Even or Odd Array Sum in Java
The challenge
Given a list of numbers, determine whether the sum of its elements is odd or even.
Give your answer as a string matching "odd" …
Technical Articles
In-depth guides, insights, and best practices for modern software engineering
String Permutations in Java
The challenge
In this challenge, you have to create all permutations of an input string and remove duplicates if present. This means you have to …
Read Article →Remove a Specific Element of an Array in Java
The challenge
You will be given a certain array of length n, such that n > 4, having positive and negative integers but there will be no zeroes and …
Upside down numbers in Java
The challenge
Consider the numbers 6969 and 9116. When you rotate them 180 degrees (upside down), these numbers remain the same. To clarify, if we …
Rotate matrix counter-clockwise N times in Java
The challenge
In this challenge your mission is to rotate matrix counter-clockwise N times.
So, you will have 2 inputs:
1) matrix
2) a number, how …Unable to import module “lambda_function”: No module named “pymysql”
If you receive the following error message when trying to run pymysql on AWS Lambda:
Unable to import module "lambda_function": No module …
Square Matrix Multiplication in Java
The challenge
Write a function that accepts two square (NxN) matrices (two dimensional arrays), and returns the product of the two. Only square …
Count the divisible numbers in Java
The challenge
Complete the function that takes 3 numbers x, y and k (where x ≤ y), and returns the number of integers within the range [x..y] (both …
Averages of numbers in Java
The challenge
Get the averages of these numbers
Write a method, that gets an array of integer-numbers and return an array of the averages of each …
Read Article →Decimal to Factorial and Back in Java
The challenge
Coding decimal numbers with factorials is a way of writing out numbers in a base system that depends on factorials, rather than powers …
Read Article →Vowel Count in Java
The challenge
Return the number (count) of vowels in the given string.
We will consider a, e, i, o, u as vowels for this challenge (but not y).
The …
Read Article →Equal Sides Of An Array in Java
The challenge
You are going to be given an array of integers. Your job is to take that array and find an index N where the sum of the integers to the …
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