Tasks 01-14

12/12.py

@@ -0,0 +1,57 @@
+from timeit import timeit
+data = """
+fs-end
+he-DX
+fs-he
+start-DX
+pj-DX
+end-zg
+zg-sl
+zg-pj
+pj-he
+RW-he
+fs-DX
+pj-RW
+zg-RW
+start-pj
+he-WI
+zg-he
+pj-fs
+start-RW
+""".strip().split('\n')
+
+with open("input") as f:
+    data = f.read().strip().split('\n')
+
+d = {tuple(line.split('-')) for line in data}
+small = {x for pair in d for x in pair if x.islower()} - {'start', 'end'}
+
+
+def make_paths(d, valid_path):
+    def f(v, path):
+        if path.count('start')>1:
+            return
+        if not valid_path(path):
+            return
+        if v=='end':
+            yield path
+            return
+        for next_v in {x for x, y in d if y==v}|{y for x, y in d if x==v}:
+            yield from f(next_v, path+[next_v])
+    yield from f('start', ['start'])
+
+valid_path = lambda x: all(x.count(v)<=1 for v in small)
+print(sum(1 for p in make_paths(d, valid_path)))
+
+def valid_path(path):
+    if any(path.count(v)>2 for v in small):
+        return False
+    if sum(1 for v in small if path.count(v)==2)>1:
+        return False
+    return True
+
+print(timeit('print(sum(1 for p in make_paths(d, valid_path)))', globals=globals(), number=1))
+
+
+    
+

12/input

@@ -0,0 +1,26 @@
+start-YY
+av-rz
+rz-VH
+fh-av
+end-fh
+sk-gp
+ae-av
+YY-gp
+end-VH
+CF-qz
+qz-end
+qz-VG
+start-gp
+VG-sk
+rz-YY
+VH-sk
+rz-gp
+VH-av
+VH-fh
+sk-rz
+YY-sk
+av-gp
+rz-qz
+VG-start
+sk-fh
+VG-av