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68 lines
1.6 KiB
Python
68 lines
1.6 KiB
Python
4 years ago
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import math
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data = open('input', 'r').readlines()
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data = [list(x.strip()) for x in data]
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def polarToXY(direction, distance):
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if direction % 2 == 1:
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distance *= math.sqrt(2)
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x = distance * math.cos(direction * math.pi / 4)
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y = distance * math.sin(direction * math.pi / 4)
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return [round(x), round(y)]
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def getTile(mat, x, y):
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if x < 0 or x >= len(mat):
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raise Exception('oob: x')
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if y < 0 or y >= len(mat[x]):
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raise Exception('oob: y')
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return mat[x][y]
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def neighbors(mat, x, y):
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neighbor_list = []
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for direction in range(8):
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try:
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distance = 1
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i, j = polarToXY(direction, distance)
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neighbor = getTile(mat, x + i, y + j)
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while neighbor == '.':
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distance += 1
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i, j = polarToXY(direction, distance)
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neighbor = getTile(mat, x + i, y + j)
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neighbor_list.append(neighbor)
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except:
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pass
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return neighbor_list
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def serialize(mat):
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return '\n'.join([''.join(line) for line in mat])
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def apply(mat):
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newData = []
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for x, _ in enumerate(mat):
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line = []
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for y, _ in enumerate(mat[x]):
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neigh = list(neighbors(mat, x, y))
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if mat[x][y] == 'L' and '#' not in neigh:
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line.append('#')
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elif mat[x][y] == '#' and neigh.count('#') >= 5:
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line.append('L')
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else:
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line.append(mat[x][y])
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newData.append(line)
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return newData
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prev = ''
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while serialize(data) != prev:
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prev = serialize(data)
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data = apply(data)
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print(prev.count('#'))
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