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# CS502 Assignment No. 02 Solution & Discussion Due Date: Dec 07, 2015

CS502 Assignment No. 02 Solution & Discussion Due Date: Dec 07, 2015

# CS502 - Fundamentals of Algorithms Assignment No. 02 Solution Fall 2015 Due Date Dec 07, 2015

 Assignment No. 02Semester: Fall 2015 CS502: Fundamentals of Algorithms Due Date:07/12/2015 Instructions Please read the following instructions carefully before submitting assignment:   It should be clear that your assignment will not get any credit (zero marks) if: The assignment is submitted after due date. The submitted assignment is other than .doc file. The submitted assignment does NOT open or file is corrupted. The assignment is copied (from other student or ditto copy from any other source).   Objective   The objective of this assignment is to enable students:   Write and solve recurrence relations of recursive algorithms using iteration method Design algorithm using Divide and conquer approach   Submission   You are required to submit your solution through LMS as MS Word document.   For any query about the assignment, contact at CS502@vu.edu.pk                                                              GOOD LUCK Question 1:   Consider the following recursive algorithm for computing the sum of the first n squares: Sum(n) = 12 + 22 + . . . + n2.   Algorithm: SUM(n) if n = 1 return 1 else return SUM(n − 1) + n ∗ n   Write recurrence relation for above algorithm and solve it using Iteration Method.   Question 2:   In Divide and conquer strategy, three main steps are performed:   1.      Divide: Divides the problem into a small number of pieces 2.      Conquer: Solves each piece by applying divide and conquer to it recursively 3.      Combine: Combines/merges the pieces together into a global solution.   Write an algorithm to find minimum number from a given array of size ‘n’ using divide and conquer approach. Lectures Covered:  This assignment covers first 15 Lectures. Deadline:             Your assignment must be uploaded/submitted at or before 07 Dec, 2015.

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### Replies to This Discussion

true solution

Part1

T(n)=T(n-1)+n*n

as we know that T(n-1)=T(n-2)+n*n

so we put this value

T(n)=T(n-2)+n*n+n*n =T(n-2)+2(n*n)

T(n)= T(n-2)+2(n*n)          T(n-2)=T(n-3)+n*n so we put this value

T(n)= T(n-3)+2(n*n)+n*n=T(n-3)+3(n*n)

T(n-3)+3(n*n)      T(n-3)=T(n-4)+n*n so we put this value

T(n)=T(n-4)+3(n*n)+n*n=T(n-4)+4(n*n)

..........

T(n)= T(n-k)+k(n*n)

If we set n=k

Then

T(n)= T(n-n)+n(n*n)=n^3

Part2:

SELECT(Array A,int p ,intr,int k=1)

if(p=r)

then return A[p]

else xßCHOOSE_PIVOT(A,p,r)

q ß PARTITION (A,p,r,x)

rankxß q-p+1

ifk=rankx

then return x

ifk<rankx

then return SELECT(A, p ,q-1, k)

Tariq bhai part 2 mai kia kia hai?

kr de copy paste phir

Very gud dude main b yehi krny lga bs

Tariq bhai kia cnfrm hai ye solution?

Part1

T(n)=T(n-1)+n*n             as we know that T(n-1)=T(n-2)+n*n so we put this value

T(n)=T(n-2)+n*n+n*n =T(n-2)+2(n*n)

T(n)= T(n-2)+2(n*n)                                       T(n-2)=T(n-3)+n*n so we put this value

T(n)= T(n-3)+2(n*n)+n*n= T(n-3)+3(n*n)

T(n-3)+3(n*n)                                                 T(n-3)=T(n-4)+n*n so we put this value

T(n)=T(n-4)+3(n*n)+n*n=T(n-4)+4(n*n)

..........

T(n)= T(n-k)+k(n*n)

If we set n=k

Then

T(n)= T(n-n)+n(n*n)=n^3

Part2:

SELECT(Array A,int p ,int r,int k=1)

if(p=r)

then return A[p]

else x  ßCHOOSE_PIVOT(A,p,r)

q ß PARTITION (A,p,r,x)

rankx  ß  q-p+1

if k= rankx

then return x

if k< rankx

then return SELECT(A, p ,q-1, k)

tarik bi help us is it correct and complete sol.

plzzz help us bro.

Tariq bhi mujhay sirf ina bta day k yeh theek soution hn na,..??
ap nay pehlay bhi aik solution bheja tha mn confirm nhi ..

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