Solution class UnionFind: def __init__(self, grid): m, n = len(grid), len(grid[0]) self.parent = [-1] * (m * n) self.rank = [0] * (m * n) self.count = 0 for i in range(m): for j in range(n): if grid[i][j] == '1': self.parent[i * n + j] = i ...
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