Describe an efficient algorithm that, given a set {x1, x2,...,xn} of points on the real line, determines the smallest set of unit-length closed intervals that contains all of the given points. (A unit length interval just means any closed interval with length 1. I. e., an interval [a, b] where b − a = 1.)
a. Briefly describe a greedy algorithm for the unit length interval problem.
b. State and prove a "swapping lemma" for your greedy algorithm.
c. Write a proof that uses your swapping lemma to show that your greedy algorithm does indeed produce a set of intervals that contain all of the points {x1, x2,...,xn} with the fewest number of intervals.
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