EBK DATA STRUCTURES AND ALGORITHMS IN C
EBK DATA STRUCTURES AND ALGORITHMS IN C
4th Edition
ISBN: 9781285415017
Author: DROZDEK
Publisher: YUZU
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Chapter 2, Problem 2E
Program Plan Intro

Big O definition:

The Big O definitions for “f1(n)” and “f2(n)” are shown below:

  • The function “f1(n)” is O(g1(n) if positive numbers “c1” and “N1” exists such that f1(n)c1g1(n) for all nN1.
  • The function “f2(n)” is O(g2(n) if positive numbers “c2” and “N2” exists such that f2(n)c2g2(n) for all nN2.

Explanation of Solution

(b) O(g1(n)+g2(n)) is O(g2(n))

  • Let g1(n)g2(n) and c=max(c1,c2).
  • Multiply both sides of equation by constant “c” to obtain cg1(n)cg2(n)

Explanation of Solution

(c) f1(n).f2(n) is O(g1(n).g2(n))

  • The product rule, f1(n).f2(n) is O(g1(n)

Explanation of Solution

(d) O(cg(n)) is O(g(n))

  • The statement O(cg(n)) is O(g(n)) means that any function “f” which is O(cg) is also O(g)

Explanation of Solution

(e) “c” is O(1)

  • A constant “c” is O(1) if positive numbers “c1” and “N” exists such that cc1.1 for all nN

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