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
The 4Sum problem is a variation of the classic two-sum problem. The task is to find all unique quadruplets in an array that sum up to a target value. This problem is often encountered in coding interviews and algorithm competitions. In this blog post, we will discuss various solutions for the 4Sum problem, ranging from … Read more
The “Letter Combinations of a Phone Number“ problem is a classic question often asked in technical interviews. It challenges your understanding of backtracking, recursion, and efficient problem-solving. Let’s explore all possible solutions, from a naive approach to an optimized one, with their explanations, complexities, and Java implementations. Problem Statement for Letter Combinations of a Phone … Read more
The 3Sum Closest problem from Leetcode is a popular algorithmic challenge that tests your understanding of array manipulation and optimization techniques. In this article, we’ll cover the problem statement, a step-by-step approach to solving it, and explain multiple solutions from naive to optimized with their complexities. We’ll also provide well-commented Java code for each solution. … Read more
The 3Sum problem is a popular coding challenge on LeetCode that tests your ability to implement efficient algorithms for finding combinations. This blog will walk you through various approaches, from the brute force method to optimized solutions, with complete explanations, time complexities, and Java implementations. Problem Statement 3Sum: Given an integer array nums, return all … Read more
Converting an integer to a Roman numeral is a common problem in coding interviews and algorithm challenges. In this blog post, we will explore the Leetcode 12: Integer to Roman problem, explain various approaches, and provide Java code solutions for each method. Problem Statement for Integer to Roman Given an integer num, convert it into … Read more
The LeetCode problem String to Integer (atoi) is a common question that challenges your ability to handle input conversion and edge cases. In this post, we’ll dive into the problem, break down the requirements, and walk through different solutions in Java. Problem Statement Implement the myAtoi(string s) function, which converts a string to a 32-bit signed integer. … Read more
Introduction The Reverse Integer problem is a classic LeetCode challenge, categorized as an Easy level problem, but it’s a great exercise in understanding integer manipulation and overflow handling. This problem is frequently asked in coding interviews, making it a must-practice for aspiring developers. In this blog post, we’ll break down the problem, explore different solution … Read more
Introduction The Longest Palindromic Substring is a classic problem that tests your understanding of strings, dynamic programming, and optimization techniques. A palindrome reads the same forward and backward, and the problem asks for the longest contiguous palindromic substring in a given string. This post will explore various approaches to solve Longest Palindromic Substring Leetcode problem, … Read more
Finding the median of two sorted arrays is a classic problem in computer science and competitive programming. It is particularly interesting due to its constraints, which encourage an efficient solution rather than a simple brute-force approach. In this article, we’ll cover different methods to solve this problem, including their pros and cons, and provide Java … Read more