👉 In computer science, a "completions" is a type of operation that is performed on a data structure or collection. It can be defined as the number of elements in the collection that have been completed (meaning they have not yet been removed). In other words, it represents the size of the collection after performing some operations on it.
Some examples of completions in computer science include:
In a stack data structure, each element is either an element or null. The size of the