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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4. Consider the following algorithm.
ALGORITHM Mystery(n)
/Input: A nonnegative integer n
S+ 0
for i +1 to n do
S+S+i *i
return S
a. What does this algorithm compute?
b. What is its basic operation?
c. How many times is the basic operation executed?
d. What is the efficiency class of this algorithm?
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Transcribed Image Text:4. Consider the following algorithm. ALGORITHM Mystery(n) /Input: A nonnegative integer n S+ 0 for i +1 to n do S+S+i *i return S a. What does this algorithm compute? b. What is its basic operation? c. How many times is the basic operation executed? d. What is the efficiency class of this algorithm?
Expert Solution
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Step 1

Given algorithm:

ALGORITHM Mystery(n)

//Input: A nonnegative integer n

S <- 0

for i <- 1 to n do

   S <-  S + i * i

return S

a. This algorithm computes sum of squares up to n

for example, take n=4.

Algorithm Mystery(4) will compute:

s=0

for i=1 to 4

s=s+i*i

then for i=1,

S=S+1×1  =1
for i=2,

 S=S+2×2  =5 
for i=3,

S=S+3×3  =14
for i=4, 

S=S+4×4  =30

That is, 11+22+32+42=30
b. Basic operation of algorithm

Multiplication is the basic operation of this algorithm

 

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