56 lines
No EOL
1.3 KiB
Python
56 lines
No EOL
1.3 KiB
Python
import re
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height = 1000
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width = 1000
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lights = []
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for row in range(height):
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lights.append([])
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for _ in range(width):
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lights[row].append(False)
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pattern = r"^(?P<type>toggle|turn on|turn off) (?P<coord1y>\d+),(?P<coord1x>\d+)[\sA-Za-z]+(?P<coord2y>\d+),(?P<coord2x>\d+)$"
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def light_range(coord1x, coord1y, coord2x, coord2y):
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coord1x = int(coord1x)
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coord1y = int(coord1y)
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coord2x = int(coord2x)
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coord2y = int(coord2y)
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for row in range(coord1y, coord2y + 1):
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for col in range(coord1x, coord2x + 1):
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yield (row, col)
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data = open("input", "r")
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for instruction in data:
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# Parse instruction
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match = re.match(pattern, instruction)
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instruction_type = match.group("type")
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coordinate_generator = light_range(
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match.group("coord1x"), match.group("coord1y"),
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match.group("coord2x"), match.group("coord2y")
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)
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for coord in coordinate_generator:
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if instruction_type == "toggle":
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lights[coord[0]][coord[1]] = not lights[coord[0]][coord[1]]
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elif instruction_type == "turn on":
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lights[coord[0]][coord[1]] = True
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elif instruction_type == "turn off":
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lights[coord[0]][coord[1]] = False
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else:
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raise Exception(f"Input Error: Invalid instruction: \"{instruction_type}\"")
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lights_on = 0
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for row in lights:
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for light in row:
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if light:
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lights_on += 1
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print(f"Total lights on: {lights_on}") |