func_code_string: #include <bits/stdc++.h>   using namespace std;   int T, n;   char s[50];   int a[50], b[50];   int main() {     scanf( %d , &T);     while (T--) {       int cnt = 0;       scanf( %d , &n);       scanf( %s , s + 1);       for (int i = 1; i <= n; ++i) a[i] = s[i] -  a , b[i] = a[i];       sort(a + 1, a + n + 1);       for (int i = 1; i <= n; ++i)         if (a[i] != b[i]) cnt++;       cout << cnt << endl;     }     return 0;   }   