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42 lines
1.1 KiB
42 lines
1.1 KiB
// File: graph_bfs.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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/* 广度优先遍历 */
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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 graphBFS(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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visited[startVet] = struct{}{}
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// 队列用于实现 BFS, 使用切片模拟队列
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queue := make([]Vertex, 0)
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queue = append(queue, startVet)
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// 以顶点 vet 为起点，循环直至访问完所有顶点
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for len(queue) > 0 {
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// 队首顶点出队
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vet := queue[0]
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queue = queue[1:]
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// 记录访问顶点
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res = append(res, vet)
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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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// 只入队未访问的顶点
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if !isExist {
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queue = append(queue, adjVet)
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visited[adjVet] = struct{}{}
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}
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}
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}
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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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