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/**
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* File: graph_dfs.js
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* Created Time: 2023-02-21
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* Author: Zhuo Qinyue (1403450829@qq.com)
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*/
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const { Vertex } = require('../include/Vertex');
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const { GraphAdjList } = require('./graph_adjacency_list');
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/* 深度优先遍历 DFS */
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// 使用邻接表来表示图，以便获取指定顶点的所有邻接顶点
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const dfs = (graph, visited, res, vet) => {
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res.push(vet); // 记录访问顶点
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visited.add(vet); // 标记该顶点已被访问
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// 遍历该顶点的所有邻接顶点
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for (const adjVet of graph.adjList.get(vet)) {
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if (visited.has(adjVet)) {
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continue; // 跳过已被访问过的顶点
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}
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// 递归访问邻接顶点
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dfs(graph, visited, res, adjVet);
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}
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}
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/* 深度优先遍历 DFS */
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// 使用邻接表来表示图，以便获取指定顶点的所有邻接顶点
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const graphDFS = (graph, startVet) => {
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// 顶点遍历序列
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const res = [];
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// 哈希表，用于记录已被访问过的顶点
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const visited = new Set();
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dfs(graph, visited, res, startVet);
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return res;
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}
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/* Driver Code */
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/* 初始化无向图 */
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const v = Vertex.valsToVets([0, 1, 2, 3, 4, 5, 6]);
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const edges = [[v[0], v[1]], [v[0], v[3]], [v[1], v[2]],
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[v[2], v[5]], [v[4], v[5]], [v[5], v[6]]];
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const graph = new GraphAdjList(edges);
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console.log("\n初始化后，图为");
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graph.print();
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/* 深度优先遍历 DFS */
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const res = graphDFS(graph, v[0]);
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console.log("\n深度优先遍历（DFS）顶点序列为");
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console.log(Vertex.vetsToVals(res));
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