无向图的节点定义如下：

import Tabs from "@theme/Tabs"; import TabItem from "@theme/TabItem";

<Tabs defaultValue="java" values={[ { label: 'Java', value: 'java', }, { label: 'C++', value: 'cpp', }, ] }>

// 无向图的节点
class UndirectedGraphNode {
    int label;
    ArrayList<UndirectedGraphNode> neighbors;
    UndirectedGraphNode(int x) { label = x;}
};

// 无向图的节点
struct UndirectedGraphNode {
    int label;
    vector<UndirectedGraphNode *> neighbors;
    UndirectedGraphNode(int x) : label(x) {};
};