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  1. #include<iostream>
  2. using namespace std;
  3.  
  4. bool used[101][101];
  5.  
  6. int main(){
  7.   int n, m; cin >> n >> m;
  8.   for(int i = 0; i < m; i++){
  9.      int a,b; cin >> a >> b;
  10.      used[a][b] = used[b][a] = 1;
  11.   }
  12.   for(int i = 1; i <= n; i++){
  13.      for(int j = i+1; j <= n; j++){
  14.         if(used[i][j] == false){
  15.            cout << "NO\n";
  16.            return 0;
  17.         }
  18.      }
  19.   }
  20.   cout << "YES\n";
  21.   return 0;
  22. }
Success #stdin #stdout 0s 3152KB
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stdin
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Standard input is empty
stdout
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YES
https://ideone.com/DXwRyg
language:
C++14 (gcc 8.3)
created:
9 years ago
visibility:
public

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