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
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
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
The Longest Common Prefix problem on Leetcode is a classic string manipulation problem. Here’s the problem statement: Problem Statement: Write a function to find the longest common prefix string amongst an array of strings.If there is no common prefix, return an empty string “”. Examples: Example 1: Example 2: Naive Solution: Compare Characters Iteratively Approach: … Read more
The “Roman to Integer” problem, Leetcode problem #13, is a classic interview question that tests your understanding of algorithms and data structures. In this problem, you’re tasked with converting a given Roman numeral string to an integer. Problem Description Roman numerals are represented by seven different symbols: For example: The challenge is to convert a … Read more
Valid Parentheses – Leetcode 20 Solution in Java Leetcode’s “Valid Parentheses” problem is one of the classic questions in coding interviews, as it tests your knowledge of stacks and string manipulation. Let’s explore this problem, its requirements, and multiple solutions to solve it efficiently. Problem Statement Given a string s containing just the characters ‘(‘, ‘)’, ‘{‘, ‘}’, ‘[‘ and ‘]’, determine if the … Read more
A palindrome number reads the same forward and backward. This problem is a classic example of simple logic-based programming and is widely used in coding interviews to test problem-solving skills and understanding of fundamental concepts. In this blog post, we’ll explore various ways to solve the Palindrome Number problem (LeetCode 9) in Java. Problem Statement … Read more
The Two Sum problem is one of the most popular algorithmic problems that is frequently asked in technical interviews. This problem tests your ability to think algorithmically and optimize for efficiency. In this article, we’ll break down the Two Sum problem, explore different approaches, and provide a complete Java solution. By the end, you’ll be … Read more