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DSA / Data Structures

Data Structures

8.9K+ posts

Fill and Empty a Queue

Last Updated: 23 July 2025

Given an empty queue and an array of elements, we need to perform the following two operations.1. Filling a QueueFilling a queue refers to the process of adding array elem...read more

Data Structures

Commonly Asked Data Structure Interview Questions on Matrix

Last Updated: 23 July 2025

A Matrix can be considered as array of arrays or 2D array. We use matrix data structure to store two dimensional data.Top Coding Interview Questions on MatrixThe following...read more

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Stack Implementation using Deque

Last Updated: 23 July 2025

A doubly ended queue or deque allows insertion and deletion at both ends. In a stack, we need to do insertions and deletions at one end only. We can use either end of dequ...read more

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Graph Data Structure Interview Questions

Last Updated: 10 August 2026

Graph interview questions are commonly asked to evaluate your understanding of graph representations, traversals, shortest path algorithms, and graph-based problem solving...read more

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Flipping Bits with K-Window

Last Updated: 27 July 2026

Given a binary array arr[], Find minimum number of operations to convert all 0's to 1's. In one operation, we can select a subarray of length k and flip all its bits. If ...read more

Tree data Structures Interview Questions

Last Updated: 10 August 2026

Trees are one of the most important data structures in computer science and are frequently asked about in technical interviews. A strong understanding of tree concepts, tr...read more

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Commonly Asked Data Structure Interview Questions on Strings

Last Updated: 23 July 2025

Strings are essential data structures used to represent sequences of characters and are frequently encountered in coding interviews. Questions often focus on string manipu...read more

Data Structures

Hashing Interview Questions

Last Updated: 07 August 2026

Hashing interview questions are commonly asked to evaluate your understanding of hash tables, hashing techniques, collision handling, and efficient problem-solving. This c...read more

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Heap Data Structure Interview Questions

Last Updated: 07 August 2026

Heap data structure interview questions are commonly asked to assess your understanding of heap operations, priority queues, heap sort, and related algorithms. This collec...read more

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Queue Interview Questions

Last Updated: 10 August 2026

Queue is one of the most fundamental linear data structures and is frequently tested in technical interviews due to its wide range of practical applications. Understanding...read more

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Stack Interview Questions

Last Updated: 10 August 2026

Stack interview questions are commonly asked to assess your understanding of the LIFO principle, stack operations, and problem-solving techniques. This collection covers t...read more

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Linked List Interview Questions

Last Updated: 10 August 2026

Linked List interview questions are commonly asked to assess your understanding of data structures, pointers, and problem-solving techniques. This collection covers the mo...read more

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Array Interview Questions

Last Updated: 31 August 2026

Array interview questions are commonly asked to evaluate your understanding of array concepts, memory representation, time complexity, and problem-solving techniques. This...read more

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4sum -Complete Tutorial

Last Updated: 23 July 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

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

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