Find the missing element between two arrays in Python
The challenge
Given two integer arrays where the second array is a shuffled duplicate of the first array with one element missing, find the missing …
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In-depth guides, insights, and best practices for modern software engineering
How to Count an Array of Boolean Values in Java
The challenge
Consider an array/list of sheep where some sheep may be missing from their place. We need a function that counts the number of sheep …
Read Article →How to Solve the Car Pooling Challenge in Java
The challenge
You are driving a vehicle that has capacity empty seats initially available for passengers. The vehicle only drives east (ie. it cannot …
How to Repeat a String in Java
The challenge
Write a function called repeat_str which repeats the given string src exactly count times.
repeatStr(6, "I") // "IIIIII" …How to Find the Smallest Integer in the Array in Java
The challenge
Given an array of integers your solution should find the smallest integer.
For example:
- Given
[34, 15, 88, 2]your solution will return …
How to Count Odd Numbers Below N using Java
The challenge
Given a number n, return the number of positive odd numbers below n, EASY!
oddCount(7) //=> 3, i.e [1, 3, 5]
oddCount(15) //=> 7, …How to get the Length of the Last Word in a String using Java
The challenge
Given a string s consists of upper/lower-case alphabets and empty space characters ' ', return the length of last word (last word means …
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 …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), …
How to zoom text by mouse wheel in IntelliJ Idea
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 Windows with CTRL+ …
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 …
Remove an Exclamation Mark from the End of String using Python
The challenge
Remove a exclamation mark from the end of string. You can assume that the input data is always a string, no need to verify it.
Examples …
Read Article →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 →Compare within Margin using Python
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 …
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 …
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