The challenge Write a function which maps a function over the lists in a list: Example 1: Example 2: The solution in Java code Option… Read More »How to Map over a List of Lists in Java

The challenge Create a function that differentiates a polynomial for a given value of x. Your function will receive 2 arguments: a polynomial as a string,… Read More »How to Differentiate a Polynomial in Java

The challenge The task is simply stated. Given an integer n (3 < n < 109), find the length of the smallest list of perfect squares which add up… Read More »Find the Sums of Perfect Squares in Java

The challenge Your task, is to create a NxN spiral with a given size. For example, spiral with size 5 should look like this: 00000 ….0… Read More »How to Make a Spiral in Java

The challenge from Wikipedia:The longest common subsequence (LCS) problem is the problem of finding the longest subsequence common to all sequences in a set of sequences.It… Read More »Find the Longest Common Subsequence in Java

The challenge Given an array of integers nums sorted in ascending order, find the starting and ending position of a given target value. If target is not found in the array,… Read More »Find First and Last Position of Element in Sorted Array in Java

The challenge Given an integer n, return true if it is a power of three. Otherwise, return false. An integer n is a power of three, if there exists an integer x such… Read More »Determine if Number is a Power of Three in Java

The challenge Give a string s, count the number of non-empty (contiguous) substrings that have the same number of 0’s and 1’s, and all the 0’s… Read More »How to Count Binary Substrings in Java

The challenge Complete the function that takes two integers (a, b, where a < b) and return an array of all integers between the input parameters, including them.… Read More »Array Range between Integers in Java

The challenge Given a grid of size m x n, calculate the total number of rectangles contained in this rectangle. All integer sizes and positions… Read More »Number of Rectangles in a Grid in Java

The challenge The vowel substrings in the word codewarriors are o,e,a,io. The longest of these has a length of 2. Given a lowercase string that has alphabetic characters… Read More »Longest vowel chain in Java

The challenge In this challenge, you will be given two strings a and b and your task will be to return the characters that are not common in the… Read More »Determine Unique String Characters in Java

The challenge In this simple exercise, you will create a program that will take two lists of integers, a and b. Each list will consist of 3 positive… Read More »Difference of Volumes of Cuboids in Java

The challenge In this example you need to implement a function that sort a list of integers based on it’s binary representation. The rules are… Read More »Sort by binary ones in Java

The challenge Write a program that can do some algebra. Write a function expand that takes in an expression with a single, one character variable, and expands… Read More »Binomial Expansion in Java