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hello-algo/ja/codes/csharp/chapter_graph/graph_dfs.cs
Yudong Jin 7257641e0e Retranslate the complete Japanese online edition from Chinese (#2008)
* Retranslate the complete Japanese online edition from Chinese

* Fit Japanese homepage labels and localize heading permalinks

* Point Japanese contribution instructions to the Japanese preview

* Replace locale conditionals with multilingual UI tables
2026-10-30 02:12:26 +08:00

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/**
* File: graph_dfs.cs
* Created Time: 2023-03-08
* Author: hpstory (hpstory1024@163.com)
*/
namespace hello_algo.chapter_graph;
public class graph_dfs {
/* 深さ優先走査の補助関数 */
void DFS(GraphAdjList graph, HashSet<Vertex> visited, List<Vertex> res, Vertex vet) {
res.Add(vet); // 訪問した頂点を記録する
visited.Add(vet); // この頂点を訪問済みにする
// この頂点に隣接する全頂点を走査する
foreach (Vertex adjVet in graph.adjList[vet]) {
if (visited.Contains(adjVet)) {
continue; // 訪問済みの頂点をスキップする
}
// 隣接する頂点を再帰的に訪問する
DFS(graph, visited, res, adjVet);
}
}
/* 深さ優先走査 */
// 指定した頂点に隣接する全頂点を取得しやすいように、グラフを隣接リストで表す
List<Vertex> GraphDFS(GraphAdjList graph, Vertex startVet) {
// 頂点の走査順序
List<Vertex> res = [];
// 訪問済みの頂点を記録するハッシュ集合
HashSet<Vertex> visited = [];
DFS(graph, visited, res, startVet);
return res;
}
[Test]
public void Test() {
/* 無向グラフを初期化する */
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初期化後のグラフ");
graph.Print();
/* 深さ優先走査 */
List<Vertex> res = GraphDFS(graph, v[0]);
Console.WriteLine("\n深さ優先走査(DFS)の頂点の順序");
Console.WriteLine(string.Join(" ", Vertex.VetsToVals(res)));
}
}