Infinitr Grid game,solution not giving correct resutl,please help

here is the link to question http://www.codechef.com/problems/IGAME

here is my code

#include<iostream>
#include<string>

using namespace std;

int main()
{
	short T=0,m=0,n=0; 
	short p=0,q=0,x=0,y=0;   
bool flag=true;
 short alice=1;
 short chk=0;

	cin>>T;
	
	chk=T;

	for(short i=0;i<T;i++)
	{
		
		short a=0;
		short r1,r2;
		 alice=1;
		cin>>m>>n>>p>>q;
		x=m;y=n;
		a=min(m-p,n-q);
		flag=true;
		while(flag)
		{
		 r1=x-p;
		 r2=y-q;
		

	 if((a>=r1 && a>=r2) && (a<=x && a<=y) &&  (x!=p && y!=q) )
	 {  
		 
			  x=x-a;
			  y=y-a;
				  
	 }

	else if(x!=p)
	 {
	    if(x!=p)
			 x=x-r1;
	}
	else if(y!=q)
	  {
			y=y-r2;
	  }
	
	if(x==p && y==q)
	{	flag=false;
	    
	    if(alice%2!=0)
		{	cout<<"Alice\n";
				
		}
		
		else if(alice%2==0)
		{
			cout<<"Bob\n";
			
		}
	}
	++alice;
  }
  }
	
	
		
	return 0;
}
//