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Day 5: Print Queue #43

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Dec 5, 2024
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2 changes: 1 addition & 1 deletion README.md
Original file line number Diff line number Diff line change
Expand Up @@ -9,4 +9,4 @@ Development occurs in language-specific directories:
|[Day2.hs](hs/src/Day2.hs)|[Day2.kt](kt/aoc2024-lib/src/commonMain/kotlin/com/github/ephemient/aoc2024/Day2.kt)|[day2.py](py/aoc2024/day2.py)|[day2.rs](rs/src/day2.rs)|
|[Day3.hs](hs/src/Day3.hs)|[Day3.kt](kt/aoc2024-lib/src/commonMain/kotlin/com/github/ephemient/aoc2024/Day3.kt)|[day3.py](py/aoc2024/day3.py)|[day3.rs](rs/src/day3.rs)|
|[Day4.hs](hs/src/Day4.hs)|[Day4.kt](kt/aoc2024-lib/src/commonMain/kotlin/com/github/ephemient/aoc2024/Day4.kt)|[day4.py](py/aoc2024/day4.py)|[day4.rs](rs/src/day4.rs)|
|[Day5.hs](hs/src/Day5.hs)|[Day5.kt](kt/aoc2024-lib/src/commonMain/kotlin/com/github/ephemient/aoc2024/Day5.kt)|||
|[Day5.hs](hs/src/Day5.hs)|[Day5.kt](kt/aoc2024-lib/src/commonMain/kotlin/com/github/ephemient/aoc2024/Day5.kt)|[day5.py](py/aoc2024/day5.py)||
94 changes: 94 additions & 0 deletions py/aoc2024/day5.py
Original file line number Diff line number Diff line change
@@ -0,0 +1,94 @@
"""
Day 5: Print Queue
"""

from typing import Callable, Iterable, List, Set, Tuple

SAMPLE_INPUT = """
47|53
97|13
97|61
97|47
75|29
61|13
75|53
29|13
97|29
53|29
61|53
97|53
61|29
47|13
75|47
97|75
47|61
75|61
47|29
75|13
53|13

75,47,61,53,29
97,61,53,29,13
75,29,13
75,97,47,61,53
61,13,29
97,13,75,29,47
"""


def _parse(data: str) -> Tuple[Set[Tuple[int, int]], List[List[int]]]:
(deps, updates) = data.split("\n\n")
deps = {
tuple(int(page) for page in line.split("|"))
for line in deps.splitlines()
if line
}
updates = [
[int(page) for page in line.split(",")] for line in updates.splitlines() if line
]
return deps, updates


def part1(data: str) -> int:
"""
>>> part1(SAMPLE_INPUT)
143
"""
deps, updates = _parse(data)
return sum(
pages[len(pages) // 2]
for pages in updates
if all((y, x) not in deps for i, x in enumerate(pages) for y in pages[i + 1 :])
)


def part2(data: str) -> int:
"""
>>> part2(SAMPLE_INPUT)
123
"""
deps, updates = _parse(data)
return sum(
sorted_pages[len(pages) // 2]
for pages in updates
if pages
!= (sorted_pages := _partial_sorted(pages, lambda x, y: (y, x) not in deps))
)


def _partial_sorted[T](iterable: Iterable[T], ok: Callable[[T, T], bool]) -> List[T]:
output = list(iterable)
i = 0
while i < len(output):
x = output[i]
for j in range(i + 1, len(output)):
y = output[j]
if not ok(x, y):
output[i], output[j] = y, x
break
else:
i += 1
return output


parts = (part1, part2)
1 change: 1 addition & 0 deletions py/pyproject.toml
Original file line number Diff line number Diff line change
Expand Up @@ -28,6 +28,7 @@ day1 = "aoc2024.day1:parts"
day2 = "aoc2024.day2:parts"
day3 = "aoc2024.day3:parts"
day4 = "aoc2024.day4:parts"
day5 = "aoc2024.day5:parts"

[build-system]
requires = ["poetry-core"]
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