2020-04-15 12:28:20 +08:00
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class unionFindSet:
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def __init__(self, S):
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self.S = {i: i for i in S}
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2020-05-13 10:45:51 +08:00
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self.size = {i: 1 for i in S}
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2020-04-15 12:28:20 +08:00
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def find(self, x):
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if x != self.S[x]:
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self.S[x] = self.find(self.S[x])
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return self.S[x]
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def union(self, a, b, key=lambda x: x):
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x, y = sorted((self.find(a), self.find(b)), key=key)
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2020-05-13 10:45:51 +08:00
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self.S[y] = x
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if x != y:
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self.size[x] += self.size[y]
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def getSize(self, x):
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return self.size[self.find(x)]
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