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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Consider the following algorithm segment.
For each positive integer n, let bn be the number of iterations of the following while loop.
while (n > 0)
n := n div(3)
end while
Find a recurrence relation for b
Ⓒ
To answer this question, observe that for each integer k ≥ 3, n div(3) = Lk/3]
Thus, when the algorithm segment is run for a particular k and the while loop has iterated one time, the input to the next iteration is [k/3]
It follows that the number of iterations of the loop for k is 1✔✔ more than the number of iterations for [k/3]
In other words, for every integer k ≥ 1
, we have which of the following?
bk = 1 + bkl
o b₁ = 1 + b
k/3
Lk/3]
bk = 1 + b[k/31
bk = 3 + bk/3
b₁ = 3 + blk/31
bk = 3 + b
DIK/31
In addition, the initial values for the sequence b₁,b₂, bz₁
are b₁ = 1
and b₂ = 1
©
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Transcribed Image Text:Consider the following algorithm segment. For each positive integer n, let bn be the number of iterations of the following while loop. while (n > 0) n := n div(3) end while Find a recurrence relation for b Ⓒ To answer this question, observe that for each integer k ≥ 3, n div(3) = Lk/3] Thus, when the algorithm segment is run for a particular k and the while loop has iterated one time, the input to the next iteration is [k/3] It follows that the number of iterations of the loop for k is 1✔✔ more than the number of iterations for [k/3] In other words, for every integer k ≥ 1 , we have which of the following? bk = 1 + bkl o b₁ = 1 + b k/3 Lk/3] bk = 1 + b[k/31 bk = 3 + bk/3 b₁ = 3 + blk/31 bk = 3 + b DIK/31 In addition, the initial values for the sequence b₁,b₂, bz₁ are b₁ = 1 and b₂ = 1 ©
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