I challenge thee to a duel! Please note that this is an experimental challenge idea. Constructive criticism is welcomed Duels (on this site) are a type of competition between two people to perform a certain challenge is the shortest code they can. Your task is to duel a partner. How this will ...

There is a site "return true to win" with interesting tasks for javascript programers. The goal is to find arguments to a given function that force it to return true. The following is one of the tasks: function total(x) { return (x < x) && (x == x) && (x > x); } User must find x to force th...

Martin Ender has posted here a challenge to compute multinomial coefficients (some of the text here is copied from there). There is a fun algorithm to compute multinomial coefficients mod 2. Given a list of numbers, k1, k2, ... ,km, output the residue of the multinomial coefficient: reduced ...

When multiplying monomials in the Milnor basis for the Steenrod algebra, part of the algorithm involves enumerating certain "allowable matrices". Given two lists r1, ... ,rm and s1, ... ,sn, a matrix X is allowable if x00 = 0 For j>0, the sum of the jth column is equal to s_j: For i>0, ...