Search in Rotated Sorted Array | Leetcode 33 Solution

Searching for an element in a rotated sorted array is a common coding problem that can appear in technical interviews. It combines concepts of array manipulation and binary search, making it an essential topic to master. In this blog post, we will explore solutions for Search in Rotated Sorted Array from naive to optimal, providing … Read more

Remove Element-Leetcode 27 Solution

The Remove Element problem is a classic LeetCode challenge. The task is to remove all occurrences of a specified value (val) from an integer array nums in-place and return the count of the remaining elements. Here’s a comprehensive guide to solving the problem, covering all approaches from naive to optimal. Problem Statement Given an integer … Read more

Remove Duplicates From Sorted Array-Leetcode 26 Solution

The “Remove Duplicates from Sorted Array” problem is a classic exercise on LeetCode that tests your ability to manipulate arrays efficiently. The task involves removing duplicate elements from a sorted array and returning the length of the modified array without using extra space for another array. This guide explores multiple approaches, from naive to optimal, … Read more

Count Inversions of an Array

Counting inversions in an array is a fundamental problem in computer science and programming interviews. This guide will explain what array inversions are, the significance of solving this problem, and different approaches to count inversions of an array in Java. What are Inversions in an Array? An inversion in an array is a pair of … Read more

Swap Nodes in Pairs – LeetCode 24 Solution

If you’re a LeetCode enthusiast or just starting out, you might have encountered the problem Swap Nodes in Pairs (LeetCode 24). This is a classic problem that involves swapping adjacent nodes in a linked list. Understanding how to solve this problem is crucial for mastering linked list manipulation and performing well in coding interviews. In … Read more

Merge Two Sorted Lists | Leetcode 21 Solution

Merge Two Sorted Lists - Leetcode 21 Solution

Introduction The “Merge Two Sorted Lists” problem (Leetcode 21) is a classic algorithmic challenge that tests your understanding of linked lists and pointers. The goal is to merge two sorted linked lists into a single sorted linked list. In this blog post, we will explore multiple solutions to this problem, ranging from a naive approach … Read more

Valid Parentheses | Leetcode 20 Solution

Valid Parentheses - Leetcode 20 Solution

Introduction to Valid Parentheses The “Valid Parentheses” problem (Leetcode 20) is a popular question often asked in coding interviews. The task is to check if a given string containing just the characters ‘(‘, ‘)’, ‘{‘, ‘}’, ‘[‘ and ‘]’ is valid. An input string is valid if the brackets are correctly closed and nested. In … Read more

Remove Nth Node from End of List | Leetcode 19 Solution

Problem Description Given a linked list, remove nth node from end of list and return its head. The list can have various sizes, and the node we need to remove can be anywhere from the beginning to the end of the list. Approach To solve this problem efficiently, we need to think about how to … Read more

How to Implement a Queue Using Arrays

Introduction Queues are a fundamental data structure in computer science, often used in various applications such as scheduling processes and managing tasks. In this guide, you will learn how to implement a queue using arrays in Java. By the end of this article, you’ll understand how queues work, their core operations, and how to code … Read more

How to Implement a Queue Using Linked List

Introduction Queues are an essential data structure in computer science, and they can be implemented in various ways. In this guide, we will focus on how to implement a queue using a linked list in Java. By the end of this article, you’ll understand the fundamentals of a queue, how linked lists work, and how … Read more