first attempt at 23, broken

dreiundzwanzig.py

@@ -0,0 +1,48 @@
+#!/usr/bin/env python3
+
+from useful import *
+
+DIRS = (-1, 0), (1, 0), (0, -1), (0, 1)
+UP, DOWN, LEFT, RIGHT = DIRS
+MUSTGO = {'<': LEFT, '>': RIGHT, '^': UP, 'v': DOWN}
+
+def hush(a):
+    return reduce(lambda u, v: u << 8 | v)
+
+def add(a, b):
+    return tuple(map(lambda u, v: u + v, a, b))
+
+def sub(a, b):
+    return tuple(map(lambda u, v: u - v, a, b))
+
+def mightgo(here, there):
+    if not (there[0] > 0 and there[1] > 0 and there[0] < h and there[1] < w):
+        return False
+    if kart[there] == '#':
+        return False
+    if kart[here] == '.':
+        return True
+    step = sub(there, here)
+    return step == MUSTGO[step]
+
+def cango(here, there, path):
+    return mightgo(here, there) and there not in path
+
+kart = np.asarray([[c for c in l] for l in lines(open(0))])
+h, w = kart.shape
+beg, fin = [(i, np.argmax(kart[i] == '.')) for i in (0, h - 1)]
+
+q = deque()
+q += [(add(beg, DOWN), {hush(beg): True}, 1), ] # pos, path so far, distance covered
+
+while q:
+    pos, path, dist = q.popleft()
+    if pos == fin:
+        best = max(best, dist)
+        continue
+    for d in DIRS:
+        nextpos = add(pos, d)
+        if cango(pos, nextpos, path):
+            q += [(nextpos, path | {pos: True}, dist + 1), ]
+
+print(best)

input23

@@ -0,0 +1,141 @@
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test23

@@ -0,0 +1,23 @@
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