POJ 1308 Is It A Tree?（并查集）
2015-02-07 11:50:01

Is It A Tree?Time Limit: 1000MS Memory Limit: 10000KTotal Submissions: 23255 Accepted: 7977Description A tree is a well-known data structure that is either empty (null, void, nothing) or is a set of one or more nodes connected by directed edges between nodes satisfying the following properti ......

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