47 lines
1.3 KiB
Nim
47 lines
1.3 KiB
Nim
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# Copyright 2021 Christian Ulrich
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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# usage: ./part1 < input
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import sequtils
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import strutils
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const Days = 80
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proc predictLanternfishCount(): int =
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var
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timers = readLine(stdin).split(',').mapIt(uint8(parseUint(it)))
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newTimers: seq[uint8]
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for day in 0 ..< Days:
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newTimers.setLen(0)
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for timer in timers.mitems():
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if timer == 0'u8:
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newTimers.add(8'u8)
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timer = 6'u8
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else:
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timer.dec()
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timers.add(newTimers)
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result = timers.len()
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proc main(): int =
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try:
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echo predictLanternfishCount()
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except Exception as error:
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echo error.msg
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result = -1
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when isMainModule:
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quit(main())
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