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tepyotin2

Friendship Circle

tepyotin2
May 10th, 2025
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  1. #include <bits/stdc++.h>
  2.  
  3. using namespace std;
  4.  
  5. int n;
  6. int grid;
  7. vector<int> friends[201];
  8. bool visited[201];
  9. int ans;
  10.  
  11. void dfs(int val){
  12.     visited[val] = true;
  13.     for(auto v: friends[val]){
  14.         if(!visited[v]) dfs(v);
  15.     }
  16. }
  17.  
  18. int main(){
  19.     //freopen("circle.in", "r", stdin);
  20.    
  21.     cin >> n;
  22.     for(int i=1; i<=n; i++){
  23.         for(int j=1; j<=n; j++){
  24.             cin >> grid;
  25.             if(grid == 1){
  26.                 friends[i].push_back(j);
  27.                 friends[j].push_back(i);
  28.             }
  29.         }
  30.     }
  31.     for(int i=1; i<=n; i++){
  32.         if(!visited[i]){
  33.             dfs(i);
  34.             ans++;
  35.         }
  36.     }
  37.     cout << ans << '\n';
  38.    
  39.     return 0;
  40. }
  41.  
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