We say that a string contains the word hackerrank if a subsequence of its characters spell the word hackerrank. Remember that a subsequence maintains the order of characters selected from …
In a previous challenge you implemented the Insertion Sort algorithm. It is a simple sorting algorithm that works well with small or mostly sorted data. However, it takes a long …
A space explorer’s ship crashed on Mars! They send a series of SOS messages to Earth for help. Letters in some of the SOS messages are altered by cosmic radiation …
In Insertion Sort Part 1, you inserted one element into an array at its correct sorted position. Using the same approach repeatedly, can you sort an entire array? Guideline: You …
Given a string, remove characters until the string is made up of any two alternating characters. When you choose a character to remove, all instances of that character must be …
Louise joined a social networking site to stay in touch with her friends. The signup page required her to input a name and a password. However, the password must be …
Sorting One common task for computers is to sort data. For example, people might want to see all their files on a computer sorted by size. Since sorting is a …
There is a sequence of words in CamelCase as a string of letters,s, having the following properties: It is a concatenation of one or more words consisting of English letters. …
About Tutorial Challenges Many of the challenges on HackerRank are difficult and assume that you already know the relevant algorithms. These tutorial challenges are different. They break down algorithmic concepts …
Consider an array of numeric strings where each string is a positive number with anywhere from to 10^6 digits. Sort the array’s elements in non-decreasing, or ascending order of their integer values …