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compare: public:a887c3f6fd4eb865fe978cf72235d75b9d76f845
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Author SHA1 Message Date
Stefan Harmuth
a887c3f6fd Merge remote-tracking branch 'origin/main' 2023-12-14 10:35:01 +01:00
Stefan Harmuth
3fb3394dfb Day 14 2023-12-14 09:52:34 +01:00
3 changed files with 184 additions and 0 deletions
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74
day14.py Normal file
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from tools.aoc import AOCDay
from tools.coordinate import Coordinate
from tools.grid import Grid
from typing import Any
def load_after_roll(platform: Grid, direction: Coordinate) -> int:
load = 0
sort_order = {
Coordinate(0, -1): sorted(platform.getActiveCells(), key=lambda c: c.y),
Coordinate(-1, 0): sorted(platform.getActiveCells()),
Coordinate(0, 1): sorted(platform.getActiveCells(), key=lambda c: -c.y),
Coordinate(1, 0): sorted(platform.getActiveCells(), key=lambda c: -c.x),
}
for c in sort_order[direction]:
if platform.get(c) == "#":
continue
t = c
while not platform.get(t + direction) and platform.isWithinBoundaries(t + direction):
t += direction
platform.set(c, False)
platform.set(t, "O")
load += platform.maxY - t[1] + 1
return load
class Day(AOCDay):
inputs = [
[
(136, "input14_test"),
(110407, "input14"),
],
[
(64, "input14_test"),
(87273, "input14"),
],
]
def part1(self) -> Any:
platform = Grid.from_data(self.getInput(), translate={".": False})
return load_after_roll(platform, Coordinate(0, -1))
def part2(self) -> Any:
platform = Grid.from_data(self.getInput(), translate={".": False})
DP = {}
cycle_loads = {}
directions = [Coordinate(0, -1), Coordinate(-1, 0), Coordinate(0, 1), Coordinate(1, 0)]
max_cycles = 1_000_000_000
cycle = 0
while cycle < max_cycles:
cycle += 1
load = 0
for d in directions:
load = load_after_roll(platform, d)
cycle_loads[cycle] = load
fingerprint = tuple(sorted(platform.getActiveCells()))
if (load, fingerprint) in DP:
repeat_start = DP[(load, fingerprint)]
lookup_cycle = (max_cycles - repeat_start) % (cycle - repeat_start) + repeat_start
return cycle_loads[lookup_cycle]
else:
DP[(load, fingerprint)] = cycle
return ""
if __name__ == "__main__":
day = Day(2023, 14)
day.run(verbose=True)

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