It is well-known that a 3D rotation can always be represented by a quaternion. It is less well-known that a 4D rotation can always be represented by two quaternions, sending a point \$p=(a,b,c,d)^T\$ represented as the quaternion \$a+bi+cj+dk\$ to the point \$p'=xpy\$ for an appropriate choice of...
Ternary 2-input logic gate
Objective
Given an expression of a ternary 2-input logic gate, pretty-print its truth table.
Ternary logic and ternary operators
L, E, and G are the truth values of the ternary logic dealt here. They correspond to Haskell's LT, EQ, and GT.
The expression can have two fr...
A Fine sequence with fine interpretations
code-golfintegersequence
The ubiquitous Catalan numbers \$C_n\$ count the number of Dyck paths, sequences of up-steps and down-steps of length \$2n\$ that start and end on a horizontal line and never go below said line. Many other interesting sequences ca...
Given a list of fractions, group them so that each group sums to a whole number. This should be done in such a way to maximize the number of non-empty groups.
You may assume a solution exists. Order does not matter, both for the groups and their contents. You may output in any order.
Test Cases
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Route Planning for a delivery driver
There is a town that consists of a single long road with evenly spaced houses. Each house either needs rice, represented with a negative number, or can provide rice, represented with a positive number.
[-1, 50, -1, -1, -1, -50, 3, 1]
Here, the first house nee...
Screenshot / Code Snippet
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It's hard to miss these days - the Code of Conduct is about to change. It will emphasize the importance of using the correct pronoun when referring to a user in third person. This most often comes up in chat, and some users already have information about which...
