# What is Subarray? | What are possible Solutions to Subarray with a Given Sum

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What is Subarray? | What are possible Solutions to Subarray with a Given Sum. Are you looking for a subarray whose sum is given? Let us assist you in finding it! You will be able to find the subarray that matches your sum by entering the sum you are looking for and our algorithm will search our database of subarrays.

## Introduction:

The concept of subarrays is one of the most powerful tools in the world of computing. Our computers are capable of processing large amounts of data quickly and efficiently.

The purpose of this blog is to provide an overview of what a subarray is and how it can be used in various applications.

We will also discuss how to efficiently find subarrays with a given sum, as well as the various complications involved in this process.

We are about to dive into the fascinating world of subarrays, so let’s get started!

## What is Array?

The array is a type of data structure that allows us to store and access data in an organized manner.

It is a collection of related data items that are usually of the same type and have a fixed length.

Programmers commonly use arrays to represent lists, vectors, records, tables, and other data structures.

## What is Subarray?

A subarray consists of a set of contiguous elements within an array. Array elements with specified starting and ending points are called elements in an array.

In addition to processing and analyzing data, subarrays can be used for optimizing algorithms as well.

Example

An example of a subarray

A, A, A, …, A[n-1] are subarrays of A, A, A, …, A[n-1] if 0 is the starting index and n-1 is the ending index.

By selecting any two indexes i and j, a subarray of length n can also be formed.

The arrays A, A, A, A, A, A, and A create a subarray of the arrays A, A, A, A, A, A, and A.

## Subarray with Given Sum

Subarrays with a given sum are classic algorithmic problems. It is the purpose of this problem statement to find a subarray in an array such that the sum of the elements in the subarray equals a given value.

It is possible to solve this problem in a variety of ways, as discussed below.

Example:

Examples of Subarray with Given Sum:

### Problem Statement

Given an array of n elements A, A, A, …, A[n-1] and a number, k, find out if there is a subarray that has a sum equal to k.

## Possible Solutions to Subarray with Given Sum

There are two possible solutions to the subarray with the given sum problem – the brute force approach and the optimized approach.

1. ### Brute Force Approach to Subarray with Given Sum

The brute force approach consists of checking all the possible subarrays one by one to ensure that the sum of elements in each is equal to k.

#### a.Description of the Brute Force Approach

An approach based on brute force is a straightforward way to solve a problem. After looping through the subarrays of the array, the brute force approach checks to see if the sum of the elements in each subarray equals k. It stops and returns the subarray if the sum meets the given value.

#### b.Pros of the Brute Force Approach

A simple and easy-to-implement approach, brute force can be used. Furthermore, the approach is relatively fast since its time complexity is O(n2), where n represents the array size.

Nevertheless, the brute force approach is not very efficient because the time complexity is O(n2).

1. ### Optimized Approach to Subarray with Given Sum

The best method for finding the subarray with the given sum is to use a sliding window technique.

#### a.Description of Optimized Approach

Optimally, the subarray with the given sum should be determined using a sliding window on the array. Two pointers are used to define the sliding window; one pointing to the beginning of the subarray and the other pointing to the end of the subarray. The elements of each subarray are added together, and the result is compared with the given value.

It stops and returns the subarray if the sum equals the given number. If the sum is not equal to the given number, the pointers are moved to either increase or decrease the sum of the elements in the subarray.

#### b.Pros of the Optimized Approach

Contrary to the brute force approach, the optimized approach has a time complexity of O(n), which is more efficient than the brute force approach.

In other words, the time complexity of the approach is determined by the number of elements in the array, not by the number of subarrays within the array. Optimized approaches, however, are more complex and difficult to implement.

## Conclusion:

A subarray with a given sum is one of the most important concepts in computer science. It is possible to find subarrays of an array in a specified range of values by finding subarrays that add up to a given value. It discusses two approaches for implementing a subarray with a given sum: the brute-force approach and the optimized approach.