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leetcode - 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 node0
to both nodes1
and2
. - Second node is labeled as
1
. Connect node1
to node2
. - Third node is labeled as
2
. Connect node2
to 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) {}; * }; */ struct UndirectedGraphNode { int label; std::vector<UndirectedGraphNode *> neighbors; UndirectedGraphNode(int x) : label(x) {}; }; class Solution { public: UndirectedGraphNode *cloneGraph(UndirectedGraphNode *node) { std::unordered_map<UndirectedGraphNode*, UndirectedGraphNode *> map; if(node == NULL) return node; return dfs(node,map); } private: UndirectedGraphNode *dfs(UndirectedGraphNode *node,std::unordered_map<UndirectedGraphNode *, UndirectedGraphNode *> &map) { if(map.count(node) > 0) return map[node]; UndirectedGraphNode *newNode = new UndirectedGraphNode(node->label); map[node] = newNode; for(int i = 0; i < node->neighbors.size(); i++) { newNode->neighbors.push_back(dfs(node->neighbors[i],map)); } return newNode; } };
leetcode - Clone Graph
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