43 lines
1.2 KiB
Nim
43 lines
1.2 KiB
Nim
# 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: ./part2 < input
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import algorithm
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import math
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import strutils
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const WindowSize = 3
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proc countIncreases(): uint =
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var
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line = ""
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window: array[WindowSize + 1, uint]
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while readLine(stdin, line):
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if line.len() > 0:
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window.rotateLeft(1)
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window[^1] = parseUint(line)
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if window[0] > 0 and sum(window[1 .. ^1]) > sum(window[0 .. ^2]):
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result.inc()
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proc main(): int =
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try:
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echo countIncreases()
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except ValueError:
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result = -1
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when isMainModule:
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quit(main())
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