In atomic physics and quantum chemistry, the electron configuration is the distribution of electrons of an atom in atomic orbitals. For example, the electron configuration of the neon atom is 1s2 2s2 2p6. (From Wikipedia) Challenge Your challenge is to take a number representing the atomic ...

Characteristic polynomial Tags: code-golf, linear-algebra, math, matrix The characteristic polynomial of a square matrix A is defined as the polynomial pA(x) = det(Ix-A) where I is the identity matrix. Your task for this challenge is to compute the coefficients of such a matrix, for this you...

If you're going to downvote, explain why first. Otherwise it's a waste of a vote, and will be ignored. It's Meta, the vote has no effect without a known reason. Regular vectors A regular 2D shape is a shape where all interior and exterior angles are equal, and all sides are the same length,...

Bath Letters If you have a small child in your house, you may have come across foam bath letters. These can be moistened and stuck to flat surfaces such as tiles and the side of the bath to make words and messages. The range of words and messages is somewhat limited if you only have one set tho...

For any String that is composed of lower cased alphabetical characters, make a function that returns a list of all of it's variations, empty strings returns empty list Test Cases "" -> [] "a" -> ["a", "A"] "ab" -> ["ab", "Ab", "aB", "AB"] "abc" -> ["abc", "Abc", "aBc", "ABc", "abC", "AbC", "aBC...

Elections are Challenging This is a series of challenges in which two people, 1 and 2, are running for office. People deterministically vote in certain ways in the fun and exciting world of 1 and 2, which can lead to a series of possibilities for the candidates to do things such as figure out ...

Given an Integer array: Start from the first number Jump forward n positions where n is the value of the current position Delete the current position, making what was the next position the current position. Goto step 2 until there is one number remaining Print that number Rules The array wra...

Intersection of two triangles code-golf math geometry Given 4 points on the 2D planes A, B, C, D, calculate the area of the intersection region of the triangles OAB and OCD, where O is the center of the plane, having coordinate (0, 0). Algorithms that runs in constant time complexity (in terms...

Modulus Sum code-golf I call this sequence "the Jesus sequence", because it is the sum of mod.</pun> For this sequence, you take all the positive integers m less than the input n, and take the sum of those n modulo m. In other words: n-1 Σ n mod m m=1 For example, take the term 14: 14 ...