leetcode 133. Clone Graph

class Solution {
public:
	UndirectedGraphNode *cloneGraph(UndirectedGraphNode *node) {
		if (node == NULL)
			return NULL;
		vector<UndirectedGraphNode*>que,nodelist,newnonelist;
		que.push_back(node); nodelist.push_back(node);
		while (!que.empty())
		{
			vector<UndirectedGraphNode*>newque;
			for (int i = 0; i < que.size(); i++)
				for (int j = 0; j < que[i]->neighbors.size(); j++)
				{
					if (find(nodelist.begin(), nodelist.end(), que[i]->neighbors[j]) == nodelist.end())
					{
						nodelist.push_back(que[i]->neighbors[j]);
						newque.push_back(que[i]->neighbors[j]);
					}
				}
			que = newque;
		}
		for (int i = 0; i < nodelist.size(); i++)
		{
			UndirectedGraphNode*n = new UndirectedGraphNode(nodelist[i]->label);
			newnonelist.push_back(n);
		}
		for (int i = 0; i < nodelist.size(); i++)
		{
			newnonelist[i]->neighbors.clear();
			for (int j = 0; j < nodelist[i]->neighbors.size(); j++)
			{
				int index = find(nodelist.begin(), nodelist.end(), nodelist[i]->neighbors[j]) - nodelist.begin();
				newnonelist[i]->neighbors.push_back(newnonelist[index]);
			}
		}
		return newnonelist[0];
	}
};