func_code_string: #include <bits/stdc++.h>   using namespace std;   bool func(char a, char b) {     if (a + 1 == b - 1) return true;     if (a + 1 == b + 1) return true;     if (a - 1 == b - 1) return true;     if (a - 1 == b + 1) return true;     return false;   }   int main() {     int t;     cin >> t;     while (t--) {       int n;       cin >> n;       string s;       cin >> s;       for (int i = 0, j = s.size() - 1; i < j; i++, j--) {         if (!func(s[i], s[j])) goto label;       }       cout <<  YES  << endl;       continue;     label:       cout <<  NO  << endl;     }   }   