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 …
Java
342 articles about java development, tools, and best practices
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 …
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 …
How to Repeat a String in Java
The challenge
Write a function called repeat_str which repeats the given string src exactly count times.
repeatStr(6, "I") // "IIIIII" …How to Find the Smallest Integer in the Array in Java
The challenge
Given an array of integers your solution should find the smallest integer.
For example:
- Given
[34, 15, 88, 2]your solution will return …
How to Count Odd Numbers Below N using Java
The challenge
Given a number n, return the number of positive odd numbers below n, EASY!
oddCount(7) //=> 3, i.e [1, 3, 5]
oddCount(15) //=> 7, …How to get the Length of the Last Word in a String using Java
The challenge
Given a string s consists of upper/lower-case alphabets and empty space characters ' ', return the length of last word (last word means …
How to Convert a Number to Reversed Array of Digits in Java
The challenge
Given a random non-negative number, you have to return the digits of this number within an array in reverse order.
Test cases
import …How to Solve Unique Paths III in Java
The challenge
On a 2-dimensional grid, there are 4 types of squares:
1represents the starting square. There is exactly one starting square.2 …
How to Find the Mean/Average of a List of Numbers in Java
The challenge
Find the mean (average) of a list of numbers in an array.
To find the mean (average) of a set of numbers add all of the numbers together …
Read Article →