Find the Longest Common Subsequence in Java
The challenge
from Wikipedia:
The longest common subsequence (LCS) problem is the problem of finding the longest subsequence common to all sequences …
Technical Articles
In-depth guides, insights, and best practices for modern software engineering
Find First and Last Position of Element in Sorted Array 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 …
Determine if Number is a Power of Three 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 …
How to Count Binary Substrings 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 …
How to Download a CSV file using Javascript
Ever wanted to generate a CSV (comma separated values) file directly from the browser, using Javascript? Instead of going to the server..
Look no …
Read Article →Array Range between Integers 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, …
How to clone a table structure in MySQL
I have often needed to clone a table without it’s data in MySQL.
Oftentimes this has been because I have a continually growing temporary table …
Read Article →Number of Rectangles in a Grid 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 are …
Read Article →Find the Longest Vowel Substring 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 …
Read Article →Determine Unique String Characters 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 two …
Difference of Volumes of Cuboids 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 …
Sort by binary ones 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 Article →Binomial Expansion 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 …
Consecutive strings in Java
The challenge
You are given an array(list) strarr of strings and an integer k. Your task is to return the first longest string consisting of k …
Determine the Highest Scoring Word in Java
The challenge
Given a string of words, you need to find the highest scoring word.
Each letter of a word scores points according to its position in the …
Read Article →Solving Speed Control in Java
The challenge
In John’s car the GPS records every s seconds the distance travelled from an origin (distances are measured in an arbitrary but …
Calculate Miles per Gallon to Kilometers per Litre in Java
The challenge
Create an application that will display the number of kilometers per liter (output) based on the number of miles per imperial gallon …
Read Article →How to Convert an Int to a List of Ints in Python
The challenge
Given a non-negative integer, return an array / a list of the individual digits in order.
Examples:
123 => [1,2,3]
1 => [1] …Find the Greatest Common Divisor in Java
The challenge
Find the greatest common divisor of two positive integers. The integers can be large, so you need to find a clever solution.
The inputs …
Read Article →How to Create a Circular List in Python
The challenge
Create a Circular List
A circular list is of finite size, but can infititely be asked for its previous and next elements. This is …
Read Article →How to Guess the Sequence in Java
The challenge
You must guess a sequence and it has something to do with the number given.
Example
x = 16
result = [1, 10, 11, 12, 13, 14, 15, 16, 2, …Reversed sequence in Java
The challenge
Build a function that returns an array of integers from n to 1 where n>0.
Example : n=5 –> [5,4,3,2,1]
The solution in Java code …
Read Article →Count the Digit in Java
The challenge
Take an integer n (n >= 0) and a digit d (0 <= d <= 9) as an integer. Square all numbers k (0 <= k <= n) between 0 and n. …
Multiply all elements in an array in Java
The challenge
Create a function multiplyAll/multiply_all which takes an array of integers as an argument. This function must return another function, …