day 2

2/2.py

@@ -0,0 +1,31 @@
+#!/usr/bin/env python3
+
+
+from collections import defaultdict
+
+
+def main():
+    twofers = 0
+    threefers = 0
+    with open("boxes.txt") as f:
+        for line in f.readlines():
+            letters = defaultdict(int)
+            for letter in line.strip():
+                letters[letter] += 1
+            is_twofer = False
+            is_threefer = False
+            for k, v in letters.items():
+                if v == 2:
+                    is_twofer = True
+                if v == 3:
+                    is_threefer = True
+            if is_twofer:
+                twofers += 1
+            if is_threefer:
+                threefers += 1
+
+    print(twofers * threefers)
+
+
+if __name__ == '__main__':
+    main()

2/2b.py

@@ -0,0 +1,26 @@
+#!/usr/bin/env python3
+
+
+from itertools import combinations
+
+
+def main():
+    with open("boxes.txt") as f:
+        boxids = [l.strip() for l in f.readlines()]
+
+    for a, b in combinations(boxids, 2):
+        diffs = 0
+        for i, c in enumerate(a):
+            if b[i] != c:
+                diffs += 1
+        if diffs == 1:
+            common = []
+            for i, c in enumerate(a):
+                if b[i] == c:
+                    common.append(c)
+            print(''.join(common))
+            return
+
+
+if __name__ == '__main__':
+    main()

2/boxes.txt

@@ -0,0 +1,250 @@
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