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Clone Graph
Clone an undirected graph. Each node in the graph contains a label and a list of its neighbors.
OJ‘s undirected graph serialization:
Nodes are labeled uniquely.
We use# as a separator for each node, and , as a separator for node label and each neighbor of the node.
As an example, consider the serialized graph {0,1,2#1,2#2,2}.
The graph has a total of three nodes, and therefore contains three parts as separated by #.
- First node is labeled as
0. Connect node0to both nodes1and2. - Second node is labeled as
1. Connect node1to node2. - Third node is labeled as
2. Connect node2to node2(itself), thus forming a self-cycle.
Visually, the graph looks like the following:
1 / / 0 --- 2 / \_/
/** * Definition for undirected graph. * struct UndirectedGraphNode { * int label; * vector<UndirectedGraphNode *> neighbors; * UndirectedGraphNode(int x) : label(x) {}; * }; */class Solution {public: void cloneGraph_core(UndirectedGraphNode *node, UndirectedGraphNode* &res, unordered_map<UndirectedGraphNode*, UndirectedGraphNode*>& originToCopy) { if(originToCopy[node]) res = originToCopy[node]; else { res = new UndirectedGraphNode(node->label); originToCopy[node] = res; } int len = node->neighbors.size(); if(res->neighbors.empty()) for(int i = 0; i < len; i++) { res->neighbors.push_back(0); cloneGraph_core(node->neighbors[i], res->neighbors.back(), originToCopy); } } UndirectedGraphNode *cloneGraph(UndirectedGraphNode *node) { if(!node) return 0; unordered_map<UndirectedGraphNode*, UndirectedGraphNode*> originToCopy; UndirectedGraphNode *res; cloneGraph_core(node, res, originToCopy); return res; }};
Clone Graph
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