Calculating the exact number of distinct items in a collection can be a difficult task if the collection is very large or if you have a very limited...
Recursion — according to Wikipedia — is: “something that occurs when a thing is defined in terms of itself or of its type” A nice visual example of...
Backtracking is one of my favorite algorithms because of its simplicity and elegance; it doesn’t always have great performance, but the branch-cutting...