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2023 day 3.

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This commit is contained in:
Mikaël Capelle 2023-12-03 09:09:25 +01:00
parent 98f605f30e
commit fd777627d6
3 changed files with 199 additions and 0 deletions
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import string
import sys
from collections import defaultdict
lines = list(filter(bool, sys.stdin.read().split("\n")))
values: list[int] = []
gears: dict[tuple[int, int], list[int]] = defaultdict(list)
for i, line in enumerate(lines):
j = 0
while j < len(line):
# skip everything until a digit is found (start of a number)
if line[j] not in string.digits:
j += 1
continue
# extract the range of the number and its value
k = j + 1
while k < len(line) and line[k] in string.digits:
k += 1
value = int(line[j:k])
# lookup around the number if there is a symbol - we go through the number
# itself but that should not matter since it only contains digits
found = False
for i2 in range(max(0, i - 1), min(i + 1, len(lines) - 1) + 1):
for j2 in range(max(0, j - 1), min(k, len(line) - 1) + 1):
assert i2 >= 0 and i2 < len(lines)
assert j2 >= 0 and j2 < len(line)
if lines[i2][j2] != "." and lines[i2][j2] not in string.digits:
found = True
if lines[i2][j2] == "*":
gears[i2, j2].append(value)
if found:
values.append(value)
# continue starting from the end of the number
j = k
answer_1 = sum(values)
answer_2 = sum(v1 * v2 for v1, v2 in filter(lambda vs: len(vs) == 2, gears.values()))
print(f"answer 1 is {answer_1}")
print(f"answer 2 is {answer_2}")

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467..114..
...*......
..35..633.
......#...
617*......
.....+.58.
..592.....
......755.
...$.*....
.664.598..