq[seq[int]]): int =
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var o = input
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let h = o.len
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let w = o[0].len
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# echo &"w{w} h{h}"
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for n in 1..1000000:
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# for nums in o:
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# echo nums.mapIt($it).join()
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# echo n
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var allFlashes = toHashSet[(int, int)] []
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var flashes = toHashSet[(int, int)] []
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for y in 0..<h:
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for x in 0..<w:
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# inc and check flashes
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inc o[y][x]
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if o[y][x] > 9:
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# echo &"Flash {y}, {x}"
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inc result
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flashes.incl (y, x)
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allFlashes.incl (y, x)
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while flashes.len > 0:
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let (y, x) = flashes.pop
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# echo &"Handling flash {y}, {x}"
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for p in product @[@[y-1, y, y+1], @[x-1, x, x+1]]:
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let (fy, fx) = (p[0], p[1])
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if fx < 0 or fy < 0 or fx >= w or fy >= h or (fx == x and fy == y): continue
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# inc and check flashes
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inc o[fy][fx]
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if o[fy][fx] > 9 and not allFlashes.contains (fy, fx):
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# echo &"Subflash {fy}, {fx}"
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inc result
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flashes.incl (fy, fx)
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allFlashes.incl (fy, fx)
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if allFlashes.len() == (w * h):
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return n
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for f in allFlashes.items():
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o[f[0]][f[1]] = 0
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doDay 11, n => n.loadInput().toGrid(), octopi, octopiUntilAll,
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@[
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"5483143223",
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"2745854711",
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@ -51,4 +89,4 @@ doDay 11, n => n.loadInput().toGrid(), octopi, octopi,
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"6882881134",
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"4846848554",
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"5283751526",
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].toGrid(), 1656, 288957
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].toGrid(), 1656, 195
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