mirror of
https://github.com/krahets/hello-algo.git
synced 2024-12-26 22:56:28 +08:00
56b20eff36
* .net 8.0 migration * update docs * revert change * revert change and update appendix docs * remove static * Update binary_search_insertion.cs * Update binary_search_insertion.cs * Update binary_search_edge.cs * Update binary_search_insertion.cs * Update binary_search_edge.cs --------- Co-authored-by: Yudong Jin <krahets@163.com>
58 lines
2 KiB
C#
58 lines
2 KiB
C#
/**
|
||
* File: graph_bfs.cs
|
||
* Created Time: 2023-03-08
|
||
* Author: hpstory (hpstory1024@163.com)
|
||
*/
|
||
|
||
namespace hello_algo.chapter_graph;
|
||
|
||
public class graph_bfs {
|
||
/* 广度优先遍历 BFS */
|
||
// 使用邻接表来表示图，以便获取指定顶点的所有邻接顶点
|
||
List<Vertex> GraphBFS(GraphAdjList graph, Vertex startVet) {
|
||
// 顶点遍历序列
|
||
List<Vertex> res = [];
|
||
// 哈希表，用于记录已被访问过的顶点
|
||
HashSet<Vertex> visited = [startVet];
|
||
// 队列用于实现 BFS
|
||
Queue<Vertex> que = new();
|
||
que.Enqueue(startVet);
|
||
// 以顶点 vet 为起点，循环直至访问完所有顶点
|
||
while (que.Count > 0) {
|
||
Vertex vet = que.Dequeue(); // 队首顶点出队
|
||
res.Add(vet); // 记录访问顶点
|
||
foreach (Vertex adjVet in graph.adjList[vet]) {
|
||
if (visited.Contains(adjVet)) {
|
||
continue; // 跳过已被访问过的顶点
|
||
}
|
||
que.Enqueue(adjVet); // 只入队未访问的顶点
|
||
visited.Add(adjVet); // 标记该顶点已被访问
|
||
}
|
||
}
|
||
|
||
// 返回顶点遍历序列
|
||
return res;
|
||
}
|
||
|
||
[Test]
|
||
public void Test() {
|
||
/* 初始化无向图 */
|
||
Vertex[] v = Vertex.ValsToVets([0, 1, 2, 3, 4, 5, 6, 7, 8, 9]);
|
||
Vertex[][] edges =
|
||
[
|
||
[v[0], v[1]], [v[0], v[3]], [v[1], v[2]],
|
||
[v[1], v[4]], [v[2], v[5]], [v[3], v[4]],
|
||
[v[3], v[6]], [v[4], v[5]], [v[4], v[7]],
|
||
[v[5], v[8]], [v[6], v[7]], [v[7], v[8]]
|
||
];
|
||
|
||
GraphAdjList graph = new(edges);
|
||
Console.WriteLine("\n初始化后，图为");
|
||
graph.Print();
|
||
|
||
/* 广度优先遍历 BFS */
|
||
List<Vertex> res = GraphBFS(graph, v[0]);
|
||
Console.WriteLine("\n广度优先遍历（BFS）顶点序列为");
|
||
Console.WriteLine(string.Join(" ", Vertex.VetsToVals(res)));
|
||
}
|
||
}
|