1 files changed, 51 insertions, 0 deletions
diff --git a/2025/day11.py b/2025/day11.py
new file mode 100755
index 0000000..5e9df65
--- /dev/null
+++ b/2025/day11.py
@@ -0,0 +1,51 @@
+#!/usr/bin/env python3
+from functools import reduce
+from re import findall
+from copy import deepcopy
+import sys
+# import numpy as np
+
+filename = sys.argv[1] if len(sys.argv) == 2 \
+    else "in/" + sys.argv[0].split('/')[-1].rstrip(".py") + ".pzl"
+data = open(filename).read()
+lines = data.rstrip('\n').split('\n')
+
+D = dict()
+for line in lines:
+    l, r = line.split(':')
+    r = r.strip().split(' ')
+    if l in D:
+        assert False
+    D[l] = r
+
+def dfs(start, end, visited, D, depth=0):
+    if start in visited:
+        return 0
+    visited.add(start)
+
+    if start == end:
+        return 1
+
+    s = 0
+    if start in D:
+        for node in D[start]:
+            s += dfs(node, end, visited.copy(), D, depth+1)
+    else:
+        if start != 'out':
+            print('end of path', start)
+    return s
+res1 = dfs('you', 'out', set(), D)
+
+# export graphviz
+# for l in D:
+#     for r in D[l]:
+#         print(f"{l} -> {r}");
+
+p1 = dfs('svr', 'fft' , set(['rmc', 'ibq', 'zdx', 'foc']), D)
+p2 = dfs('fft', 'dac' , set(['iwg', 'kxp', 'fnk', 'you']), D)
+p3 = dfs('dac', 'out' , set(), D)
+res2 = p1 * p2 * p3
+
+print('res1:', res1)
+print('res2:', res2)
+