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Solve day12 part 2
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1 changed files with 18 additions and 4 deletions
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@ -1,6 +1,7 @@
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from __future__ import annotations
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import dataclasses
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import math
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import networkx as nx
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from networkx.algorithms.shortest_paths.generic import shortest_path
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@ -43,6 +44,7 @@ class Hill:
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end: Cell
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width: int
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height: int
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potential_starters: list[Cell]
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graph: nx.DiGraph = None
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def top(self, cell: Cell) -> Cell | None:
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@ -97,6 +99,7 @@ def parse_data(data: list[str]) -> DataType:
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end_cell = None
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height = len(data)
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width = len(data[0])
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potential_starters = []
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for y, row in enumerate(data):
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for x, char in enumerate(row):
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start, end = False, False
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@ -113,7 +116,9 @@ def parse_data(data: list[str]) -> DataType:
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elif end:
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end_cell = cell
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cells.append(cell)
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hill = Hill(cells, start_cell, end_cell, width, height)
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if char == "a":
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potential_starters.append(cell)
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hill = Hill(cells, start_cell, end_cell, width, height, potential_starters)
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hill.build_graph()
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return hill
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@ -124,9 +129,18 @@ def solve_part_1(data: DataType) -> int:
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def solve_part_2(data: DataType) -> int:
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return 0
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min_length = math.inf
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for candidate in data.potential_starters:
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try:
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path = shortest_path(data.graph, candidate, data.end)
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path_length = len(path)
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except nx.NetworkXNoPath:
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path_length = math.inf
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if path_length < min_length:
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min_length = path_length
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return min_length - 1
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if __name__ == "__main__":
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main("inputs/day12-test1", expected_part_1=31)
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main("inputs/day12", expected_part_1=456)
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main("inputs/day12-test1", expected_part_1=31, expected_part_2=29)
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main("inputs/day12", expected_part_1=456, expected_part_2=454)
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