advent-of-code/2023/day5.py
2023-12-05 07:22:56 +01:00

105 lines
2.9 KiB
Python

import sys
from collections import defaultdict
from dataclasses import dataclass
from typing import Literal, TypeAlias
MAP_ORDER = [
"seed",
"soil",
"fertilizer",
"water",
"light",
"temperature",
"humidity",
"location",
]
lines = sys.stdin.read().splitlines()
seeds: list[int] = []
maps: dict[tuple[str, str], list[tuple[int, int, int]]] = {}
# parsing
index = 2
while index < len(lines):
l0 = lines[index]
p1, _, p2 = l0.split("-")
p2 = p2.split()[0].strip()
index += 1
maps[p1, p2] = []
while index < len(lines) and lines[index]:
n1, n2, n3 = lines[index].split()
maps[p1, p2].append((int(n1), int(n2), int(n3)))
index += 1
index += 1
def find_location(seed: int) -> int:
value = seed
for map1, map2 in zip(MAP_ORDER[:-1], MAP_ORDER[1:]):
for target, start, length in maps[map1, map2]:
if value >= start and value < start + length:
value = target + (value - start)
break
return value
def find_range(
values: tuple[int, int], map: list[tuple[int, int, int]]
) -> list[tuple[int, int]]:
r_start, r_length = values
ranges: list[tuple[int, int]] = []
print(r_start, r_length)
for target, start, length in map:
# start is in the range
if start <= r_start and r_start < start + length:
if r_start + r_length < start + length:
ranges.append(
(target + r_start - start, r_length)
)
else:
ranges.append(
(target + r_start - start, length - (r_start - start))
)
elif start < r_start:
if r_start + r_length < start + length:
ranges.append(
(target + r_start - start, target + r_start - start + r_length)
)
elif start >= r_start and r_start >= start
if r_start <= start and start < start + length:
print(start, length, target)
if r_start + r_length < start + length:
ranges.append(
(target + (start - r_start), target + (start - r_start) + length)
)
else:
ranges.append((target + (start - r_start), target + length))
return ranges
# part 1
seeds = [int(s) for s in lines[0].split(":")[1].strip().split()]
answer_1 = min(find_location(seed) for seed in seeds)
print(f"answer 1 is {answer_1}")
# part 2
parts = lines[0].split(":")[1].strip().split()
seeds_p2 = [(int(s), int(e)) for s, e in zip(parts[::2], parts[1::2])]
for seed in range(seeds_p2[0][0], seeds_p2[0][0] + seeds_p2[0][1]):
print(seed, find_location(seed))
print("---")
seeds_p2 = [seeds_p2[0]]
for map1, map2 in zip(MAP_ORDER[:-1], MAP_ORDER[1:]):
seeds_p2 = [s2 for s1 in seeds_p2 for s2 in find_range(s1, maps[map1, map2])]
print(seeds_p2)
answer_2 = ...
print(f"answer 2 is {answer_2}")