81 lines
1.7 KiB
Python
81 lines
1.7 KiB
Python
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with open('day13-input', 'r') as file:
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data = [l.strip('\n') for l in file]
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import numpy as np
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grid = np.zeros((len(data[0]), len(data)), dtype=np.int64)
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minecarts = []
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codes = {
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' ': 0,
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'-': 1,
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'|': 2,
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'+': 3,
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'/': 4,
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'\\': 5,
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}
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carts = {
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'>': (0, 1),
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'v': (1, 2),
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'<': (2, 1),
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'^': (3, 2),
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}
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directions = np.array([[1,0], [0,1], [-1,0], [0,-1]])
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turns = [-1, 0, 1]
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for y, line in enumerate(data):
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for x, char in enumerate(line):
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if char in codes:
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grid[x,y] = codes[char]
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else:
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grid[x,y] = carts[char][1]
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minecarts.append([x, y, carts[char][0], 0])
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while len(minecarts) > 1:
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minecarts = sorted(minecarts, key=lambda c: c[1]*200+c[0])
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i = 0
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while i < len(minecarts):
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mc = minecarts[i]
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next_index = list(mc[0:2]+directions[mc[2]])
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g = grid[tuple(next_index)]
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mc[0:2] = next_index
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if g == 1 or g == 2:
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pass
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elif g == 4:
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if mc[2] == 0:
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mc[2] = 3
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elif mc[2] == 1:
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mc[2] = 2
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elif mc[2] == 2:
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mc[2] = 1
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elif mc[2] == 3:
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mc[2] = 0
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elif g == 5:
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if mc[2] == 0:
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mc[2] = 1
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elif mc[2] == 1:
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mc[2] = 0
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elif mc[2] == 2:
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mc[2] = 3
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elif mc[2] == 3:
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mc[2] = 2
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elif g == 3:
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mc[2] = (mc[2]+turns[mc[3]])%4
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mc[3] = (mc[3]+1) % 3
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for j, mc2 in enumerate(minecarts):
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if mc2 == mc:
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continue
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if np.array_equal(mc[0:2], mc2[0:2]):
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print('Crash at', mc[0:2])
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if j > i:
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minecarts.pop(j)
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minecarts.pop(i)
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i -= 1
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else:
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minecarts.pop(i)
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minecarts.pop(j)
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i -= 2
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break
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i += 1
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print('Last cart', minecarts[0])
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