@Amit: in most of the algos for convex hull the result would be the points
on the hull in clockwise or counter clockwise order
now we have a point P that we want to find the farthest point from it now
imagine the list as if it's circular and the range where binary search is
applied on starts after the index of P and ends before it. in this range the
distance between the points and P increases until it reaches the maximum
distance then starts to decrease since it's a convex hull and the points are
sorted clockwise or counter clockwise
so each time you need to check the distance between P and the two middle
points to see in which direction the distance increases
i hope it's clear now

@Jitendra: i think that Harit is right but if the points are not sorted the
worst case would be O(nlogn)

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