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An anagram is a word or phrase that is formed by rearranging the letters of another word or phrase. For example, “listen” is an anagram of “silent”. How to Check if Two Strings are Anagrams in Java In this program, we will create a method that checks if two given Read more…

Sure! Let’s expand on the blog post by including multiple solutions for checking the equality of two arrays in Java. Below, I’ll present three different methods: How Do You Check the Equality of Two Arrays in Java? In Java, checking the equality of two arrays can be performed using various Read more…

One of the common interview questions asked at MAANG companies is how to find duplicate characters in a string. In this post, we will walk through various approaches, from basic to optimized, to tackle this problem. Problem Statement Given a string, find all the duplicate characters and their frequencies. Input Read more…

In Java, you can remove all white spaces from a string by using the replaceAll() method with a regular expression or by manually iterating through the string and omitting the spaces. Here are a couple of ways to achieve this: 1. Using replaceAll() with a Regular Expression The simplest and Read more…

Creating a pyramid of numbers in Java is a common task often used to practice loops and nested loops. The pyramid pattern typically consists of numbers arranged in rows with increasing size, making it look like a pyramid. Below is the code to create a pyramid of numbers, along with Read more…

Reversing a string is one of the most common tasks in programming, and there are various ways to achieve this in Java. Let’s explore some of the simplest and most efficient methods to reverse a string. Method 1: Using StringBuilder The StringBuilder class provides a method called reverse() which makes Read more…

Problem Statement: Given an array of strings, your task is to find the longest common prefix string amongst the array. If there is no common prefix, return an empty string. Example: Input: Output: Approach to the Problem: We can solve this problem using a simple vertical scanning approach: This approach Read more…

Problem Statement: Given an array of size n, your task is to find the majority element, which is defined as the element that appears more than ⌊n/2⌋ times. It is guaranteed that the array is non-empty and the majority element always exists. Example: Input: Output: Approach to the Problem: To Read more…

Problem Statement: Design a stack that supports the following operations: All operations should be performed in constant time, O(1). Example: Input: Output: Approach to the Problem: To efficiently implement the Min Stack, we will use two stacks: This allows us to retrieve the minimum element in constant time while supporting Read more…

Problem Statement: A peak element in an array is defined as an element that is greater than its neighbors. Given an input array where nums[i] != nums[i + 1], your task is to find a peak element and return its index. The array may contain multiple peaks, and returning the Read more…