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83 lines
2.0 KiB
83 lines
2.0 KiB
3 years ago
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import re
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from functools import reduce
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def readInstructions(fileName):
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instructions = []
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with open(fileName) as file:
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lines = file.read().splitlines()
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for line in lines:
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result = re.search(r"x=(.+)\.\.(.+),y=(.+)\.\.(.+),z=(.+)\.\.(.+)", line).groups()
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isOn = line.startswith("on")
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instructions.append((isOn, tuple(int(r) for r in result)))
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return instructions
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def contains(a, b):
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ax1, ax2, ay1, ay2, az1, az2 = a
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bx1, bx2, by1, by2, bz1, bz2 = b
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return ax1 <= bx1 and ax2 >= bx2 and ay1 <= by1 and ay2 >= by2 and az1 <= bz1 and az2 >= bz2
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def volume(cube):
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x1, x2, y1, y2, z1, z2 = cube
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return abs(x2 - x1) * abs(y2 - y1) * abs(z2 - z1)
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def sub(a, b):
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ax1, ax2, ay1, ay2, az1, az2 = a
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bx1, bx2, by1, by2, bz1, bz2 = b
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# if currentCube contains knownCube, remove knownCube
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if contains(b, a):
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return []
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# if there are no intersections, do nothing
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if ax1 > bx2 or ax2 < bx1 or ay1 > by2 or ay2 < by1 or az1 > bz2 or az2 < bz1:
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return [a]
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xSplits = filter(lambda x: ax1 < x < ax2, [bx1, bx2])
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ySplits = filter(lambda y: ay1 < y < ay2, [by1, by2])
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zSplits = filter(lambda z: az1 < z < az2, [bz1, bz2])
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xValues = [ax1, *xSplits, ax2]
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yValues = [ay1, *ySplits, ay2]
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zValues = [az1, *zSplits, az2]
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results = []
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for i in range(len(xValues) - 1):
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for j in range(len(yValues) - 1):
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for k in range(len(zValues) - 1):
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newC = xValues[i], yValues[j], zValues[k], xValues[i + 1], yValues[j + 1], zValues[k + 1]
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if not contains(b, newC):
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results.append(newC)
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return results
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def flatMap(func, elements):
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return [j for i in elements for j in func(i)]
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def reboot():
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instructions = readInstructions("input")
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cubes = []
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for turnOn, coords in instructions:
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x1, x2, y1, y2, z1, z2 = coords
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currentCube = x1, x2 + 1, y1, y2 + 1, z1, z2 + 1
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cubes = flatMap(lambda c: sub(c, currentCube), cubes)
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# add to set if 'on'
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if turnOn:
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cubes.append(currentCube)
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onCount = sum(map(volume, cubes))
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print(onCount)
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reboot()
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# on x=-54112..-39298,y=-85059..-49293,z=-27449..7877
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# on x=967..23432,y=45373..81175,z=27513..53682
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