add 2022/day03

2022/03/main.py

@@ -0,0 +1,47 @@
+#!/usr/bin/env python
+# -*- encoding: utf-8; py-indent-offset: 4 -*-
+
+# Author: Sebastian Mark
+# CC-BY-SA (https://creativecommons.org/licenses/by-sa/4.0/deed.de)
+
+# pylint: disable=missing-module-docstring,missing-function-docstring,consider-using-f-string
+
+
+def readinput():
+    with open("input", "r", encoding="utf-8") as file:
+        lines = [line.strip() for line in file.readlines()]
+    return lines
+
+
+def charvalue(char: str) -> int:
+    values = "_abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
+    return values.index(char)
+
+
+def main():
+    rucksacks = readinput()
+
+    # part 1
+    prios = 0
+    for rucksack in rucksacks:
+        middle = len(rucksack) // 2
+        left = rucksack[middle:]
+        right = rucksack[:middle]
+        common = set(left) & set(right)
+        for char in common:
+            prios += charvalue(char)
+    print("Rucksacks priorities: %d" % prios)
+
+    # part 2
+    prios = 0
+    i = 0
+    while i <= len(rucksacks) - 3:
+        common = set(rucksacks[i]) & set(rucksacks[i + 1]) & set(rucksacks[i + 2])
+        for char in common:
+            prios += charvalue(char)
+        i += 3
+    print("Group rucksacks priorities: %d" % prios)
+
+
+if __name__ == "__main__":
+    main()