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Arrays

6.4K+ posts

Last Updated: 07 March 2025

The 4Sum problem is an extension of the well-known 2-Sum and 3-Sum problems, where the goal is to find four numbers in an array that sum up to a given target. It’s a commo...read more

Arrays

DSA

4Sum

Flipping Bits with K-Window

Last Updated: 02 March 2025

Given a binary array arr[] of size n, the task is to find minimum number of operations to convert all 0s to 1s. In one operation, we can select a subarray (window) of leng...read more

Arrays

DSA

Commonly Asked Data Structure Interview Questions on Array

Last Updated: 19 May 2025

Arrays are one of the most fundamental data structures in computer science.It allows for efficient access to elements using an index, which is particularly useful for appl...read more

Arrays

DSA

Traversal in Array

Last Updated: 19 February 2025

Traversal in an array refers to the process of accessing each element in the array sequentially, typically to perform a specific operation, such as searching, sorting, or ...read more

Arrays

Traversal

DSA

Sorted Array to Wave Form

Last Updated: 11 February 2025

Given a sorted array of integers, the task is to sort the array into a wave array. An array arr[0..n-1] is sorted in wave form if:arr[0] = arr[1] = arr[2] = arr[3] = arr[4...read more

Arrays

Sorting

DSA

Minimum Removals for Target Sum

Last Updated: 09 January 2025

Given an array of positive integers arr[] and an integer k, you can remove either the leftmost or rightmost element from the array in one operation. After each operation, ...read more

Arrays

DSA

Sliding Window 23

3 Sum - Count Triplets With Given Sum In Sorted Array

Last Updated: 10 February 2025

Given a sorted arrayarr[]and a target value, the task is to find the count of triplets present in the given array having sum equal to the given target.More specifically, t...read more

Arrays

two-pointer-algorithm

DSA

3Sum

Merge Sort Based Practice Problems

Last Updated: 15 November 2024

Problems Based on Merge of Merge SortMerge Two Sorted ArraysMerge Two Sorted Arrays with O(1) SpaceUnion of Two Sorted ArraysIntersection of Two Sorted ArraysMerge Two Sor...read more

QuickSort Based Practice Problems

Last Updated: 15 November 2024

Problems based on Partitioning AlgorithmSorting an Array of Two Types.Stable Binary SortingStable Binary Sorting with O(1) SpaceThree Way Partitioning Around a RangeThree ...read more

Longest Common Prefix using Sorting

Last Updated: 14 November 2024

Given an array of stringsarr[],the task is to return thelongest common prefixamong each and every strings present in the array. If there’s no prefix common in all the stri...read more

Arrays

Strings

Sorting

Longest Common Prefix

DSA

Sort an array having 3 types of Values

Last Updated: 11 November 2024

We are given an array containing three different types of elements, and the task is to sort the array. This problem has been asked in various forms, and in this article, w...read more

Three way partitioning around an element

Last Updated: 10 December 2024

Given an array arr[] of integers and a value pivot, the task is to partition the array around the pivot such that array is divided in three parts.All elements smaller than...read more

Last Updated: 09 November 2024

Given an array arr[] of integers, the task is to partition the array based on even and odd elements. The partition has to be stable, meaning the relative ordering of all e...read more

Delete an Element from the end of an array

Last Updated: 08 November 2024

Given an array of integers, the task is to delete an element from the end of the array.Examples:Input: arr[] = [10, 20, 30, 40]Output: [10, 20, 30]Input: arr[] = [20]Outpu...read more

Arrays

DSA

Delete an Element from a Given Position in an Array

Last Updated: 08 November 2024

Given an array of integers, the task is to delete an element from a given position in the array.Examples:Input: arr[] = [10, 20, 30, 40], pos = 1Output: [20, 30, 40]Input:...read more

Arrays

DSA

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