47 lines
1.0 KiB
Python
47 lines
1.0 KiB
Python
#!/usr/bin/env python
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density = []
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distance = []
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def shortes_path(density, distance):
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queue = []
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queue.append((0,0))
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#import pdb; pdb.set_trace()
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while(len(queue)):
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pos = queue.pop(0)
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v = distance[pos[1]][pos[0]]
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for move in ((0,1), (0,-1), (1,0), (-1,0)):
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move_x = move[0] + pos[0]
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move_y = move[1] + pos[1]
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if (move_x) < 0:
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continue
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if (move_y) < 0:
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continue
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if (move_y) >= len(density):
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continue
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if (move_x) >= len(density[move_y]):
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continue
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if distance[move_y][move_x] is None:
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distance[move_y][move_x] = v + density[move_y][move_x]
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queue.append((move_x, move_y))
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continue
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if density[move_y][move_x] + v < distance[move_y][move_x]:
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distance[move_y][move_x] = v + density[move_y][move_x]
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queue.append((move_x, move_y))
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continue
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with open("input01.txt","r") as f:
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for line in f:
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density.append([int(i) for i in line.strip()])
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distance.append([None]*len(line.strip()))
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distance[0][0] = density[0][0]
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shortes_path(density,distance)
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print(distance[-1][-1]-distance[0][0])
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