47 lines
901 B
Python
Executable file
47 lines
901 B
Python
Executable file
#!/usr/bin/env python
|
|
|
|
import itertools
|
|
import sys
|
|
from collections import defaultdict
|
|
from typing import Dict, List, Set
|
|
|
|
Map = Dict[str, Set[str]]
|
|
|
|
|
|
def solve(input: List[str]) -> int:
|
|
def parse() -> Map:
|
|
res: Map = defaultdict(set)
|
|
|
|
for (start, to) in map(lambda s: s.split("-"), input):
|
|
res[start].add(to)
|
|
res[to].add(start)
|
|
|
|
return res
|
|
|
|
caves = parse()
|
|
|
|
def dfs(start: str, seen: Set[str] = set()) -> int:
|
|
if start == "end":
|
|
return 1
|
|
|
|
seen = seen | {start}
|
|
res = 0
|
|
|
|
for dest in caves[start]:
|
|
if dest in seen and dest.islower():
|
|
continue
|
|
res += dfs(dest, seen)
|
|
|
|
return res
|
|
|
|
return dfs("start")
|
|
|
|
|
|
def main() -> None:
|
|
input = [line.strip() for line in sys.stdin.readlines()]
|
|
print(solve(input))
|
|
|
|
|
|
if __name__ == "__main__":
|
|
main()
|