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AoC 2020: day12

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Signed-off-by: Ettore Dreucci <ettore.dreucci@gmail.com>
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Ettore Dreucci
2020-12-12 12:13:21 +01:00
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"""AOC 2020 Day 12"""
import pathlib
import time
TEST_INPUT = """F10
N3
F7
R90
F11"""
LEFT, RIGHT = 'L', 'R'
FORWARD = 'F'
NORTH, SOUTH, EAST, WEST = 'N', 'S', 'E', 'W'
def read_input(input_path: str) -> str:
"""take input file path and return a str with the file's content"""
with open(input_path, 'r') as input_file:
input_data = input_file.read().strip()
return input_data
def extract(input_data: str) -> list:
"""take input data and return the appropriate data structure"""
entries = []
for line in input_data.split('\n'):
instruction = (line[0], int(line[1:]))
entries.append(instruction)
return entries
def rotate_ship(direction: str, rotation: str) -> str:
"""rotate the ship"""
if direction == NORTH:
return WEST if rotation == LEFT else EAST
if direction == SOUTH:
return EAST if rotation == LEFT else WEST
if direction == EAST:
return NORTH if rotation == LEFT else SOUTH
if direction == WEST:
return SOUTH if rotation == LEFT else NORTH
return None
def move(direction: str, x: int, y: int, value: int) -> tuple:
"""move the ship or the waypoint"""
if direction == NORTH:
return (x, y+value)
if direction == SOUTH:
return (x, y-value)
if direction == EAST:
return (x+value, y)
if direction == WEST:
return (x-value, y)
return None
def rotate_waypoint(direction: str, x: int, y: int, value: int) -> tuple:
"""rotate waypoint around ship"""
if (direction == LEFT and value == 90) or (direction == RIGHT and value == 270):
return (-y, x)
if ((direction == LEFT and value == 180) or (direction == RIGHT and value == 180)):
return (-x, -y)
if ((direction == LEFT and value == 270) or (direction == RIGHT and value == 90)):
return (y, -x)
return None
def part1(entries: list) -> int:
"""part1 solver"""
direction = EAST
x_ship, y_ship = 0, 0
for action, value in entries:
if action == FORWARD:
x_ship, y_ship = move(direction, x_ship, y_ship, value)
elif action in (LEFT, RIGHT):
for _ in range(value//90):
direction = rotate_ship(direction, action)
else:
x_ship, y_ship = move(action, x_ship, y_ship, value)
return abs(x_ship) + abs(y_ship)
def part2(entries: list) -> int:
"""part2 solver"""
x_ship, y_ship = 0, 0
x_wp, y_wp = 10, 1
for action, value in entries:
if action == FORWARD:
x_ship += x_wp * value
y_ship += y_wp * value
elif action in (LEFT, RIGHT):
x_wp, y_wp = rotate_waypoint(action, x_wp, y_wp, value)
else:
x_wp, y_wp = move(action, x_wp, y_wp, value)
return abs(x_ship) + abs(y_ship)
def test_input_day_12():
"""pytest testing function"""
entries = extract(TEST_INPUT)
assert part1(entries) == 25
assert part2(entries) == 286
def test_bench_day_12(benchmark):
"""pytest-benchmark function"""
benchmark(main)
def main():
"""main function"""
input_path = str(pathlib.Path(__file__).resolve().parent.parent) + "/inputs/" + str(pathlib.Path(__file__).stem)
start_time = time.time()
input_data = read_input(input_path)
entries = extract(input_data)
print("Part 1: %d" % part1(entries))
print("Part 2: %d" % part2(entries))
end_time = time.time()
print("Execution time: %f" % (end_time-start_time))
if __name__ == "__main__":
main()

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| [Day 5](https://adventofcode.com/2020/day/5) | [5.993ms](./2020-python/solutions/day_05.py) | [---](./2020-python/solutions/day_05.py) | | [Day 5](https://adventofcode.com/2020/day/5) | [5.993ms](./2020-python/solutions/day_05.py) | [---](./2020-python/solutions/day_05.py) |
| [Day 6](https://adventofcode.com/2020/day/6) | [2.587ms](./2020-python/solutions/day_06.py) | [2.275ms](./2020-python/solutions/day_06.py) | | [Day 6](https://adventofcode.com/2020/day/6) | [2.587ms](./2020-python/solutions/day_06.py) | [2.275ms](./2020-python/solutions/day_06.py) |
| [Day 7](https://adventofcode.com/2020/day/7) | [1.689ms](./2020-python/solutions/day_07.py) | [1.565ms](./2020-python/solutions/day_07.py) | | [Day 7](https://adventofcode.com/2020/day/7) | [1.689ms](./2020-python/solutions/day_07.py) | [1.565ms](./2020-python/solutions/day_07.py) |
| [Day 8](https://adventofcode.com/2020/day/8) | [6.313ms](./2020-python/solutions/day_08.py) | [794.417us](./2020-python/solutions/day_08.py) | | [Day 8](https://adventofcode.com/2020/day/8) | [6.313ms](./2020-python/solutions/day_08.py) | [794.417µs](./2020-python/solutions/day_08.py) |
| [Day 9](https://adventofcode.com/2020/day/9) | [7.220ms](./2020-python/solutions/day_09.py) | [4.783ms](./2020-python/solutions/day_09.py) | | [Day 9](https://adventofcode.com/2020/day/9) | [7.220ms](./2020-python/solutions/day_09.py) | [4.783ms](./2020-python/solutions/day_09.py) |
| [Day 10](https://adventofcode.com/2020/day/10) | [139.110us](./2020-python/solutions/day_10.py) | [98.594us](./2020-python/solutions/day_10.py) | | [Day 10](https://adventofcode.com/2020/day/10) | [139.110us](./2020-python/solutions/day_10.py) | [98.594µs](./2020-python/solutions/day_10.py) |
| [Day 11](https://adventofcode.com/2020/day/11) | [2.879s](./2020-python/solutions/day_11.py) | [419.447ms](./2020-python/solutions/day_11.py) | | [Day 11](https://adventofcode.com/2020/day/11) | [2.879s](./2020-python/solutions/day_11.py) | [419.447ms](./2020-python/solutions/day_11.py) |
| [Day 12](https://adventofcode.com/2020/day/12) | [746.181µs](./2020-python/solutions/day_12.py) | [211.216µs](./2020-python/solutions/day_12.py) |