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28 lines
563 B
Python
28 lines
563 B
Python
from typing import TextIO
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import networkx # type: ignore
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def read_graph(data: TextIO) -> networkx.DiGraph:
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graph = networkx.DiGraph()
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for line in data:
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a, b = line.strip().split(')')
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graph.add_edge(a, b)
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return graph
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def part1(data: TextIO) -> int:
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graph = read_graph(data)
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paths = networkx.single_source_shortest_path_length(graph, 'COM')
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return sum(paths.values())
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def part2(data: TextIO) -> int:
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graph = read_graph(data).to_undirected()
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return networkx.shortest_path_length(graph, 'YOU', 'SAN') - 2
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