How to Find the Last Digit of a Huge Number in Golang
The challenge
For a given list [x1, x2, x3, ..., xn] compute the last (decimal) digit of x1 ^ (x2 ^ (x3 ^ (... ^ xn))).
Example:
last_digit({3, 4, 2}, …Technical Articles
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Find the Maximum Length Difference between Lists/Arrays in Python
The challenge
You are given two arrays a1 and a2 of strings. Each string is composed of letters from a to z. Let x be any string in the first array …
How to Circularly Sort an Array in Golang
The challenge
An array is circularly sorted if the elements are sorted in ascending order but displaced, or rotated, by any number of steps.
Complete …
Read Article →Largest Number Groupings in String in Python
The challenge
You are be given a string that has lowercase letters and numbers. Your task is to compare the number groupings and return the largest …
Read Article →How to Alternate String Casing in Golang
The challenge
Write a function toWeirdCase (weirdcase in Ruby) that accepts a string, and returns the same string with all even indexed characters in …
How to Sort a List of Numbers in Python
The challenge
Finish the solution so that it sorts the passed-in array/list of numbers. If the function passes in an empty array/list or null/None …
Read Article →How to Validate Usernames with Regex in Java
The challenge
Write a simple regex to validate a username. Allowed characters are:
- lowercase letters,
- numbers,
- underscore
Length should be between 4 …
Read Article →Sort Lexicographical Order of Substrings in Java
The challenge
Given two arrays of strings a1 and a2 return a sorted array r in lexicographical order of the strings of a1 which are substrings of …
How to Perform Alphabetical Addition in Java
The challenge
Your task is to add up letters to one letter.
The function will be given an array of single-character Strings, each one being a letter …
Read Article →Roman Numerals Decoder in Golang
The challenge
Create a function that takes a Roman numeral as its argument and returns its value as a numeric decimal integer. You don’t need to …
Read Article →How to Subtract from Time in Golang
The challenge
Clock shows h hours, m minutes and s seconds after midnight.
Your task is to write a function that returns the time since midnight in …
Read Article →How to Encrypt Words in Java
The challenge
You want to create secret messages which must be deciphered.
Here are the conditions:
- Your message is a string containing space …