[Solved] Fatal: refusing to merge unrelated histories in Git
You have received the dreaded fatal: refusing to merge unrelated histories error!
You might find yourself asking one of the following questions:
- What …
Technical Articles
In-depth guides, insights, and best practices for modern software engineering
Credit Card Mask in Java
The challenge
Usually when you buy something, you’re asked whether your credit card number, phone number or answer to your most secret question …
Read Article →How to Reverse a Number in Java
The challenge
Given a number, write a function to output its reverse digits. (e.g. given 123 the answer is 321)
Numbers should preserve their sign; …
Read Article →Positions Average in Java
The challenge
Suppose you have 4 numbers: '0', '9', '6', '4' and 3 strings composed with them:
s1 = "6900690040"
s2 = "4690606946"
s3 …Determine the Date by the Day Number in Java
The challenge
What date corresponds to the nth day of the year?
The answer depends on whether the year is a leap year or not.
Write a function that …
Read Article →Correct the time-string in Java
The challenge
- You have to create a method, that corrects a given time string.
- There was a problem in addition, so many of the time strings are …
Shifter Words Challenge in Java
The challenge
You probably know that some characters written on a piece of paper, after turning this sheet 180 degrees, can be read, although …
Read Article →Find Maximum and Minimum Values of a List in Java
The challenge
Make two functions, max and min that take a(n) array/vector of integers list as input and outputs, respectively, the largest and lowest …
Valid Parentheses in Java
The challenge
Write a function that takes a string of parentheses, and determines if the order of the parentheses is valid. The function should return …
Read Article →Boggle Word Checker in Java
The challenge
Write a function that determines whether a string is a valid guess in a Boggle board, as per the rules of Boggle. A Boggle board is a 2D …
Read Article →Build a pile of Cubes in Kotlin
The challenge
Your task is to construct a building which will be a pile of n cubes. The cube at the bottom will have a volume of n^3, the cube above …
Read Article →Which x for that sum in Kotlin
The challenge
Consider the sequence U(n, x) = x + 2x**2 + 3x**3 + .. + nx**n where x is a real number and n a positive integer.
When n goes to …
Reverse the bits in an integer in Java
The challenge
Write a function that reverses the bits in an integer.
For example, the number 417 is 110100001 in binary. Reversing the binary is …
Invert values in Kotlin
The challenge
Given a set of numbers, return the additive inverse of each. Each positive becomes negatives, and the negatives become positives. …
Read Article →Spring Boot no main manifest attribute, in
You have created a ./target/java -jar <app>.jar yet receive a spring boot no main manifest attribute, in …
Moduli number system in Kotlin
The challenge
A number system with moduli is defined by a vector of k moduli, [m1,m2, ···,mk].
The moduli must be pairwise co-prime, which means that, …
Smallest possible sum in Kotlin
The challenge
Given an array X of positive integers, its elements are to be transformed by running the following operation on them as many times as …
Read Article →Floating-point Approximation in Kotlin
The challenge
Given
- a semi-inclusive interval
I = [l, u)(l is in interval I but u is not)landubeing floating numbers(0 <= l < u), - an …
Multiplication table in Kotlin
The challenge
Create an NxN multiplication table, of size provided in parameter.
for example, when given size is 3:
1 2 3
2 4 6
3 6 9
for given …
Read Article →Strip Comments in Kotlin
The challenge
Complete the solution so that it strips all text that follows any of a set of comment markers passed in. Any whitespace at the end of …
Read Article →Experimenting with a sequence of complex numbers in Kotlin
The challenge
Consider the sequence S(n, z) = (1 - z)(z + z**2 + z**3 + ... + z**n) where z is a complex number and n a positive integer (n > 0). …
pt-online-schema-change Add Index
Percona has a great toolkit that allows you to perform schema changes on a MySQL or MariaDB database without any downtime, it works by creating a new …
Read Article →Sums of Parts in Kotlin
The challenge
Let us consider this example (array written in general format):
ls = [0, 1, 3, 6, 10]
Its following parts:
ls = [0, 1, 3, 6, 10]
ls = …Diophantine Equation in Kotlin
The challenge
In mathematics, a Diophantine equation is a polynomial equation, usually with two or more unknowns, such that only the integer solutions …
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