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AoC 2020: day24, refactored for performance

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Signed-off-by: Ettore Dreucci <ettore.dreucci@gmail.com>
This commit is contained in:
Ettore Dreucci
2020-12-24 19:31:20 +01:00
parent 83f73e4439
commit 05eb9da3d7
2 changed files with 22 additions and 7 deletions
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27
2020-python/solutions/day_24.py
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@@ -2,6 +2,7 @@
import pathlib
import time
import cProfile
import re
import operator
import itertools
@@ -70,16 +71,30 @@ def find_dst_tile(steps: list) -> tuple:
def count_black_neighbors(tiles: set, x_tile: int, y_tile: int) -> int:
"""return the number of black adjacent tile of a given one"""
return sum((x_tile+d_x, y_tile+d_y) in tiles for d_x, d_y in STEPMAP.values())
black_neighbors = 0
for d_x, d_y in STEPMAP.values():
if (x_tile+d_x, y_tile+d_y) in tiles:
black_neighbors += 1
return black_neighbors
def calculate_floor_bounds(tiles: set) -> tuple:
"""return the floor boundaries"""
min_x = min(map(operator.itemgetter(0), tiles)) - 1
min_y = min(map(operator.itemgetter(1), tiles)) - 1
max_x = max(map(operator.itemgetter(0), tiles)) + 2
max_y = max(map(operator.itemgetter(1), tiles)) + 2
min_x = float('Inf')
max_x = float('-Inf')
min_y = float('Inf')
max_y = float('-Inf')
return range(min_x, max_x), range(min_y, max_y)
for x_tile, y_tile in tiles:
if x_tile < min_x:
min_x = x_tile
elif x_tile > max_x:
max_x = x_tile
if y_tile < min_y:
min_y = y_tile
elif y_tile > max_y:
max_y = y_tile
return range(min_x-1, max_x+2), range(min_y-1, max_y+2)
def flip_tiles(tiles: set) -> set:
"""calculate the new daily floor"""

2
README.md
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@@ -33,4 +33,4 @@
| [Day 21](https://adventofcode.com/2020/day/21) | [2.177ms](./2020-python/solutions/day_21.py) | [1.578ms](./2020-python/solutions/day_21.py) |
| [Day 22](https://adventofcode.com/2020/day/22) | [1.516s](./2020-python/solutions/day_22.py) | [1.353s](./2020-python/solutions/day_22.py) |
| [Day 23](https://adventofcode.com/2020/day/23) | [14.754s](./2020-python/solutions/day_23.py) | [3.572s](./2020-python/solutions/day_23.py) |
| [Day 24](https://adventofcode.com/2020/day/24) | [1.097s](./2020-python/solutions/day_24.py) | [457.262ms](./2020-python/solutions/day_24.py) |
| [Day 24](https://adventofcode.com/2020/day/24) | [753.985ms](./2020-python/solutions/day_24.py) | [357.455ms](./2020-python/solutions/day_24.py) |