45 lines
1.3 KiB
Python
45 lines
1.3 KiB
Python
input = open("input", 'r')
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# d = [line for line in input]
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# d = [[val for val in line.strip()] for line in input]
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d = {(complex(x,y)): c for y,line in enumerate(input) for x,c in enumerate(line.strip())}
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def run(p2=False):
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regionPrice = []
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s = set()
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for point, plot in d.items():
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if point in s: continue
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q = [point]
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area = 0
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sides = set()
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while q:
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point = q.pop()
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if point in s: continue
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s.add(point)
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area += 1
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for dr in {1,-1,1j,-1j}:
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npoint = point + dr
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if npoint in d and d[npoint] == plot:
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q.append(npoint)
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else:
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sides.add((dr, point))
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if p2:
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nsides = sides.copy()
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for side in sides:
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if side not in nsides:
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continue
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sdr, spoint = side
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for dr in {1,-1,1j,-1j} - {sdr, -sdr}:
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point = spoint + dr
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while (sdr, point) in nsides:
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nsides.discard((sdr,point))
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point = point + dr
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sides = nsides
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regionPrice.append(len(sides) * area)
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return sum(regionPrice)
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print(run())
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print(run(True))
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