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54 lines
1.5 KiB
JavaScript
54 lines
1.5 KiB
JavaScript
/**
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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('../modules/Vertex');
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const { GraphAdjList } = require('./graph_adjacency_list');
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/* 深度優先走訪 */
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// 使用鄰接表來表示圖，以便獲取指定頂點的所有鄰接頂點
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function dfs(graph, visited, res, vet) {
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res.push(vet); // 記錄訪問頂點
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visited.add(vet); // 標記該頂點已被訪問
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// 走訪該頂點的所有鄰接頂點
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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; // 跳過已被訪問的頂點
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}
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// 遞迴訪問鄰接頂點
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dfs(graph, visited, res, adjVet);
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}
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}
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/* 深度優先走訪 */
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// 使用鄰接表來表示圖，以便獲取指定頂點的所有鄰接頂點
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function graphDFS(graph, startVet) {
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// 頂點走訪序列
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const res = [];
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// 雜湊集合，用於記錄已被訪問過的頂點
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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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/* 初始化無向圖 */
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const v = Vertex.valsToVets([0, 1, 2, 3, 4, 5, 6]);
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const edges = [
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[v[0], v[1]],
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[v[0], v[3]],
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[v[1], v[2]],
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[v[2], v[5]],
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[v[4], v[5]],
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[v[5], v[6]],
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];
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const graph = new GraphAdjList(edges);
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console.log('\n初始化後，圖為');
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graph.print();
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/* 深度優先走訪 */
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const res = graphDFS(graph, v[0]);
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console.log('\n深度優先走訪（DFS）頂點序列為');
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console.log(Vertex.vetsToVals(res));
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