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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3. typedef long long ll;
  4. const int Mod=998244353;
  5.  
  6. void solve() {
  7.         int n;
  8.         string s;
  9.         cin >> n >> s;
  10.         ll ans =0;
  11.         int cnt=0;
  12.         for(int i=0;i<s.size();i++){
  13.             if(s[i]=='1') cnt++;
  14.         }
  15.         ans=cnt;
  16.         ans*=n;
  17.         ans-=cnt;
  18.         ans+=n-cnt;
  19.         cout << ans << '\n';
  20. }
  21.  
  22. int main(){ 
  23.     ios::sync_with_stdio(false);
  24.     cin.tie(nullptr);
  25.  
  26.     int t;
  27.     cin >> t;
  28.     while (t--) solve();
  29.  
  30.  
  31.     return 0;
  32. }
  33.  
Success #stdin #stdout 0.01s 5312KB
comments (?)
stdin
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5
3
101
1
1
5
00000
2
11
3
010
stdout
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5
0
5
2
4
https://ideone.com/HtU6aE
language:
C++ (gcc 8.3)
created:
5 days ago
visibility:
public

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