List of phones (tle)

[jack_sof]

i have a problem with list of phones
spoj.pl/problems/PHONELST/

#include<iostream>
#include<stdio.h>
#include<string.h>
using namespace std; 
int main()
{
    int t,i;
    cin>>t;
     for(i=0;i<t;i++)
      {
       int ahly=0,n,j,k;
       cin>>n;
       string arr[n+1];
       for(j=0;j<n;j++)
        {
         cin>>arr[j];
        }
         for(j=0;j<n;j++)
          {
           for(k=0;k<n;k++)
            {
             if(arr[j].size()<arr[k].size())
              {
               int length=arr[j].size();
                 if ( memcmp (arr[j].data(), arr[k].data(), length ) == 0 )
                 {
                    ahly++;break;
                 }
              }
            }
          }
           if(ahly!=0){ cout<<"NO"<<endl; }
           else { cout<<"YES"<<endl; }
      }
return 0;
}