13a

test13

@@ -0,0 +1,15 @@
+#.##..##.
+..#.##.#.
+##......#
+##......#
+..#.##.#.
+..##..##.
+#.#.##.#.
+
+#...##..#
+#....#..#
+..##..###
+#####.##.
+#####.##.
+..##..###
+#....#..#

thirteen.py

@@ -0,0 +1,23 @@
+#!/usr/bin/env python3
+
+from useful import *
+
+def is_mirror(pic, axis):
+    a = pic[:axis]
+    b = pic[i:i*2][::-1]
+    c = a == b
+    return c.all()
+
+ms = [np.array([[c == '#' for c in l] for l in p.strip().split()]) for p in pgphs(open(0).read())]
+score = 0
+for m in ms:
+    for tran, scoretran in ((lambda a: a, lambda n, h: n * 100),
+                            (lambda a: a[::-1], lambda n, h: (h - n) * 100),
+                            (lambda a: a.T, lambda n, h: n),
+                            (lambda a: a.T[::-1], lambda n, h: h - n),):
+        height = tran(m).shape[0]
+        for i in range(1, height // 2 + 1):
+            if is_mirror(tran(m), i):
+                #ic(tran, i, draw(m))
+                score += scoretran(i, height)
+print(score)