Andrew

The challenge You are given an array of unique elements, and your task is to rearrange the values so that the first max value is… Read More »How to Solve Max-Min Arrays in Java

The challenge The most basic encryption method is to map a char to another char by a certain math rule. Because every char has an… Read More »How to do Basic Encryption in Java

The challenge Complete the function that takes an odd integer (0 < n < 1000000) which is the difference between two consecutive perfect squares, and… Read More »How to Find the Squares in Java

The challenge When given a string of space-separated words, return the word with the longest length. If there are multiple words with the longest length,… Read More »How to Get Longest Word in Sentence in Java

The challenge You must implement a function that returns the difference between the biggest and the smallest value in a list(lst) received as a parameter.… Read More »Maximum Different of Int-Array in Java

The challenge Given a string and an array of integers representing indices, capitalize all letters at the given indices. Example: capitalize(“abcdef”,[1,2,5]) = “aBCdeF” capitalize(“abcdef”,[1,2,5,100]) =… Read More »Indexed Capitalization in Java

The challenge Modify the spacify function so that it returns the given string with spaces inserted between each character. The solution in Java code Option… Read More »How to Spacify a String in Java

The challenge Write a simple regex to validate a username. Allowed characters are: lowercase letters, numbers, underscore Length should be between 4 and 16 characters… Read More »How to Validate Usernames with Regex 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 strings of a2. Example 1: a1 =… Read More »Sort Lexicographical Order of Substrings 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… Read More »How to Perform Alphabetical Addition 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 separated words.… Read More »How to Encrypt Words in Java