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