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: ./part2 < input
|
|
|
|
|
|
2021-12-01 18:24:20 +01:00
|
|
|
import algorithm
|
|
|
|
|
import math
|
|
|
|
|
import strutils
|
|
|
|
|
|
|
|
|
|
const WindowSize = 3
|
|
|
|
|
|
|
|
|
|
proc countIncreases(): uint =
|
|
|
|
|
var
|
|
|
|
|
line = ""
|
|
|
|
|
window: array[WindowSize + 1, uint]
|
|
|
|
|
while readLine(stdin, line):
|
|
|
|
|
if line.len() > 0:
|
|
|
|
|
window.rotateLeft(1)
|
|
|
|
|
window[^1] = parseUint(line)
|
|
|
|
|
if window[0] > 0 and sum(window[1 .. ^1]) > sum(window[0 .. ^2]):
|
|
|
|
|
result.inc()
|
|
|
|
|
|
|
|
|
|
proc main(): int =
|
|
|
|
|
try:
|
|
|
|
|
echo countIncreases()
|
|
|
|
|
except ValueError:
|
|
|
|
|
result = -1
|
|
|
|
|
|
|
|
|
|
when isMainModule:
|
|
|
|
|
quit(main())
|
