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
The Next Permutation problem (LeetCode #31) involves rearranging a sequence of numbers into its next lexicographical permutation. If the sequence is already the largest possible permutation, it should be rearranged into the smallest (sorted in ascending order). Below is a detailed breakdown of the approaches to solve this problem, from naive to optimal, with Java … Read more
The “Divide Two Integers“ problem on LeetCode challenges you to implement division between two integers without using multiplication, division, or modulus operators. The task also requires handling edge cases, such as overflow and truncation towards zero. This blog will cover all approaches, from naive to optimal, with Java implementations. Problem Description for Divide Two Integers … Read more
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
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