Given a boolean 2D matrix, find the number of islands. A group of connected 1s forms an island. The idea is to consider all 1 values as individual sets. Traverse the matrix and do a union of all...感觉bfs就很方便，为什么还要用union find，有什么优点吗？ 节省时间，空间？ 没看出来. 有的题dfs不行，必须bfs。uf对特殊问题效率高（比如island 2里cell不断地增加)，uf只需对付新增的部...
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