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https://github.com/Crocmagnon/advent-of-code.git
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63 lines
1.6 KiB
Python
63 lines
1.6 KiB
Python
from dataclasses import dataclass
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from typing import Dict
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@dataclass
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class Node:
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name: str
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orbits_over: "Node" = None
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def is_origin(self) -> bool:
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return self.name.lower() == "com"
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def count_hops(self):
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return len(self.chain()) - 1 # Not counting self but it's part of the chain
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def chain(self):
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chain = [self]
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current = self
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while not current.is_origin():
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current = current.orbits_over
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chain.append(current)
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return chain
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def common_chain(self, other: "Node") -> list["Node"]:
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chain = []
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for el1, el2 in zip(reversed(self.chain()), reversed(other.chain())):
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if el1 != el2:
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break
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chain.append(el1)
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return chain
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def __str__(self) -> str:
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if self.orbits_over:
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return f"{self.orbits_over.name}){self.name}"
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else:
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return self.name
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def __eq__(self, other: "Node") -> bool:
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return self.name == other.name
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def main():
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with open("inputs/day06") as f:
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orbits = f.read().split()
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objects = dict() # type: Dict[str, Node]
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for orbit in orbits:
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stator, rotor = orbit.split(")")
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stator = objects.get(stator, Node(name=stator))
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rotor = objects.get(rotor, Node(name=rotor))
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rotor.orbits_over = stator
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objects[stator.name] = stator
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objects[rotor.name] = rotor
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me = objects["YOU"]
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santa = objects["SAN"]
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print(me.count_hops() + santa.count_hops() - 2 * len(me.common_chain(santa)))
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if __name__ == "__main__":
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main()
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