Topological ordering is ordering dependent items in such a way that items you depend upon come first in the ordering. For example if x depends on y and y depends on z then the topological order would be z, y, x. Maybe dependency ordering would be a better name; it

The other day I hit a combinatorial explosion when using Haskell's nub function. Whilst I knew it was \( O(n^2) \) I thought my \( n \) (~28,000) wasn't big enough to cause a problem. Turns out it was... Therefore to get a better feel for the