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  1. #include<bits/stdc++.h>
  2. using namespace std;
  3. vector<int>graph[1001];
  4. int visit[1001];
  5. int n, e;
  6. vector<int>ans;
  7.  
  8.  
  9. void dfs(int start)
  10. {
  11.     visit[start] = 1;
  12.  
  13.     for(int j = 0; j < graph[start].size(); j++)
  14.     {
  15.         int node = graph[start][j];
  16.         if(visit[node] == 0)
  17.         {
  18.             visit[node] = 1;
  19.             dfs(node);
  20.         }
  21.     }
  22.     ans.push_back(start);
  23. }
  24.  
  25. int main()
  26. {
  27.     cin>>n>>e;
  28.     int u, v;
  29.     for(int i = 1; i <= e; i++)
  30.     {
  31.         cin>>u>>v;
  32.         graph[u].push_back(v);
  33.     }
  34.  
  35.     for(int i = 1; i <= n; i++)
  36.     {
  37.         if(visit[i] == 0)
  38.         {
  39.             dfs(i);
  40.         }
  41.     }
  42.  
  43.     for(int i = ans.size()-1; i >= 0; i--)
  44.     {
  45.         cout<<ans[i]<<" ";
  46.     }
  47.  
  48.  
  49. }
  50.  
Success #stdin #stdout 0.01s 5324KB
comments (?)
stdin 
8 8
1 3
2 3
2 4
4 6
3 5
5 8
6 7
5 6
stdout 
2 4 1 3 5 6 7 8
https://ideone.com/vt1gx5
language:
C++ (gcc 8.3)
created:
17 days ago
visibility:
public

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