Find the diameter of a convex polygon g. In other words, find a pair of points that have maximum distance between them.
n x1 y1 x2 y2 : xn yn
The first integer n is the number of points in g.
In the following lines, the coordinate of the i-th point pi is given by two real numbers xi and yi. The coordinates of points are given in the order of counter-clockwise visit of them. Each value is a real number with at most 6 digits after the decimal point.
Print the diameter of g in a line. The output values should be in a decimal fraction with an error less than 0.000001.
3 0.0 0.0 4.0 0.0 2.0 2.0
4 0.0 0.0 1.0 0.0 1.0 1.0 0.0 1.0