Advent Of Code

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An unofficial home for the advent of code community on programming.dev!

Advent of Code is an annual Advent calendar of small programming puzzles for a variety of skill sets and skill levels that can be solved in any programming language you like.

AoC 2023

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18	19	20	21	22	23	24
25

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🎄 - 2023 DAY 25 SOLUTIONS -🎄 (programming.dev)

submitted 8 months ago* (last edited 8 months ago) by [email protected] to c/[email protected]

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Day 25: Snowverload

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[–] [email protected] 1 points 7 months ago

Python

import networkx as nx

from .solver import Solver


class Day25(Solver):

  def __init__(self):
    super().__init__(25)

  def presolve(self, input: str):
    self.graph = nx.Graph()
    for line in input.splitlines():
      from_, to_line = line.split(': ')
      for to in to_line.split(' '):
        self.graph.add_edge(from_, to)

  def solve_first_star(self) -> int | str:
    cut_value, partition = nx.algorithms.stoer_wagner(self.graph)
    return len(partition[0]) * len(partition[1])