From d3eacd48aa4283eeb08b743abd7aaf98f96f8516 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Mika=C3=ABl=20Capelle?= Date: Sun, 3 Dec 2023 09:09:25 +0100 Subject: [PATCH] 2023 day 3. --- 2023/day3.py | 49 +++++++++++++++ 2023/inputs/day3.txt | 140 +++++++++++++++++++++++++++++++++++++++++++ 2023/tests/day3.txt | 10 ++++ 3 files changed, 199 insertions(+) create mode 100644 2023/day3.py create mode 100644 2023/inputs/day3.txt create mode 100644 2023/tests/day3.txt diff --git a/2023/day3.py b/2023/day3.py new file mode 100644 index 0000000..a2909d7 --- /dev/null +++ b/2023/day3.py @@ -0,0 +1,49 @@ +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}") diff --git a/2023/inputs/day3.txt b/2023/inputs/day3.txt new file mode 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