71 lines
2.1 KiB
Python
71 lines
2.1 KiB
Python
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#!/usr/bin/env python
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import sys
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from typing import Union
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FileSystem = dict[str, Union[int, "FileSystem"]]
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def solve(input: list[str]) -> int:
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def build_tree(input: list[str], i: int = 0) -> tuple[FileSystem, int]:
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fs: FileSystem = {}
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while i < len(input):
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assert input[i][0] == "$" # Sanity check
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command = input[i].split()[1:]
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if command[0] == "ls":
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while (i := i + 1) < len(input):
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if input[i][0] == "$":
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break
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else:
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type, name = input[i].split()
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if type == "dir":
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continue
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fs[name] = int(type)
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elif command[0] == "cd":
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if command[1] == "..":
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i += 1
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break
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else:
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fs[command[1]], i = build_tree(input, i + 1)
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else:
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assert False # Sanity check
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return fs, i
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def total_size(
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fs: FileSystem, parent_path: str = ""
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) -> dict[str, tuple[int, bool]]:
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sizes: dict[str, tuple[int, bool]] = {}
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for f, content in fs.items():
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path = f"{parent_path}/{f}"
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if isinstance(content, int):
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sizes[path] = content, False
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elif isinstance(content, dict):
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children_sizes = total_size(content, path)
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total = sum(children_sizes[f"{path}/{c}"][0] for c in content.keys())
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sizes[path] = total, True
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sizes.update(children_sizes)
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else:
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assert False # Sanity check
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return sizes
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fs, i = build_tree(input)
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assert i == len(input) # Sanity check
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sizes = total_size(fs)
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THRESHOLD = 30000000 - (70000000 - sizes["//"][0])
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assert THRESHOLD > 0 # Sanity check
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return min(size for size, is_dir in sizes.values() if is_dir and size >= THRESHOLD)
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def main() -> None:
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input = sys.stdin.read().splitlines()
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print(solve(input))
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if __name__ == "__main__":
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main()
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