mirror of
https://github.com/Crocmagnon/advent-of-code.git
synced 2024-11-24 23:48:13 +01:00
51 lines
1.5 KiB
Python
51 lines
1.5 KiB
Python
import collections
|
|
import math
|
|
|
|
|
|
def already_seen_on_others(seen, wire, position):
|
|
for key, value in seen.items():
|
|
if key != wire and position in value:
|
|
return value[position]
|
|
return None
|
|
|
|
|
|
def distance(seen, position, wire_length):
|
|
return int(math.fabs(position[0]) + math.fabs(position[1]))
|
|
|
|
|
|
def main():
|
|
with open("inputs/day03") as f:
|
|
raw = f.read()
|
|
|
|
distances = set()
|
|
seen_positions = collections.defaultdict(dict)
|
|
for wire, line in enumerate(raw.split()):
|
|
x, y = 0, 0
|
|
wire_length = 0
|
|
for segment in line.split(","):
|
|
direction = segment[0]
|
|
length = int(segment[1:])
|
|
for _ in range(length):
|
|
if direction == "R":
|
|
x += 1
|
|
elif direction == "U":
|
|
y += 1
|
|
elif direction == "L":
|
|
x -= 1
|
|
elif direction == "D":
|
|
y -= 1
|
|
else:
|
|
raise ValueError(f"Unknown direction: {direction}")
|
|
wire_length += 1
|
|
position = (x, y)
|
|
if position not in seen_positions[wire]:
|
|
seen_positions[wire][position] = wire_length
|
|
steps = already_seen_on_others(seen_positions, wire, position)
|
|
if steps:
|
|
distances.add(steps + seen_positions[wire][position])
|
|
|
|
print(min(distances))
|
|
|
|
|
|
if __name__ == "__main__":
|
|
main()
|