hello-algo/codes/javascript/chapter_graph/graph_dfs.js
zhuoqinyue 2d421de984
feat: add bfs and dfs for JS and TS (#377)
* add bfs and dfs for JS and TS

* update the type

* Apply suggestions from code review

Co-authored-by: Justin Tse <xiefahit@gmail.com>

* Update graph_dfs.ts

* Update graph_bfs.ts

* Update graph_dfs.ts

* Update graph_bfs.ts

* Update graph_dfs.js

* Update graph_bfs.js

---------

Co-authored-by: steak-zhuo <zhuoqinyue@gmail.com>
Co-authored-by: Yudong Jin <krahets@163.com>
Co-authored-by: Justin Tse <xiefahit@gmail.com>
2023-02-25 01:11:11 +08:00

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