Gauss to Eisenstein mathabstract-algebragridnumbercomplex-numbers Given a Gaussian number A+B*i where A,B are integers and i = exp(2*pi*i/4) is the imaginary unit, return the closest Eisenstein integer K+L*ω where K,L are integers and ω = exp(2*pi*i/3) = 1/2(-1+i√3). Background It is probably...

Background The Fibonacci sequence is defined as f(1) = 1 f(2) = 1 f(n) = f(n-1) + f(n-2) The Fibonorial, similar to the factorial, is the product of the first n Fibonacci numbers. g(n) = f(1) * f(2) * ... * f(n-1) * f(n) The Fibonomial coefficient, similar to the binomial coefficient is de...

My PPCG holiday is over :D Intro Fractional time is the year (2016) plus the value (minute of year) / number of minutes in the year. Example calculation Let's say we want to convert the time: 17:34 3rd March 2013 to fractional time. Firstly, you find how many minutes were in 2013: 525600 minu...

The Challenge Given either a string or a multiline string, output the text in the shape of a square. You can assume that the text will always fit in a square, and that it will never be an empty string. Example Input: Hi, world Output: Hi, wo rld Test Cases Input: Hi, world! Hello Output...

100 Day Countdown It is common to start countdowns 100 days prior to an event, probably because of our base 10 system. Examples of this can be found everywhere: 100 days until your birthday 100 days until the wedding 100 days until the election 100 days until our graduation 100 days until her ...

Input ∩ Source The challenge is to create a program/function that prints the intersection of its own source code and a given string input. This is code golf and to be more precise: Let I be the input set {"a","b","c"} Let S be the source code set {"b","f"} Then the intersection is what ...