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In computer science, a double-ended queue (abbreviated to deque, / d ɛ k / DEK [1]) is an abstract data type that generalizes a queue, for which elements can be added to or removed from either the front (head) or back (tail). [2] It is also often called a head-tail linked list, though properly this refers to a specific data structure ...
When is empty, the reverse takes () where is the number of elements in . But, we can say it is O ( 1 ) {\displaystyle O(1)} amortized time, because every element in f {\displaystyle f} had to be inserted and we can assign a constant cost for each element in the reverse to when it was inserted.
For the stack, priority queue, deque, and DEPQ types, peek can be implemented in terms of pop and push (if done at same end). For stacks and deques this is generally efficient, as these operations are O (1) in most implementations, and do not require memory allocation (as they decrease the size of the data) – the two ends of a deque each ...
The Deque interface extends the Queue interface. [25] Deque creates a double-ended queue. While a regular Queue only allows insertions at the rear and removals at the front, the Deque allows insertions or removals to take place both at the front and the back. A Deque is like a Queue that can be used forwards or backwards, or both at once ...
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An abbreviation for double-ended queue (more commonly, deque This page was last edited on 20 February 2011, at 14:50 (UTC). Text is available under the Creative ...