mirror of
https://github.com/Crocmagnon/advent-of-code.git
synced 2024-11-05 14:23:58 +01:00
78 lines
2.5 KiB
Python
78 lines
2.5 KiB
Python
import re
|
|
from typing import List
|
|
|
|
import networkx as nx
|
|
|
|
|
|
def main(filename: str, expected_part_1: int = None, expected_part_2: int = None):
|
|
print(f"\n+ Running on {filename}")
|
|
with open(filename) as f:
|
|
rules = f.read().strip().split("\n") # type: List[str]
|
|
|
|
graph_part_1 = nx.DiGraph()
|
|
graph_part_2 = nx.DiGraph()
|
|
for rule in rules:
|
|
edges = extract_edges_from_rule(rule, container_first=False)
|
|
graph_part_1.add_weighted_edges_from(edges)
|
|
edges = extract_edges_from_rule(rule, container_first=True)
|
|
graph_part_2.add_weighted_edges_from(edges)
|
|
|
|
counter_part_1 = solve_part_1(graph_part_1)
|
|
counter_part_2 = solve_part_2(graph_part_2)
|
|
|
|
print(f"1. Found {counter_part_1}")
|
|
if expected_part_1:
|
|
assert expected_part_1 == counter_part_1
|
|
|
|
print(f"2. Found {counter_part_2}")
|
|
if expected_part_2:
|
|
assert expected_part_2 == counter_part_2
|
|
|
|
|
|
def extract_edges_from_rule(rule: str, container_first: bool):
|
|
if "no other bags" in rule:
|
|
return []
|
|
container, contained = rule.split(" bags contain")
|
|
contained = contained.split(", ")
|
|
edges = []
|
|
spec_regex = re.compile(r"^(?P<quantity>\d+) (?P<name>\w+ \w+) bags?\.?$")
|
|
for specification in contained:
|
|
specification = specification.strip()
|
|
match = spec_regex.match(specification)
|
|
assert match, f"Spec '{specification}' must match regex '{spec_regex}'"
|
|
groups = match.groupdict()
|
|
if container_first:
|
|
edges.append((container, groups["name"], int(groups["quantity"])))
|
|
else:
|
|
edges.append((groups["name"], container, int(groups["quantity"])))
|
|
return edges
|
|
|
|
|
|
def solve_part_1(graph: nx.DiGraph):
|
|
res = set()
|
|
to_see = {"shiny gold"}
|
|
while to_see:
|
|
next_node = to_see.pop()
|
|
linked_nodes = set(graph[next_node])
|
|
res.update(linked_nodes)
|
|
to_see.update(linked_nodes)
|
|
return len(res)
|
|
|
|
|
|
def solve_part_2(graph: nx.DiGraph):
|
|
bag_weight = 0
|
|
to_see = [{"name": "shiny gold", "weight": 1}]
|
|
while to_see:
|
|
current_node = to_see.pop()
|
|
linked_nodes = graph[current_node["name"]]
|
|
for node_name, data in linked_nodes.items():
|
|
multiplier = current_node["weight"] * data["weight"]
|
|
bag_weight += multiplier
|
|
to_see.append({"name": node_name, "weight": multiplier})
|
|
return bag_weight
|
|
|
|
|
|
if __name__ == "__main__":
|
|
main("inputs/day07-test1", 4, 32)
|
|
main("inputs/day07-test2", None, 126)
|
|
main("inputs/day07", 378)
|