Java

int32 to IPv4 in Java

February 18, 2021 #Java

The challenge

Take the following IPv4 address: 128.32.10.1

This address has 4 octets where each octet is a single byte (or 8 bits).

• 1st octet 128 has …

Perimeter of squares in a rectangle in Java

February 17, 2021 #Java

The challenge

The drawing shows 6 squares the sides of which have a length of 1, 1, 2, 3, 5, 8. It’s easy to see that the sum of the perimeters …

Palindrome chain length in Java

February 16, 2021 #Java

The challenge

Number is a palindrome if it is equal to the number with digits in reversed order. For example, 5, 44, 171, 4884 are palindromes, and 43 …

String array duplicates in Java

February 15, 2021 #Java

The challenge

You are given an array of strings and your task is to remove all consecutive duplicate letters from each string in the array.

For …

Even or Odd Array Sum in Java

February 14, 2021 #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" …

String Permutations in Java

February 13, 2021 #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 …

Remove a Specific Element of an Array in Java

February 12, 2021 #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

February 11, 2021 #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

February 10, 2021 #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 …

Square Matrix Multiplication in Java

February 8, 2021 #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

February 7, 2021 #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

February 6, 2021 #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 …