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  1. #include<bits/stdc++.h>
  2. using namespace std;
  3. int n,m;
  4. vector<int> adj[1001];
  5. int main()
  6. {
  7.     cin >> n >> m;
  8.     for(int i = 0; i < m; i++){
  9.         int x,y; cin >> x >> y;
  10.         adj[x].push_back(y);
  11.         adj[y].push_back(x);
  12.     }
  13.     for(int i = 1; i <= n;i++){
  14.         cout<< i << ": ";
  15.         for(int x : adj[i]){
  16.             cout << x << " ";
  17.         }
  18.         cout << endl;
  19.     }
  20. }
Success #stdin #stdout 0.01s 5320KB
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stdout 
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https://ideone.com/dfJT3O
language:
C++ (gcc 8.3)
created:
12 days ago
visibility:
public

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