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 6E
Program Plan Intro

Asymptotic Notations:

In asymptotic analysis of algorithms, mathematical tools are used to represent time complexity of algorithm.

  • such mathematical tools are known as Asymptotic notations. Some of the asymptotic notations are
    • Big-O.
    • Big Theta

Big-O:

A function “g(n)” is O(f(n)) if there exists a constant c > 0 such that cf(n) grows faster than “g(n)” for all n>=n0 , that is, “g(n)” is O(f(n)) iff for some constants “c” and "n0", g(n)<=cf(n) for all n>=n0. Here, “f(n)” denotes the upper bound for “g(n)”. The above statement can be read as follows :

  • “n” is size of data set
  • “f(n)” denotes a function calculated while taking n as parameter
  • O(f(n)) means that curve denoted by “f(n)” is an upper bound for a function’s need for resources.

Big Theta:

A function “g(n)” is Θ(f(n)) iff two positive constants “c1” and “c2” and a positive integer "n0" exists such that c1f(n)g(n)c2f(n) for all n>=n0, that is, “f(n)” denotes exact bound for “g(n)”, which denotes that growth rate of “g(n)” and “f(n)” are equal. The above statement can be read as follows :

  • “n” is size of data set
  • “f(n)” denotes a function that is been calculated taking “n” as parameter
  • Θ(f(n)) means that curve denoted by “f(n)” is an exact bound for a function’s need for resources.

Explanation of Solution

b) f(n) + g(n) is Θ(min(f(n),g(n)))

Explanation:

  • Take f(n) = n and g(n) = 1/n.
  • Now, f(n)+ g(n)&

Explanation of Solution

c) 2na is O(2n)

Explanation:

  • The function 2na is not O(2n), as there is no constant c 2na/2n= 2n(a-

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