adventofcode2021/day01/part1.nim

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Nim
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2021-12-01 18:46:57 +01:00
# Copyright 2021 Christian Ulrich
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
# usage: ./part1 < input
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import strutils
proc countIncreases(): uint =
var
line = ""
prevDepth = high(uint)
while readLine(stdin, line):
if line.len() > 0:
let depth = parseUint(line)
if depth > prevDepth:
result.inc()
prevDepth = depth
proc main(): int =
try:
echo countIncreases()
except ValueError:
result = -1
when isMainModule:
quit(main())