func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int t;     cin >> t;     while (t--) {       int n;       cin >> n;       string s;       cin >> s;       string ans;       ans = s;       sort(ans.begin(), ans.end());       int cnt = 0;       for (int i = 0; i < n; i++) {         if (ans[i] != s[i]) cnt++;       }       cout << cnt << endl;     }   }   