Database System Concepts
Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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Concept explainers

Counting sort
The counting sort algorithm sorts an array’s contents by counting the repetition of each element that occurs in the array. A counting sort algorithm is a stable algorithm that works the best when the range of elements in the array is small, say for examp…
Question

Let A be the set of all strings of decimal digits of length 5. For example 24157 and
05189 are strings in A.
(a) How many strings in A have exactly one 7?

(b) How many strings in A have at least two 2’s?

(c) How many strings in A have the digits in a strictly decreasing order? For example
97643 and 54321 are such strings, but 14820 and 95421 are not.

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