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Lower bound for k-sorted arrays
We say that an array A[1..n] is k-sorted if it can be divided into k blocks, each of size n/k, such that the elements in each block are larger than the elements in earlier blocks, and smaller than elements in later blocks. The elements within each block need not be sorted
For this problem, you may assume that k divides n evenly.
(a) Write down the pseudocode for an algorithm that completely sorts an already k-sorted array of n elements in O(n log(n/k)) time. Write down the pseudocode, analyze its running time and explain why it correctly sorts a k-sorted array. 1
(b) Prove that any comparison-based algorithm to completely sort a k-sorted array requires ?(n log(n/k)) comparisons in the worst case, i.e., that your algorithm in part (a) is asymptotically optimal? Hint: It is not sucient to combine lower bounds to sort individual blocks! Think about how many dierent permutations are possible in a k-sorted array.
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