35 lines
913 B
Python
35 lines
913 B
Python
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import sys
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S = set() # cubes
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for l in sys.stdin.read().splitlines():
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S.add(tuple(map(int,l.split(','))))
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A = 23
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L = set() # water
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for x in range(-2,A+1):
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for y in range(-2,A+1):
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L.add((x,y,-2))
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more = True
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while more:
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c = 0
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for x in range(-2,A+1):
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for y in range(-2,A+1):
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for z in range(-2,A+1):
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if (x,y,z) not in S and (x,y,z) not in L: # water can only expand in air
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for (i,j,k) in [(0,0,1),(0,0,-1),(0,1,0),(0,-1,0),(1,0,0),(-1,0,0)]:
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if (x+i,y+j,z+k) in L: # if neighbour is water
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L.add((x,y,z)) # water expand
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c += 1
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break
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more = (c>0)
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N = 0
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for (x,y,z) in S:
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for (i,j,k) in [(0,0,1),(0,0,-1),(0,1,0),(0,-1,0),(1,0,0),(-1,0,0)]:
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if (x+i,y+j,z+k) in L:
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N += 1
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print(N)
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# > 2489
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# > 2520
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