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    USE THIS NO NEED FOR LOOP UPTU 1000 OR MORE.... string kangaroo(int x1, int v1, int x2, int v2) { int k=v1; int l=v2; int sum1=v1+x1; int sum2=v2+x2; while(1) {

    if((sum1>sum2)&&(v1>v2))
        return "NO";
    else if((sum2>sum1)&&(v2>v1))
        return "NO";
    else
    {
        if(sum1==sum2)
            return "YES";
    
        else
        {    
             sum1=sum1+v1;
             sum2=sum2+v2;
        }
    
    }
    

    }

    }