c - Name this data structure? -

I have a data structure that supports the following tasks:

1. In an item Can be inserted continuous time data structure for that item provides a unique positive integer (Explanation: Assigned integer, there is no function of the inserted item, and there is no option on the user's assigned integer. Is selected by the structure.)
2. Using that integer, the item can be found in the constant.
3. The item can be removed continuously by using that integer

It is implemented using an array of pointers where there are fixed integer indices where Items are stored. Linked-list for continuous time insertion is tied to unused index in fashion.

What is the name of this type of data structure?

This is an array "." With