func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int t;     cin >> t;     int n;     while (t--) {       int n;       string s;       cin >> n;       cin >> s;       int flag = 1, start = 0, end = n - 1;       while (start <= end) {         char ssp = s[start] + 1;         char sep = s[end] + 1;         char sem = s[end] - 1;         char ssm = s[start] - 1;         if ((ssp == sep) || (ssp == sem) || (ssm == sep) || (ssm == sem))           flag = 1;         else {           flag = 0;           break;         }         start++;         end--;       }       if (flag == 0)         cout <<  NO  << endl;       else         cout <<  YES  << endl;     }     return 0;   }   