题目挺长的，其实只需要关注第一行就OK了。这道题思路挺明显的，对于图来说要么BFS，要么DFS，至于具体细节，我觉得与138题：Copy List with Random Pointer很像。在BFS或DFS过程中，可能要调整顶点的邻接点，这个时候不要忘了它的邻接点可能还没有创建。所以，有以下思路：
遍历两遍无向图。第一遍，创建所有结点，不用保存顶点间关系。第二遍，调整顶点间关系。顶点间关系保存在neighbors中，为了能够找到新创建顶点的位置，第一遍遍历时候需要保存原顶点与新顶点指针的一一对应关系，这里可用map或unordered_map保存。
这里我说的有点啰嗦，请看代码中注释就明白了。这里，我采用BFS遍历。时间复杂度为O(N)，空间复杂度也为O(N)。
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