Add day 13.

This commit is contained in:
Mikael CAPELLE 2022-12-13 08:54:15 +01:00
parent c7ef505f1b
commit 652756a341
3 changed files with 516 additions and 0 deletions

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@ -12,6 +12,20 @@ def dijkstra(
neighbors: Callable[[Node], Iterator[Node]], neighbors: Callable[[Node], Iterator[Node]],
cost: Callable[[Node, Node], float], cost: Callable[[Node, Node], float],
) -> tuple[dict[Node, float], dict[Node, Node]]: ) -> tuple[dict[Node, float], dict[Node, Node]]:
"""
Compute shortest paths from one node to all reachable ones.
Args:
start: Starting node.
neighbors: Function returning the neighbors of a node.
cost: Function to compute the cost of an edge.
Returns:
A tuple (lengths, parents) where lengths is a mapping from Node to distance
(from the starting node) and parents a mapping from parents Node (in the
shortest path). If keyset of lengths and parents is the same. If a Node is not
in the mapping, it cannot be reached from the starting node.
"""
queue: list[tuple[float, Node]] = [] queue: list[tuple[float, Node]] = []

53
2022/day13.py Normal file
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@ -0,0 +1,53 @@
# -*- encoding: utf-8 -*-
import json
import sys
from functools import cmp_to_key
blocks = sys.stdin.read().strip().split("\n\n")
pairs = [tuple(json.loads(p) for p in block.split("\n")) for block in blocks]
def compare(lhs: list[int | list], rhs: list[int | list]) -> int:
if len(lhs) != len(rhs):
m = min(len(lhs), len(rhs))
r = compare(lhs[:m], rhs[:m])
if r != 0:
return r
else:
return 1 if len(rhs) > len(lhs) else -1
else:
for lhs_a, rhs_a in zip(lhs, rhs):
if isinstance(lhs_a, int) and isinstance(rhs_a, int):
if lhs_a != rhs_a:
return 1 if rhs_a > lhs_a else -1
elif isinstance(lhs_a, list) and isinstance(rhs_a, list):
r = compare(lhs_a, rhs_a)
if r != 0:
return r
else:
if not isinstance(lhs_a, list):
lhs_a = [lhs_a]
else:
assert isinstance(rhs_a, int)
rhs_a = [rhs_a]
assert isinstance(rhs_a, list)
r = compare(lhs_a, rhs_a)
if r != 0:
return r
return 0
answer_1 = sum(i + 1 for i, (lhs, rhs) in enumerate(pairs) if compare(lhs, rhs) == 1)
print(f"answer_1 is {answer_1}")
dividers = [[[2]], [[6]]]
packets = [packet for packets in pairs for packet in packets]
packets.extend(dividers)
packets = list(reversed(sorted(packets, key=cmp_to_key(compare))))
d_index = [packets.index(d) + 1 for d in dividers]
print(f"answer 2 is {d_index[0] * d_index[1]}")

449
2022/inputs/day13.txt Normal file
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@ -0,0 +1,449 @@
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