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UndirectedGraph
- 遍历一遍,判断图分为几部分(假定为P部分,即图有 P 个连通分量),对于每一个连通分量,如果无环则只能是树,即:边数=结点数-1,只要有一个满足边数>结点数-1,原图就有环. -Traverse again, the determination map is divided into several parts (assumed to section P, with P in Figure connected component), for each connected compone