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#!/usr/bin/env python3
from functools import reduce
from operator import mul
def not_reduced(label_dict: dict[int, str]) -> bool:
return any(len(label_dict[i]) != 1 for i in label_dict)
def main() -> None:
with open("input", "r", encoding="utf-8") as f:
data = f.readlines()
i = 0
valid: list[int] = []
labels: list[str] = []
while data[i] != "\n":
labels.append(data[i].split(":")[0])
ranges = data[i].split(": ")[1].split(" or ")
for _range in ranges:
bounds = tuple(map(int, _range.split("-")))
valid.extend(range(bounds[0], bounds[1] + 1))
for j in range(bounds[0], bounds[1] + 1):
valid.append(j)
i += 1
# Skip to nearby tickets
i += 5
vtickets: list[tuple[int, ...]] = []
for j in range(i, len(data)):
fields = tuple(map(int, data[j].split(",")))
if all(field in valid for field in fields) == True:
vtickets.append(fields)
label_dict: dict[int, list[str]] = {i: [] for i in range(len(labels))}
for label in labels:
valid: list[list[int]] = []
ranges = data[labels.index(label)].split(": ")[1].split(" or ")
for _range in ranges:
bounds = tuple(map(int, _range.split("-")))
valid.extend(range(bounds[0], bounds[1] + 1))
# For each column
for i in range(len(labels)):
if all(ticket[i] in valid for ticket in vtickets):
label_dict[i].append(label)
# Reduce the label dictionary
while not_reduced(label_dict):
for i in label_dict:
if len((l := label_dict[i])) == 1:
for j in label_dict:
if l[0] in label_dict[j] and i != j:
label_dict[j].remove(l[0])
my_ticket = tuple(map(int, data[data.index("your ticket:\n") + 1].split(",")))
print(reduce(mul, [x for x in my_ticket if "departure" in label_dict[my_ticket.index(x)][0]],))
if __name__ == "__main__":
main()
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