The challenge Given a random non-negative number, you have to return the digits of this number within an array in reverse order. Test cases Solution… Read More »How to Convert a Number to Reversed Array of Digits in Java
The challenge On a 2-dimensional grid, there are 4 types of squares: 1 represents the starting square. There is exactly one starting square. 2 represents the ending square. … Read More »How to Solve Unique Paths III in Java
The challenge Find the mean (average) of a list of numbers in an array. To find the mean (average) of a set of numbers add… Read More »How to Find the Mean/Average of a List of Numbers in Java
The challenge BMI stands for Body Mass Index and is a value derived from the mass and height of a person. The BMI is defined… Read More »How to Calculate BMI in Java
The challenge On an infinite plane, a robot initially stands at (0, 0) and faces north. The robot can receive one of three instructions: “G”: go straight 1 unit;… Read More »How to Solve the Robot Bounded In Circle Challenge in Java
The challenge We need a function that can transform a string into a number. What ways of achieving this do you know? Note: Don’t worry,… Read More »How to Convert a String to a Number in Java
The challenge Given a non-negative integer n, write a function toBinary/ToBinary which returns that number in a binary format. Test cases The solution in Java Alternative 1: Alternative… Read More »How to Convert an Integer to Binary using Java
Exclusive “or” (xor) Logical Operator In some scripting languages like PHP, there exists a logical operator (e.g. &&, ||, and, or, etc.) called the “Exclusive Or” (hence the name… Read More »How to create a Logical Operator in Java
The challenge Write a function that merges two sorted arrays into a single one. The arrays only contain integers. Also, the final outcome must be… Read More »How to merge sorted integer arrays (without duplicates) in Java
The challenge Your job is to find the gravitational force between two spherical objects (obj1 , obj2). Two arrays are give : arr_val (value array),… Read More »Find the Force of Gravity Between Two Objects with Java
It’s a common requirement to be able to zoom in or out while working in the code editor in IntelliJ Idea. This is achieved on… Read More »How to zoom text by mouse wheel in IntelliJ Idea
The challenge You are playing the following Bulls and Cows game with your friend: You write down a number and ask your friend to guess what the… Read More »Playing the Bulls and Cows Game in Java
The challenge Given a binary tree, each node has value 0 or 1. Each root-to-leaf path represents a binary number starting with the most significant bit. For example,… Read More »Calculate the Sum of Root To Leaf Binary Numbers in Java
The challenge Remove a exclamation mark from the end of string. For a beginner kata, you can assume that the input data is always a… Read More »Remove an Exclamation Mark from the End of String using Python
The challenge Let’s play Rock Paper Scissors! You have to return which player won! In case of a draw return Draw!. Examples: The rules of the… Read More »How to “Rock Paper Scissors” in Java
The challenge Create a function close_compare that accepts 3 parameters: a, b, and an optional margin. The function should return whether a is lower than, close to, or higher than b. a is “close to” b if margin is… Read More »Compare within Margin using Python
The challenge It’s the academic year’s end, fateful moment of your school report. The averages must be calculated. All the students come to you and… Read More »Get the mean of an array in Java
The challenge You’re re-designing a blog and the blog’s posts have the following format for showing the date and time a post was made: Weekday Month Day, time e.g.,… Read More »Remove the time challenge in Python
The challenge Write a function that converts an input string contains a hex value, and return a decimal. Test cases The solution in Java In… Read More »How to Convert Hex to Decimal in Java
The challenge For a given string s find the character c (or C) with longest consecutive repetition and return: where l (or L) is the length of the repetition. If there are two… Read More »Character with Longest Consecutive Repetition in Java
The challenge Create a method that accepts a list and an item, and returns true if the item belongs to the list, otherwise false. Test cases The solution… Read More »Check if List contains Item in Python
How to create a user How to delete a user How to grant permissions How to apply those permissions Going a bit deeper Different types… Read More »How To Create a User and Grant Permissions in MySQL
The challenge Create a function called shortcut to remove all the lowercase vowels in a given string. Examples Don’t worry about uppercase vowels. Test cases The solution in Python… Read More »How to Remove Vowels with Python
I needed to find all files in a directory on Linux that ended with the file extension .php. How to find all files in a… Read More »How to find all files in a directory with extension
In this tutorial, you will learn how to sort a list in Python, by following the below three steps: Options to sort a list in… Read More »How to Sort a List in Python