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February 4, 2016 04:28
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| class UnionFind: | |
| def __init__(self, N): | |
| self.rank = [0]*N | |
| self.par = list(range(N)) | |
| def find(self, x): | |
| if x != self.par[x]: | |
| self.par[x] = self.find(self.par[x]) | |
| return self.par[x] | |
| def unite(self, x, y): | |
| x, y = self.find(x), self.find(y) | |
| if(self.rank[x] > self.rank[y]): | |
| self.par[y] = x | |
| else: | |
| self.par[x] = y | |
| if(self.rank[x] == self.rank[y]): | |
| self.rank[y] += 1 |
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