2018 day 2

2018/2/part1.py

@@ -0,0 +1,12 @@
+#!/usr/bin/env python3
+import fileinput
+from collections import Counter
+
+
+def main():
+    n2, n3 = map(sum, zip(*map(lambda c: (2 in c.values(), 3 in c.values()), map(Counter, map(str.strip, fileinput.input())))))
+    return n2 * n3
+
+
+if __name__ == '__main__':
+    print(main())

2018/2/part2.py

@@ -0,0 +1,17 @@
+#!/usr/bin/env python3
+import fileinput
+from collections import Counter
+
+
+def main():
+    ids = set(map(str.strip, fileinput.input()))
+
+    for i in range(len(ids)):
+        sliced = [boxid[:i] + boxid[i+1:] for boxid in ids]
+        if len(set(sliced)) == len(ids):
+            continue
+        return next(k for k, v in Counter(sliced).items() if v > 1)
+
+
+if __name__ == '__main__':
+    print(main())