AoC 2023 day 9, part 2

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Síle Ekaterin Liszka 2023-12-09 15:33:14 -08:00
parent afaa4b1f2c
commit 5d80ecbf2b
Signed by: VulpineAmethyst
SSH Key Fingerprint: SHA256:VcHwQ6SUfi/p0Csfxe3SabX/TImWER0PhoJqkt+GlmE
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9/b.py Executable file
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#!/usr/bin/env python3
# Copyright 2023 Síle Ekaterin Liszka
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
# FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
# IN THE SOFTWARE.
patterns = []
with open('input.txt', mode='r') as f:
for line in f.readlines():
patterns.append(tuple([int(x) for x in line[:-1].split(' ')]))
def diff(pattern):
return [pattern[x] - pattern[x - 1] for x in range(1, len(pattern))]
pnext = {}
for pattern in patterns:
diffs = [list(reversed(pattern))]
x = list(reversed(pattern))
while x := diff(x):
diffs.append(x)
if sum(x) == 0:
break
diffs.reverse()
for i in range(1, len(diffs)):
diffs[i].append(diffs[i - 1][-1] + diffs[i][-1])
pnext[pattern] = diffs[-1][-1]
print(sum(pnext.values()))