How to Convert a Number to Reversed Array of Digits in Java
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
import …Java
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How to Solve Unique Paths III in Java
The challenge
On a 2-dimensional grid, there are 4 types of squares:
1represents the starting square. There is exactly one starting square.2 …
How to Find the Mean/Average of a List of Numbers 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 all of the numbers together …
Read Article →How to Calculate BMI 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 as the body mass divided …
How to Solve the Robot Bounded In Circle Challenge 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: …
How to Convert a String to a Number 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, all …
Read Article →How to Convert an Integer to Binary using Java
The challenge
Given a non-negative integer n, write a function toBinary/ToBinary which returns that number in a binary format.
to_binary(1) /* should …How to create a Logical Operator in Java
Exclusive “or” (xor) Logical Operator
In some scripting languages like PHP, there exists a logical operator (e.g. &&, ||, and, or, …
How to merge sorted integer arrays (without duplicates) 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 Article →Find the Force of Gravity Between Two Objects with 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), …
Playing the Bulls and Cows Game in Java
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 number …
Read Article →Calculate the Sum of Root To Leaf Binary Numbers in Java
The challenge
Given a binary tree, each node has value `` or 1. Each root-to-leaf path represents a binary number starting with the most significant …
How to “Rock Paper Scissors” in Java
The challenge
Let’s play Rock Paper Scissors! You have to return which player won! In case of a draw return Draw!.
Examples: …
Read Article →Get the mean of an array in Java
The challenge
It’s the academic year’s end, fateful moment of your school report. The averages must be calculated. All the students come …
Read Article →How to Convert Hex to Decimal in Java
The challenge
Write a function that converts an input string contains a hex value, and return a decimal.
Test cases
import org.junit.Test;
import …Character with Longest Consecutive Repetition in Java
The challenge
For a given string s find the character c (or C) with longest consecutive repetition and return:
Object[]{c, l};
where l (or L) is the …
Cryptanalysis Word Patterns in Java
The challenge
In cryptanalysis, words patterns can be a useful tool in cracking simple ciphers.
A word pattern is a description of the patterns of …
Read Article →Backspaces in String Challenge using Java
The challenge
Assume "#" is like a backspace in string. This means that string "a#bc#d" actually is "bd"
Your task is to …
Read Article →The SongDecoder Dubstep Challenge with Java
The challenge
Polycarpus works as a DJ in the best Berland nightclub, and he often uses dubstep music in his performance. Recently, he has decided to …
Read Article →Break camelCase Challenge in Java
The challenge
Complete the solution so that the function will break up camel casing, using a space between words.
Example …
Read Article →The “Split Strings” Challenge using Java
The challenge
Complete the solution so that it splits the string into pairs of two characters. If the string contains an odd number of characters then …
Read Article →Solving the “Double Cola” Challenge using Java
The challenge
Sheldon, Leonard, Penny, Rajesh and Howard are in the queue for a “Double Cola” drink vending machine; there are no other …
Read Article →Convert Seconds to Human Readable Time (HH:MM:SS) using Java
The challenge
Write a function, which takes a non-negative integer (seconds) as input and returns the time in a human-readable format (HH:MM:SS)
HH= …
Solving the “Mexican Wave” Challenge using Java
The challenge
Task
Your task is to create a function that turns a string into a Mexican Wave. You will be passed a string and you must return that …
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