mirror of
https://github.com/krahets/hello-algo.git
synced 2024-12-25 22:46:28 +08:00
870e3e5cb2
* Sync zh and zh-hant versions * Update en/README.md * Add a Q&A for chapter of introduction * Update the callout headers * Sync zh ang zh-hant versions * Bug fixes
54 lines
1.8 KiB
C#
54 lines
1.8 KiB
C#
/**
|
||
* File: graph_dfs.cs
|
||
* Created Time: 2023-03-08
|
||
* Author: hpstory (hpstory1024@163.com)
|
||
*/
|
||
|
||
namespace hello_algo.chapter_graph;
|
||
|
||
public class graph_dfs {
|
||
/* 深度優先走訪輔助函式 */
|
||
void DFS(GraphAdjList graph, HashSet<Vertex> visited, List<Vertex> res, Vertex vet) {
|
||
res.Add(vet); // 記錄訪問頂點
|
||
visited.Add(vet); // 標記該頂點已被訪問
|
||
// 走訪該頂點的所有鄰接頂點
|
||
foreach (Vertex adjVet in graph.adjList[vet]) {
|
||
if (visited.Contains(adjVet)) {
|
||
continue; // 跳過已被訪問的頂點
|
||
}
|
||
// 遞迴訪問鄰接頂點
|
||
DFS(graph, visited, res, adjVet);
|
||
}
|
||
}
|
||
|
||
/* 深度優先走訪 */
|
||
// 使用鄰接表來表示圖，以便獲取指定頂點的所有鄰接頂點
|
||
List<Vertex> GraphDFS(GraphAdjList graph, Vertex startVet) {
|
||
// 頂點走訪序列
|
||
List<Vertex> res = [];
|
||
// 雜湊集合，用於記錄已被訪問過的頂點
|
||
HashSet<Vertex> visited = [];
|
||
DFS(graph, visited, res, startVet);
|
||
return res;
|
||
}
|
||
|
||
[Test]
|
||
public void Test() {
|
||
/* 初始化無向圖 */
|
||
Vertex[] v = Vertex.ValsToVets([0, 1, 2, 3, 4, 5, 6]);
|
||
Vertex[][] 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]],
|
||
];
|
||
|
||
GraphAdjList graph = new(edges);
|
||
Console.WriteLine("\n初始化後，圖為");
|
||
graph.Print();
|
||
|
||
/* 深度優先走訪 */
|
||
List<Vertex> res = GraphDFS(graph, v[0]);
|
||
Console.WriteLine("\n深度優先走訪（DFS）頂點序列為");
|
||
Console.WriteLine(string.Join(" ", Vertex.VetsToVals(res)));
|
||
}
|
||
}
|