codeforces-1027 A Palindromic Twist

#include <iostream>
#include <unordered_map>
#include <algorithm>
#include <vector>
#include <queue>

using namespace std;

bool sppalindjudge(string s,int n)
{
    char* pre = &s[0];
    char* end = &s[n-1];
    while(pre < end)
    {
        if(abs((*pre)-(*end))==0 || abs((*pre)-(*end))==2)
        {
            pre ++;
            end --;
        }
        else
        {
            return false;
        }    
    }
    return true;
}

int main()
{
    int T;
    while(cin >> T)
    {
        while(T --)
        {
            int n;
            string s;
            cin >> n;
            cin >> s;
            bool result = sppalindjudge(s,n);
            if(result)
                cout << "YES" << endl;
            else
                cout << "NO" << endl;
        }
    }
    return 0;
}