mirror of
https://github.com/krahets/hello-algo.git
synced 2024-12-25 14:46:28 +08:00
e720aa2d24
* Sync recent changes to the revised Word. * Revised the preface chapter * Revised the introduction chapter * Revised the computation complexity chapter * Revised the chapter data structure * Revised the chapter array and linked list * Revised the chapter stack and queue * Revised the chapter hashing * Revised the chapter tree * Revised the chapter heap * Revised the chapter graph * Revised the chapter searching * Reivised the sorting chapter * Revised the divide and conquer chapter * Revised the chapter backtacking * Revised the DP chapter * Revised the greedy chapter * Revised the appendix chapter * Revised the preface chapter doubly * Revised the figures
59 lines
1.4 KiB
Dart
59 lines
1.4 KiB
Dart
/**
|
||
* File: graph_dfs.dart
|
||
* Created Time: 2023-05-15
|
||
* Author: liuyuxin (gvenusleo@gmail.com)
|
||
*/
|
||
|
||
import '../utils/vertex.dart';
|
||
import 'graph_adjacency_list.dart';
|
||
|
||
/* 深度优先遍历 DFS 辅助函数 */
|
||
void dfs(
|
||
GraphAdjList graph,
|
||
Set<Vertex> visited,
|
||
List<Vertex> res,
|
||
Vertex vet,
|
||
) {
|
||
res.add(vet); // 记录访问顶点
|
||
visited.add(vet); // 标记该顶点已被访问
|
||
// 遍历该顶点的所有邻接顶点
|
||
for (Vertex adjVet in graph.adjList[vet]!) {
|
||
if (visited.contains(adjVet)) {
|
||
continue; // 跳过已被访问的顶点
|
||
}
|
||
// 递归访问邻接顶点
|
||
dfs(graph, visited, res, adjVet);
|
||
}
|
||
}
|
||
|
||
/* 深度优先遍历 DFS */
|
||
List<Vertex> graphDFS(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
|
||
Set<Vertex> visited = {};
|
||
dfs(graph, visited, res, startVet);
|
||
return res;
|
||
}
|
||
|
||
/* Driver Code */
|
||
void main() {
|
||
/* 初始化无向图 */
|
||
List<Vertex> v = Vertex.valsToVets([0, 1, 2, 3, 4, 5, 6]);
|
||
List<List<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 = GraphAdjList(edges);
|
||
print("\n初始化后，图为");
|
||
graph.printAdjList();
|
||
|
||
/* 深度优先遍历 DFS */
|
||
List<Vertex> res = graphDFS(graph, v[0]);
|
||
print("\n深度优先遍历（DFS）顶点序列为");
|
||
print(Vertex.vetsToVals(res));
|
||
}
|