Largest 5 digit number in a series in Java
The challenge
In the following 6 digit number:
283910
91 is the greatest sequence of 2 consecutive digits.
In the following 10 digit number: …
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Next smaller number with the same digits in Java
The challenge
Write a function that takes a positive integer and returns the next smaller positive integer containing the same digits.
For example: …
Read Article →Count of positives / sum of negatives in Java
The challenge
Given an array of integers.
Return an array, where the first element is the count of positives numbers and the second element is sum of …
Read Article →Find the stray number in Java
The challenge
You are given an odd-length array of integers, in which all of them are the same, except for one single number.
Complete the method …
Read Article →4 By 4 Skyscrapers in Java
The challenge
In a grid of 4 by 4 squares you want to place a skyscraper in each square with only some clues:
- The height of the skyscrapers is …
How to Fix: package org.junit.jupiter.api does not exist
The problem
If you have received the package org.junit.jupiter.api deos not exist error when trying to run a JUnit Java Test with Maven, it’s …
How to Programmatically Filter ag-Grid Columns in Angular
You can easily control the column filtering in ag-Grid by using the getFilterInstance and setModel methods associated to the column you need …
Sum by Factors in Java
The challenge
Given an array of positive or negative integers
I= [i<sub>1</sub>,..,i<sub>n</sub>]
you have to produce a sorted …
Read Article →Count the divisors of a number in Java
The challenge
Count the number of divisors of a positive integer n.
Random tests go up to n = 500000.
Examples
numberOfDivisors(4) == 3 // 1, 2, 4 …My smallest code interpreter in Java
The challenge
Inspired from real-world Brainf**k, we want to create an interpreter of that language which will support the following instructions: …
Read Article →Pick peaks in Java
The challenge
Write a function that returns the positions and the values of the “peaks” (or local maxima) of a numeric array.
For example, …
Read Article →Number of trailing zeros of N in Java
The challenge
Write a program that will calculate the number of trailing zeros in a factorial of a given number.
N! = 1 * 2 * 3 * ... * N
Be careful …
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