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本目录作用
GraphTheory 图论 CheckConnectivity 连通性检查
有向图的连通性检查共4种方法
1、dfs 2、bfs 3、并查集 注意：采用并查集判断连通性，是不需要建图的，性能效率要比 dfs和bfs高<span class="ambiguous-code-point tooltip" data-content="， [U+FF0C] is confusable with , [U+002C]"><span class="char">，</span></span>推荐作法。 4、Floyd
