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SOLVED CS502 Assignment No. 01 Solution and Discussion

Assignment No. 01 SEMESTER Fall 2019
CS502 Fundamentals of Algorithms
Total Marks: 20Due Date: 13/11/2019
Instructions
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Objective
The objective of this assignment is
• To give basic knowledge and understanding of Algorithms.
• To be able to design simple algorithms.
• To be able to understand and calculate the complexity of algorithms.Note:
Your answer must follow the below given specifications.
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• Font in Italic is not allowed at all.
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• Your answer should be precise and to the point, avoid irrelevant detail.Lectures Covered: This assignment covers Lecture # 01  06
Deadline
Your assignment must be uploaded/submitted at or before 13/11/2019.Assignment Statement:
In mathematics Prime is a number which can be only divisible by 1 and itself. Examples of prime numbers are, 1 , 3 , 5 , 7 , 11 , 13 , 17 , 19 , 23 , 29 , 31 etc. When these numbers get large, then it is very difficult to manually identify them as to be prime or not prime. For example the numbers like, 443 and 44371 cannot easily identify as Prime.
There may be many algorithms which can be written for the identification of a number to be prime or not prime.Question No 01: (Marks: 10)
You are required to design (write) a simple algorithm (Only Pseudo code) which can identify a number to be Prime or Not Prime.Question No 02: (Marks: 10)
You are required to calculate (Step by Step) the worst case time complexity T(n) of the algorithm designed in Question No. 01.=====================================Ended=======================================
For any query about the assignment, contact at [email protected]
GOOD LUCK

@zareen said in CS502 Assignment No. 01 Solution and Discussion:
Question No 02: (Marks: 10)
You are required to calculate (Step by Step) the worst case time complexity T(n) of the algorithm designed in Question No. 01.Solution:
Question No. 02: The step by stem analysis of the algorithm designed in question 1 is as follow,The time taken by each statement (step) is given as follows,
Step 1: C1 // Execute only 1 time or Constant Time or O (1)
Step 2: C2 // Execute only 1 time or Constant Time or O (1)
Step 3: n 2 // Execute n 2 times
Step 4: n 2 // Execute n 2 times
Step 5: n – 2 // Execute n 2 times
Step 6: C3 // Execute only 1 time or Constant Time or O (1)
Step 7: C4 // Execute only 1 time or Constant Time or O (1)
Step 8: C5 // Execute only 1 time or Constant Time or O (1)
Step 9: C6 // Execute only 1 time or Constant Time or O (1)Total time T(n) can be calculated as follows,
T(n) = C1 + C2 + (n 2 ) + (n 2 ) + (n 2 ) + C3 + C4 + C5 + C6
T(n) = C1 + C2 + n 2 + n 2 + n 2 + C3 + C4 + C5 + C6
T(n) = C1 + C2 + n + n + n  6 + C3 + C4 + C5 + C6
T(n) = 3n + C1 + C2 + C3 + C4 + C5 + C6 6
T(n) = 3n + (C1 + C2 + C3 + C4 + C5 + C6 6)
T(n) = 3n + C7 // C7 = (C1 + C2 + C3 + C4 + C5 + C6 6)
T(n) = n // Ignoring constant termsOr T(n) = O (n )

@zareen said in CS502 Assignment No. 01 Solution and Discussion:
Question No 01: (Marks: 10)
You are required to design (write) a simple algorithm (Only Pseudo code) which can identify a number to be Prime or Not Prime.Solution:
Question No. 01: The algorithm for the identification of Prime number is as follows,1 PRIME (int Number)
2 int Count ← 0
3 for i ← 2 to Number – 1
4 if ( Number % i equal to 0)
5 Increment Count
6 If (Count is equal to 0)
7 Number is Prime
8 else
9 Number is NOT Prime 
Question No. 02: The step by stem analysis of the algorithm designed in question 1 is as follow,
The time taken by each statement (step) is given as follows,
Step 1: C1 // Execute only 1 time or Constant Time or O (1)
Step 2: C2 // Execute only 1 time or Constant Time or O (1)
Step 3: n 2 // Execute n 2 times
Step 4: n 2 // Execute n 2 times
Step 5: n – 2 // Execute n 2 times
Step 6: C3 // Execute only 1 time or Constant Time or O (1)
Step 7: C4 // Execute only 1 time or Constant Time or O (1)
Step 8: C5 // Execute only 1 time or Constant Time or O (1)
Step 9: C6 // Execute only 1 time or Constant Time or O (1)Total time T(n) can be calculated as follows,
T(n) = C1 + C2 + (n 2 ) + (n 2 ) + (n 2 ) + C3 + C4 + C5 + C6
T(n) = C1 + C2 + n 2 + n 2 + n 2 + C3 + C4 + C5 + C6
T(n) = C1 + C2 + n + n + n  6 + C3 + C4 + C5 + C6
T(n) = 3n + C1 + C2 + C3 + C4 + C5 + C6 6
T(n) = 3n + (C1 + C2 + C3 + C4 + C5 + C6 6)
T(n) = 3n + C7 // C7 = (C1 + C2 + C3 + C4 + C5 + C6 6)
T(n) = n // Ignoring constant termsOr T(n) = O (n )

Solution:
Question No. 01: The algorithm for the identification of Prime number is as follows,1 PRIME (int Number)
2 int Count ← 0
3 for i ← 2 to Number – 1
4 if ( Number % i equal to 0)
5 Increment Count
6 If (Count is equal to 0)
7 Number is Prime
8 else
9 Number is NOT Prime 


