mirror of
https://github.com/krahets/hello-algo.git
synced 2024-12-28 06:46:28 +08:00
55 lines
1.7 KiB
C++
55 lines
1.7 KiB
C++
/**
|
||
* File: graph_dfs.cpp
|
||
* Created Time: 2023-03-02
|
||
* Author: Krahets (krahets@163.com)
|
||
*/
|
||
|
||
#include "../include/include.hpp"
|
||
#include "./graph_adjacency_list.cpp"
|
||
|
||
/* 深度优先遍历 DFS 辅助函数 */
|
||
void dfs(GraphAdjList& graph, unordered_set<Vertex*>& visited, vector<Vertex*>& res, Vertex* vet) {
|
||
res.push_back(vet); // 记录访问顶点
|
||
visited.emplace(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 : graph.adjList[vet]) {
|
||
if (visited.count(adjVet))
|
||
continue; // 跳过已被访问过的顶点
|
||
// 递归访问邻接顶点
|
||
dfs(graph, visited, res, adjVet);
|
||
}
|
||
}
|
||
|
||
/* 深度优先遍历 DFS */
|
||
// 使用邻接表来表示图，以便获取指定顶点的所有邻接顶点
|
||
vector<Vertex*> graphDFS(GraphAdjList& graph, Vertex* startVet) {
|
||
// 顶点遍历序列
|
||
vector<Vertex*> res;
|
||
// 哈希表，用于记录已被访问过的顶点
|
||
unordered_set<Vertex*> visited;
|
||
dfs(graph, visited, res, startVet);
|
||
return res;
|
||
}
|
||
|
||
/* Driver Code */
|
||
int main() {
|
||
/* 初始化无向图 */
|
||
vector<Vertex*> v = valsToVets(vector<int> { 0, 1, 2, 3, 4, 5, 6 });
|
||
vector<vector<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(edges);
|
||
cout << "\n初始化后，图为" << endl;
|
||
graph.print();
|
||
|
||
/* 深度优先遍历 DFS */
|
||
vector<Vertex*> res = graphDFS(graph, v[0]);
|
||
cout << "\n深度优先遍历（DFS）顶点序列为" << endl;
|
||
PrintUtil::printVector(vetsToVals(res));
|
||
|
||
// 释放内存
|
||
for (Vertex *vet : v) {
|
||
delete vet;
|
||
}
|
||
|
||
return 0;
|
||
}
|