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51 lines
1.5 KiB
Python
51 lines
1.5 KiB
Python
import collections
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import math
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def already_seen_on_others(seen, wire, position):
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for key, value in seen.items():
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if key != wire and position in value:
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return value[position]
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return None
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def distance(seen, position, wire_length):
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return int(math.fabs(position[0]) + math.fabs(position[1]))
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def main():
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with open("inputs/day03") as f:
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raw = f.read()
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distances = set()
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seen_positions = collections.defaultdict(dict)
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for wire, line in enumerate(raw.split()):
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x, y = 0, 0
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wire_length = 0
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for segment in line.split(","):
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direction = segment[0]
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length = int(segment[1:])
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for _ in range(length):
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if direction == "R":
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x += 1
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elif direction == "U":
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y += 1
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elif direction == "L":
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x -= 1
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elif direction == "D":
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y -= 1
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else:
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raise ValueError(f"Unknown direction: {direction}")
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wire_length += 1
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position = (x, y)
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if position not in seen_positions[wire]:
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seen_positions[wire][position] = wire_length
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steps = already_seen_on_others(seen_positions, wire, position)
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if steps:
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distances.add(steps + seen_positions[wire][position])
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print(min(distances))
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if __name__ == "__main__":
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main()
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