Java

Calculate the Surface Area and Volume of a Box with Java

October 16, 2020 #Java

The challenge

Write a function that returns the total surface area and volume of a box as an array: [area, volume]

The solution in Java

We know that …

Find Numbers which are Divisible by given Number in Java

October 15, 2020 #Java

The challenge

Complete the function which takes two arguments and returns all numbers which are divisible by the given divisor. First argument is an …

Get the Maximum XOR of Two Numbers in an Array in Java

October 13, 2020 #Java

The challenge

Given a non-empty array of numbers, a, a1, a2, … , an-1, where 0 ≤ ai < 231.

Find the maximum result of ai XOR aj, where 0 ≤ i, j …

How to Get the Opposite of a Number in Java

October 12, 2020 #Java

The challenge

Given a number, find its opposite.

Examples:

1: -1
14: -14
-34: 34

The solution in Java

We return the number itself multiplied by a …

How to Find the Area or Perimeter of a 4-sided Polygon using Java

October 11, 2020 #Java

The challenge

You are given the length and width of a 4-sided polygon. The polygon can either be a rectangle or a square.
If it is a square, return …

How to Parse Int from Char in Java

October 10, 2020 #Java

The challenge

We take in a String where the first place contains a number, write a function that takes in this String and returns an int containing …

How to Search a Binary Tree in Java

October 9, 2020 #Java

The challenge

Given a sorted (in ascending order) integer array nums of n elements and a target value, write a function to search target in nums. If …

How to Rotate a Singly Linked List in Java

October 8, 2020 #Java

The challenge

Given a linked list, rotate the list to the right by k places, where k is non-negative.

Example 1:

Example 2:

How to Insert into a Binary Search Tree using Java

October 7, 2020 #Java

The challenge

You are given the root node of a binary search tree (BST) and a value to insert into the tree. Return the root node of the BST after the …

Find the Complement of Base 10 Integer in Java

October 6, 2020 #Java

The challenge

Every non-negative integer N has a binary representation.  For example, 5 can be represented as "101" in binary, 11 as …

Solve the Number of Recent Calls Challenge in Java

October 5, 2020 #Java

The challenge

You have a RecentCounter class which counts the number of recent requests within a certain time frame.

Implement the RecentCounter …

How to Calculate the Summation of a Number in Java

October 4, 2020 #Java

The challenge

Write a program that finds the summation of every number from 1 to num. The number will always be a positive integer greater than 0.

For …