int seaLevel(double ar[],int len)
{
	int k=0;
	int end=len-1;
	int start=0;
	while(k==0)
	{
		if(start!=end-2)
		{

		if(ar[end/2+start/2]>0)
		{
			if(ar[(end/2+start/2)+1]<0)
			{
				k=end/2+start/2;
			}
			start=end/2+(start/2);
		}
		else
		{
			end=end/2+(start/2);
		}
		}
		else
		{
			k=start+1;
		}
	}
	return k;
}