How to Solve the “To square(root) or not to square(root)” Challenge in Java
The challenge
Write a method, that will get an integer array as parameter and will process every number from this array.
Return a new array with …
Technical Articles
In-depth guides, insights, and best practices for modern software engineering
Solving the Rule of Divisibility by 13 in Java
The challenge
wikipedia.com
When you divide the successive powers of 10 by 13 you get the following remainders of the integer divisions:
1, 10, 9, …
How to Calculate Buddy Strings in Java
The challenge
Given two strings A and B of lowercase letters, return true if you can swap two letters in A so the result is equal to B, otherwise, …
How to Flip a Binary Matrix in Java
The challenge
Given a binary matrix A, we want to flip the image horizontally, then invert it, and return the resulting image.
To flip an image …
Read Article →How to Tilt a Binary Tree in Java
The challenge
Given the root of a binary tree, return the sum of every tree node’s tilt.
The tilt of a tree node is the absolute difference …
Read Article →How to solve the House Robber Challenge in Java
The challenge
You are a professional robber planning to rob houses along a street. Each house has a certain amount of money stashed, the only …
Read Article →How to Solve the Bag of Tokens Challenge in Java
The challenge
You have an initial power of P, an initial score of ``, and a bag of tokens where tokens[i] is the value of the …
How to Find the Smallest Divisor Given a Threshold in Java
The challenge
Given an array of integers nums and an integer threshold, we will choose a positive integer divisor and divide all the array by it and …
How to Sort and Star a String Array in Java
The challenge
You will be given a vector of strings. You must sort it alphabetically (case-sensitive, and based on the ASCII values of the chars) and …
Read Article →How to Count Consecutive Characters in Java
The challenge
Given a string s, the power of the string is the maximum length of a non-empty substring that contains only one unique character.
Return …
Read Article →How to Abbreviate a Two Word Name in Java
The challenge
Write a function to convert a name into initials. This challenge strictly takes two words with one space in between them.
The output …
Read Article →How to Sort a Linked List using Insertion Sort in Java
The challenge
Sort a linked list using insertion sort.
A graphical example of insertion sort. The partially sorted list (black) initially contains …
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