2 files changed, 34 insertions(+), 0 deletions(-)

A day03/day03.py
A day03/day03.test

@@ 0,0 1,28 @@
+#! /usr/bin/env python3
+# vim:fenc=utf-8
+#
+# Copyright © 2022 Adrian Perez de Castro <aperez@igalia.com>
+#
+# Distributed under terms of the MIT license.
+
+def find_common_item(line):
+    assert len(line) % 2 == 0
+    nitems = len(line) // 2
+    common = frozenset(line[:nitems]) & frozenset(line[nitems:])
+    assert len(common) == 1
+    for item in common:
+        return item
+
+def item_priority(item):
+    item = ord(item)
+    if ord('a') <= item <= ord('z'):
+        return item - ord('a') + 1
+    elif ord('A') <= item <= ord('Z'):
+        return item - ord('A') + 27
+    else:
+        assert False, "unreachable"
+
+import sys
+
+print(sum((item_priority(item) for item in (find_common_item(line.strip()) for
+                                            line in sys.stdin.readlines()))))

@@ 0,0 1,6 @@
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