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, …
Technical Articles
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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 …
Read Article →Matrix Addition in Java
The challenge
Write a function that accepts two square matrices (N x N two dimensional arrays), and return the sum of the two. Both matrices being …
Numbers that are a power of their sum of digits in Java
The challenge
The number 81 has a special property, a certain power of the sum of its digits is equal to 81 (nine squared). Eighty one (81), is the …
Read Article →Integer triangles in Java
The challenge
You have to give the number of different integer triangles with one angle of 120 degrees which perimeters are under or equal a certain …
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