How to Compute a Cube as Sums in Golang
The challenge
You will be given a number n (where n >= 1) and your task is to find n consecutive odd numbers whose sum is exactly the cube of n. …
Technical Articles
In-depth guides, insights, and best practices for modern software engineering
The Deaf Rats of Hamelin Challenge in Java
The challenge
The Pied Piper has been enlisted to play his magical tune and coax all the rats out of town.
But some of the rats are deaf and are going …
Read Article →How to Find the Next Perfect Square in Java
The challenge
You might know some pretty large perfect squares. But what about the NEXT one?
Complete the findNextSquare method that finds the next …
How to Find the Unique String in Python
The challenge
There is an array of strings. All strings contain similar letters except one. Try to find it!
find_uniq([ 'Aa', 'aaa', …How to convert a PascalCase string into snake_case in Python
The challenge
Complete the function/method so that it takes a PascalCase string and returns the string in snake_case notation. Lowercase characters …
How to Convert a Hex String to RGB in Python
The challenge
When working with color values it can sometimes be useful to extract the individual red, green, and blue (RGB) component values for a …
Read Article →How to Create a Hashtag Generator in Python
The challenge
Write a hashtag generator function that takes a string and returns a #HashCodeString of it.
The hashtag generator should perform the …
Read Article →How to Move Zeros to the End in Python
The challenge
Write an algorithm that takes an array and moves all of the zeros to the end, preserving the order of the other elements.
move_zeros([1, …Regex for Gregorian Date Validation in Python
The challenge
Write a regular expression that validates the gregorian date in the format “DD.MM.YYYY”
Correct date examples: …
Read Article →How to Create Your Own Python Split Function
The challenge
Write your own implementation of the built-in split function in Python.
The following rules must be adhered to:
- the function cannot …
How to create a Domain Name Validator in Python
The challenge
Create a domain name validator mostly compliant with RFC 1035, RFC 1123, and RFC 2181
The following rules apply:
- Domain name may …
How to start Java Jar as Service on Linux
If you have a Java Jar file, you can run it as a service under Linux/Ubuntu.
sudo ln -s /var/www/japi-0.0.1-SNAPSHOT.jar /etc/init.d/japi
Now you can …
Read Article →How to write a validDate Regex in Python
The challenge
Your task is to write a regular expression (regex) that will match a string only if it contains at least one valid date, in the format …
Read Article →How to Validate Passwords with Regex in Python
The challenge
You need to write regex that will validate a password to make sure it meets the following criteria:
- At least six characters long …
How to create a Coordinates Validator in Golang
The challenge
You need to create a function that will validate if given parameters are valid geographical coordinates.
Valid coordinates look like the …
Read Article →How to Validate ISBN-10 numbers in Golang
The challenge
ISBN-10 identifiers are ten digits long. The first nine characters are digits 0-9. The last digit can be 0-9 or X, to indicate a value …
How to Create a Java GUI App that shows the Logged-in User and Hostname
Create a new file called Application.java and paste the following:
import javax.swing.*;
import java.net.InetAddress;
import …How to view a Terraform Module’s Output
An output in Terraform is a way to view the result of an action that has been performed, or resource that has been created.
Let’s say that you …
Read Article →How to Count the Characters in Python
The challenge
The goal of this challenge is to write a function that takes two inputs: a string and a character. The function will count the number of …
Read Article →How to Install Cuda driver for Nvidia on Ubuntu
If you have just upgraded Ubuntu on your AWS g4dn instance and need to install/reinstall Cuda drivers for your Nvidia chipset, then you can run the …
Read Article →How to List all Running Services on Ubuntu
If you need to view a list of all the services that are either running or stopped (or both) on an Ubuntu server, then you can use the following …
Read Article →[Solved] conflict: unable to remove repository reference in Docker
If you get the following error while trying to delete an image in Docker:
Error response from daemon: conflict: unable to remove repository reference …
How to Upgrade an Ubuntu Server
Upgrading an Ubuntu Server is quite easy, just follow the below commands:
Option 1: Tldr; (just run the below!)
sudo apt-get update && sudo …How to Solve Two-Sum in Java
The challenge
Write a function that takes an array of numbers (integers for the tests) and a target number. It should find two different items in the …
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