The tree provides its own, tree-specific interface, and each node is also an STL-compatible Sequence for its child nodes.
该树提供了它自己本身、树专用的接口，而且每个节点都是其子节点的一个STL兼容序列。
User specified nodes as a starting point, the output of each node traversal visit Spanning Tree sequence and the corresponding set of edges.
以用户指定的节点为起点，分别输出每种遍历下的节点访问序列和相应生成树的边集。- one。
User specified nodes as a starting point, the output of each node traversal visit Spanning Tree sequence and the corresponding set of edges.
以用户指定的节点为起点，分别输出每种遍历下的节点访问序列和相应生成树的边集。- one。
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