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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. void fastio() {
  5.     ios_base::sync_with_stdio(false);
  6.     cin.tie(nullptr);
  7.     cout.tie(nullptr);
  8. }
  9.  
  10. int n, m;
  11. vector<vector<int>> adjList;
  12. vector<bool> vis;
  13. vector<int> topo;
  14.  
  15. void dfs(int node) {
  16.     vis[node] = true;
  17.     for (auto& v : adjList[node])
  18.         if (!vis[v])
  19.             dfs(v);
  20.     topo.push_back(node);
  21. }
  22.  
  23. void solve() {
  24.     while (cin >> n >> m) {
  25.         if (n == 0 && m == 0)
  26.             return;
  27.  
  28.         adjList.assign(n + 1, vector<int>());
  29.         vis.assign(n + 1, false);
  30.         topo.clear();
  31.         for (int i = 0; i < m; ++i) {
  32.             int u, v;
  33.             cin >> u >> v;
  34.             adjList[u].push_back(v);
  35.         }
  36.  
  37.         for (int i = 1; i <= n; ++i)
  38.             if (!vis[i])
  39.                 dfs(i);
  40.  
  41.         reverse(topo.begin(), topo.end());
  42.         for (auto& t : topo)
  43.             cout << t << ' ';
  44.         cout << '\n';
  45.     }
  46. }
  47.  
  48. int main() {
  49.     fastio();
  50.     solve();
  51.     return 0;
  52. }
  53.  
Success #stdin #stdout 0.01s 5288KB
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https://ideone.com/m7LUta
language:
C++ (gcc 8.3)
created:
5 days ago
visibility:
public

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