Does robot moves circular

PROBLEM :
Given a sequence of moves for a robot, check if the sequence is circular or not. A sequence of moves is circular if first and last positions of robot are same. A move can be on of the following.
   
    G - Go one unit
    L - Turn left
    R - Turn right

Input:
The first line of input contains an integer T denoting the number of test cases.
The first line of each test case is a String in capital letter, sequence of moves consisting only {R,G,L}.

Output:
Print Given sequence of moves is circular if first and last positions of robot are same. else Given sequence of moves is NOT circular.

Constraints:
1 = T = 50
1 = size of string = 200

Example:

Input:
3
GLGLGLG
GLLG
GGGGL

Output:
Circular
Circular
Not Circular

--------------------------------------------------------------------------------
SIMPLE c++ IMPLEMENTATION :
--------------------------------------------------------------------------------

#include<iostream>
using namespace std;
#define N 0
#define E 1
#define S 2
#define W 3

int robot(string str)
{
    int x=0,y=0 ;
    int dir=N ;
   
    for(int i=0;i<str.length();i++)
    {
        if(str[i]=='R')
            dir=(dir+1)%4;
        else if(str[i]=='L')
             dir=(4+dir-1)%4;
        else
        {
            if(dir==N)
                y++ ;
            else if(dir==E)
                x++ ;
            else if(dir==S)
                y-- ;
            else
                x-- ;
        }
    }
   
    return (x==0&&y==0) ;
}

int main()
{
int t ;
cin>>t ;
while(t--)
{
   string str ;
   cin>>str ;
 
   if(robot(str))
       cout<<"Circular" ;
   else
       cout<<"Not Circular" ;
   cout<<endl ;
}
return 0;
}

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