Whether the queue is a first-in-and-out linear table

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A queue is a first-in-first-out linear table.

Queue is a special linear table, which is special in that it only allows deletion at the front end of the table (front) and insert operation at the back end of the table (rear). Like the stack, queue is a linear table with limited operations. The end of the insert operation is called the end of the queue, and the end of the delete operation is called the head of the line. When there are no elements in the queue, it is called an empty queue.

The data element of a queue is also called a queue element. Inserting a queue element into the queue is called queuing, and removing a queue element from the queue is called dequeuing. Because queues are only allowed to be inserted at one end and deleted at the other end, only the earliest elements that enter the queue can be deleted from the queue first, so the queue is also known as the first-in-first-out (FIFO-first in first out) linear table.

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