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 Longest Valid Parentheses Leetcode problem is a classic string problem that tests your ability to work with parentheses and logic structures. Here’s the problem statement: Given a string containing just the characters ‘(‘ and ‘)’, find the length of the longest valid (well-formed) parentheses substring. This blog post will walk you through several approaches … 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
LeetCode problem 28, “Find the Index of the First Occurrence in a String“, asks us to locate the first index of a given substring (needle) in another string (haystack). If the substring is not found, we return -1. This is a classic problem in string searching with multiple approaches ranging from basic brute force to … Read more
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
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
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
The LeetCode 23 problem, “Merge K Sorted Lists,” is a classic example that tests your ability to implement optimized algorithms for merging lists. Let’s explore the problem statement, analyze its solutions, and discuss their time and space complexities. Problem Statement for Merge K Sorted Lists You are given an array of k linked lists, where … Read more
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