func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int t;     scanf( %d , &t);     for (int i = 0; i < t; i++) {       int cont = 0;       int tamano;       scanf( %d , &tamano);       string x;       cin >> x;       for (int j = 0; j < tamano / 2; j++) {         if (x[j] == x[tamano - j - 1]) {           cont++;         } else if ((x[j] + 1 == x[tamano - j - 1] + 1) ||                    (x[j] + 1 == x[tamano - j - 1] - 1) ||                    (x[j] - 1 == x[tamano - j - 1] - 1) ||                    (x[j] - 1 == x[tamano - j - 1] + 1)) {           cont++;         } else {           printf( NO n );           break;         }       }       if (cont == tamano / 2) {         printf( YES n );       }     }     return 0;   }   