Web Reference: Jul 23, 2025 · A set is a data structure that stores a collection of unique elements , with no duplicates allowed. Sets can be implemented using a variety of data structures, including arrays, linked lists, binary search trees, and hash tables. 1.1 Defining sets d collection of distinct objects. The objects in a set are called the elements, or members, of the set. A se its members inside curly braces. For example, the set {2, 4, 17, 23} is t e same as the set {17, 4, 23, 2}. To denote membership we use the ∈ s mbol, as in 4 ∈ {2, 4, 17, 23}. On the other hand, non-membership is de Today we’re going to move on in our list of top-n abstract data types from the List to the Set. In order to give you some grounding in what a set is and how it differs from a list, we’re going to turn to an arcane and little-known subject: Mathematics.
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