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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]
The name "peek" is similar to the basic "push" and "pop" operations on a stack, but the name for this operation varies depending on data type and language. Peek is generally considered an inessential operation, compared with the more basic operations of adding and removing data, and as such is not included in the basic definition of these data ...
Other operations may also be allowed, often including a peek or front operation that returns the value of the next element to be dequeued without dequeuing it. The operations of a queue make it a first-in-first-out (FIFO) data structure. In a FIFO data structure, the first element added to the queue will be the first one to be removed.
In addition, peek (in this context often called find-max or find-min), which returns the highest-priority element but does not modify the queue, is very frequently implemented, and nearly always executes in O time. This operation and its O(1) performance is crucial to many applications of priority queues.
The decrease key operation replaces the value of a node with a given value with a lower value, and the increase key operation does the same but with a higher value. This involves finding the node with the given value, changing the value, and then down-heapifying or up-heapifying to restore the heap property. Decrease key can be done as follows:
Three men still remain on federal death row after President Joe Biden issued sweeping commutations Monday to the sentences of 37 other prisoners who were awaiting execution.. Biden's decision is ...
December 15, 2024 at 8:14 AM Shop these 10 thoughtful gifts under $50 from Nordstrom that’ll arrive in time for Christmas We're in the homestretch for Christmas gift shopping now.
From January 2008 to December 2012, if you bought shares in companies when David W. Bernauer joined the board, and sold them when he left, you would have a 55.9 percent return on your investment, compared to a -2.8 percent return from the S&P 500.