h that at most k elements of A are less than or equal to x, or nil if no such element exists. A simple way to implement it is as follows: SimpleSelection(A, k) 1 if k > A.length 2 return nil 3 else sort A in ascending

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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Given an array A and a positive integer k, the selection problem amounts to finding the largest
element x ∈ A such that at most k elements of A are less than or equal to x, or nil if no such
element exists. A simple way to implement it is as follows:
SimpleSelection(A, k)
1 if k > A.length
2 return nil
3 else sort A in ascending order
4 return A[k]
Example A = (29, 28, 35, 20, 9, 33, 8, 9, 11, 6, 21, 28, 18, 36, 1) k = 6

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