some tese case fail this code .....can you tell why that.....??

int solve(long int d,long int k) { int r=sqrt(d); int t,p,ans=4; //char *possible,*impossible;

if((r==1 && k>=4) || (r==2 && k>=4))
        return 1;


if(r>2)
{

        p=2,t=2;
        while((r-2)>2 && (r-t)>=2)
        {
                p=floor((r-t)/2);
                t=(t+p);
                ans+=4;
        }


}
 if(ans<=k)
            return 1;
        else
            return 0;        

}