How to Rotate a Singly Linked List in 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:
Read Article →Technical Articles
In-depth guides, insights, and best practices for modern software engineering
How to Insert into a Binary Search Tree using 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
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
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
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 …
Read Article →How to Calculate all Unique Combinations of a Target using Backtracking in Java
The challenge
Given an array of distinct integers candidates and a target integer target, return a list of all unique combinations of candidates where …
Who is going to pay for the wall? in Python
The challenge
Don Drumphet lives in a nice neighborhood, but one of his neighbors has started to let his house go. Don Drumphet wants to build a wall …
Read Article →Calculate the Total Amount of Points using Java
The challenge
Our football team finished the championship. The result of each match look like “x:y”. Results of all matches are recorded …
Read Article →Calculate the biggest of 3 numbers using Java
The challenge
Task
- Given three integers
a,b,c, return the largest number obtained after inserting the following operators and brackets:+,*,() - In …
Find the missing element between two arrays in Python
The challenge
Given two integer arrays where the second array is a shuffled duplicate of the first array with one element missing, find the missing …
Read Article →How to Count an Array of Boolean Values in Java
The challenge
Consider an array/list of sheep where some sheep may be missing from their place. We need a function that counts the number of sheep …
Read Article →How to Solve the Car Pooling Challenge in Java
The challenge
You are driving a vehicle that has capacity empty seats initially available for passengers. The vehicle only drives east (ie. it cannot …