Palindrome String

PROBLEM :

Given a string s check if it is palindrome or not.

Input:
The first line contains 'T' denoting the number of testcases. Then follows description of testcases.
Each case begins with a single integer N denoting the length of string. The next line contains the string s.


Output:
Print "Yes" if it is a palindrome else "No". (Without the double quotes)


Constraints:
1<=T<=30
1<=N<=100


Example:
Input:
1
4
abba

Output:
Yes

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SIMPLE c++ IMPLEMENTATION :
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#include<iostream>
using namespace std;
int main()
 {
int t,n,i,j ;
char str[100] ;
cin>>t ;
while(t--)
{
   cin>>n ;
 
   for(i=0;i<n;i++)
       cin>>str[i] ;
 
   i=0;
   j=n-1 ;
 
   while(i<j&&i!=j)
   {
       if(str[i]!=str[j])
           break ;
       i++ ;
       j-- ;
   }
 
   if(i==j||i>j)
       cout<<"Yes" ;
   else
       cout<<"No" ;
     
   cout<<endl ;
 
}
return 0;
}

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