Problems
Cities and roads
include <bits/stdc++.h>
using namespace std; int main() { int n,m,u,v; cin>>n; int say=0; vector<vector<int>>a(n,vector<int>(n,0)); for(int i=0;i<n;i++){ for(int j=0; j<n; j++){ cin>>a[i][j]; }
} for(int i=0; i<n;i++){ for(int j=i+1;j<n;j++){
if(a[i][j]==1){
say++;
}
}
} cout<<say<<endl;
}
include <iostream>
include <vector>
using namespace std; int f(vector<vector<int>>& a) { int n=a.size(); int y=0; for(int i=0;i<n;i++) { for(int j=i+1;j<n;j++) { if (a[i][j]==1) { y++; } } } return y; } int main() { int n; cin>>n; vector<vector<int>>a(n,vector<int>(n)); for (int i=0;i<n;i++) { for (int j=0;j<n;j++) { cin>>a[i][j]; } }
cout<<f(a)<<endl;
}