Convex Hull (CH):
Given a set of points in 2 dimensions return the set of points on the convex hull in
sorted order.
Input and Output File Formats
The input needs to be in the 2d
points file format. The output needs to be in the sequence file format and must
contain the integer index of each of the points in the convex hull.
These indices need to be in sorted order with the leftmost point first
(minimimum x value).
Default Input Distributions
Each distribution should be run for
n=10,000,000. The
weights used for average time are given in parentheses. The
distribution on the perimeter of a circle is given a lesser weight to
account for the fact it is much more costly, and therefore would
dominate without a weight adjustment.

(10) Points selected at random uniformly within a unit circle.
uniform s d 2 <n> <filename>

(5) Points selected at random from the Kuzmin distribution.
plummer d 2 <n> <filename>

(1) Points selected at random uniformly on the perimiter of a unit circle.
uniform S d 2 <n> <filename>
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