Divide and conquer algorithm

Apr 12, 2020Download as PPT, PDF0 likes425 views

This is a very important type of algorithm paradigm which is mostly used to solve any kind of problems like sorting ( merge sort, quick sort), binary search, Tower of Hanoi, etc.

Prepared By:
Dr. Chandan Kumar
Assistant Professor, Computer Science & Engineering Department
Invertis University, Bareilly

Introduction
Algorithm
Divide &
Conquer
Greedy Brute Force
Dynamic
Programming
Backtracking Recursive
Branch &
Bound
Randomized

Divide and Conquer
 It is an algorithm design paradigm which is based on
multi branch recursion.
 The divide-and-conquer paradigm is often used to find
an optimal solution to a problem.
 It is a technique to break a problem recursively into
sub-problems of the same or related type.
 Sub-programs have to be simple enough to be solved
directly.
 The solutions to these sub-problems are then
combined to solve the original problem

Divide and Conquer
 D&C follow following three steps
 Divide/Break- Break original problem into sub-
problems
 Conquer/Solve - Solve every individual sub-problem,
recursively
 Combine/Merge- Place the solutions to the sub-
problems together to solve the entire problem

Divide and Conquer
 In short, D&C is a approach in which the entire
problem (i.e. too large to comprehend or overcome at
once) is divided into smaller pieces, the pieces are
solved separately, and all the pieces are combined
together.

Implementation
 Program to calculate pow(x,n) in C language
#include<stdio.h>
#include<conio.h>
/* Function to calculate x raised to the power y */
int power(int x, unsigned int y)
{
if (y == 0)
return 1;
else if (y%2 == 0)
return power(x, y/2)*power(x, y/2);

Implementation
else
return x*power(x, y/2)*power(x, y/2);
}
/* Program to test function power */
int main()
{
int x = 2;
unsigned int y = 3;
printf("%d", power(x, y));
return 0;
}

Application
 Following computer algorithms are based on divide
and conquer programming approach
 Bineary Search
 Merge Sort
 Quick Sort
 Maximum and Minimum Problem
 Tower of Hanoi
 Strassen's Matrix multiplication
 Karatsuba Algorithm

Complexity
 The complexity of the divide-and-conquer algorithm is
calculated using the master theorem.
T(n) = aT(n/b) + f(n), where
n = size of input
a = number of sub-problems in the recursion
n/b = size of each sub-problem. All sub-problems are
assumed to have the same size
f(n) = cost of the work done outside the recursive call,
which includes the cost of dividing the problem and
cost of merging the solutions

Advantages
 The complexity for the multiplication of two matrices
using the naive method is O(n3), whereas using the
divide and conquer approach (ie. Strassen's matrix
multiplication) is O(n2.8074).
 This strategy also simplifies other issues such as the
Tower of Hanoi.
 Suitable for multiprocessing systems.
 It does use memory caches effectively.

Divide and Conquer Algorithms - D&C forms a distinct algorithm design technique in computer science, wherein a problem is solved by repeatedly invoking the algorithm on smaller occurrences of the same problem. Binary search, merge sort, Euclid's algorithm can all be formulated as examples of divide and conquer algorithms. Strassen's algorithm and Nearest Neighbor algorithm are two other examples.

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Title: A Quick and Illustrated Guide to APA Style Referencing (7th Edition) This visual and beginner-friendly guide simplifies the APA referencing style (7th edition) for academic writing. Designed especially for commerce students and research beginners, it includes: ✅ Real examples from original research papers ✅ Color-coded diagrams for clarity ✅ Key rules for in-text citation and reference list formatting ✅ Free citation tools like Mendeley & Zotero explained Whether you're writing a college assignment, dissertation, or academic article, this guide will help you cite your sources correctly, confidently, and consistent. Created by: Prof. Ishika Ghosh, Faculty. 📩 For queries or feedback: [email protected]

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