CodeChef::CSUB
#include <bits/stdc++.h>
using namespace std ;
#define boost ios::sync_with_stdio(0);cin.tie(0)
#define ll long long
int main (){
boost ;
ll t ;
cin >> t ;
while (t--)
{
ll n ;
cin >> n ;
string seq ;
cin >> seq ;
ll count{0};
for (int i = 0; i < seq.size(); i++){
if (seq[i] == '1') count ++ ;
}
cout << (count*(count+1))/2 << '\n';
}
return 0 ;
}
Comments
Post a Comment