PROBLEM STATEMENT

Given a real number n, a set of points P in the XY plane is called n-squared if it is not empty 
and there exists a square of side n in the XY plane with its sides parallel to the axes such that 
a point from the given set of points is in P if and only if it is contained within the square. A 
point lying on a side or a vertex of the square is considered to be contained in it.

You will be given two ints nlow and nhigh. You will also be given two vector <int>s x and y such 
that the coordinates of point i are (x[i],y[i]). Return the number of subsets of the input set 
described by x and y that are n-squared for some n between nlow and nhigh, inclusive.


DEFINITION
Class:RangeSquaredSubsets
Method:countSubsets
Parameters:int, int, vector <int>, vector <int>
Returns:long long
Method signature:long long countSubsets(int nlow, int nhigh, vector <int> x, vector <int> y)


CONSTRAINTS
-nlow will be between 1 and 100000000 (10^8), inclusive.
-nhigh will be between nlow and 100000000 (10^8), inclusive.
-x and y will contain between 1 and 40 elements, inclusive.
-x and y will contain the same number of elements.
-Each element of x and y will be between -100000000 (-10^8) and 100000000 (10^8), inclusive.
-All described points will be different.


EXAMPLES

0)
5
5
{-5,0,5}
{0,0,0}

Returns: 5

The following subsets are 5-squared: {(-5,0)}, {(0,0)}, {(5,0)}, {(-5,0),(0,0)}, {(0,0),(5,0)}.

1)
10
10
{-5,0,5}
{0,0,0}

Returns: 5

The following subsets are 10-squared: {(-5,0)}, {(5,0)}, {(0,0),(5,0)}, {(-5,0),(0,0)}, 
{(-5,0),(0,0),(5,0)}.

2)
1
100
{-5,0,5}
{0,0,0}

Returns: 6

{(-5,0),(5,0)} is not x-squared for any x. From the previous 2 examples you can infer that all 
other non-empty subsets are 5-squared or 10-squared.

3)
3
100000000
{-1,-1,-1,0,1,1,1}
{-1,0,1,1,-1,0,1}

Returns: 21



4)
64
108
{-56,-234,12,324,-12,53,0,234,1,12,72}
{6,34,2,235,234,234,342,324,234,234,234}

Returns: 26



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