33 lines
785 B
Python
Executable file
33 lines
785 B
Python
Executable file
#!/usr/bin/env python
|
|
|
|
import functools
|
|
import sys
|
|
|
|
|
|
def solve(input: str) -> int:
|
|
def parse(input: str) -> tuple[frozenset[str], list[str]]:
|
|
towels, patterns = input.split("\n\n")
|
|
return frozenset(towels.split(", ")), patterns.splitlines()
|
|
|
|
@functools.cache
|
|
def is_possible(pattern: str, towels: frozenset[str]) -> bool:
|
|
if pattern == "":
|
|
return True
|
|
return any(
|
|
is_possible(pattern.removeprefix(towel), towels)
|
|
for towel in towels
|
|
if pattern.startswith(towel)
|
|
)
|
|
|
|
towels, patterns = parse(input)
|
|
return sum(is_possible(pattern, towels) for pattern in patterns)
|
|
|
|
|
|
def main() -> None:
|
|
input = sys.stdin.read()
|
|
print(solve(input))
|
|
|
|
|
|
if __name__ == "__main__":
|
|
main()
|