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36 lines
1,015 B
Go
36 lines
1,015 B
Go
// File: graph_dfs.go
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// Created Time: 2023-02-18
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// Author: Reanon (793584285@qq.com)
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package chapter_graph
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import (
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. "github.com/krahets/hello-algo/pkg"
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)
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/* 深度优先遍历辅助函数 */
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func dfs(g *graphAdjList, visited map[Vertex]struct{}, res *[]Vertex, vet Vertex) {
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// append 操作会返回新的的引用，必须让原引用重新赋值为新slice的引用
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*res = append(*res, vet)
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visited[vet] = struct{}{}
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// 遍历该顶点的所有邻接顶点
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for _, adjVet := range g.adjList[vet] {
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_, isExist := visited[adjVet]
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// 递归访问邻接顶点
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if !isExist {
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dfs(g, visited, res, adjVet)
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}
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}
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}
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/* 深度优先遍历 */
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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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func graphDFS(g *graphAdjList, startVet Vertex) []Vertex {
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// 顶点遍历序列
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res := make([]Vertex, 0)
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// 哈希集合，用于记录已被访问过的顶点
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visited := make(map[Vertex]struct{})
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dfs(g, visited, &res, startVet)
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// 返回顶点遍历序列
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return res
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}
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