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Are FIFO and LIFO forms of access used to add and remove nodes from queue?
Wiki User
∙ 8y ago
No. FIFO is a first-in, first-out structure, and this describes how nodes are inserted and extracted from a queue. That is, new nodes are inserted at the back of the queue while existing nodes are extracted from the front of the queue. In other words, nodes are processed on a first-come, first-served basis.
However, LIFO is a last-in, first-out structure and this describes how nodes are inserted and extracted from a stack. You can think of a stack as being like a stack of plates such that the top-most plate is always the first to be extracted while new plates are placed on top of existing plates. Stacks are typically used in backtracking algorithms because nodes are extracted in the reverse order they were inserted upon the stack.
Wiki User
∙ 8y ago
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What are advantages and disadvantages of priority queue?
In CQ we utilize memory efficiently. because in queue when we delete any element only front increment by 1, but that position is not used later. so when we perform more add and delete operation, memory wastage increase. But in CQ memory is utilized, if we delete any element that position is used later, because it is circular.
How ordinary queue is solved in circular queue?
An ordinary queue requires constant time access to the first and last elements, because all insertions occur at the back of the queue and all extractions at the front. Thus we require two pointers. However, with a circular queue, the next element after the last element is always the first element, thus we gain constant-time access to both the front and back of the queue through a single pointer to the back of the queue.
Write a program in c language to reverse elements of a queue?
There are many ways to reverse the order of the elements in a queue. Provided that you have access to the implementation of the queue, it is of course easy to read the elements from the tail end rather than the front end, thus reversing the elements. However, considering the queue as a black box, and assuming the queue only allows for its characteristic operations (removal of head element, addition to tail), the best method to reverse the elements in a queue to engage a stack. You'd remove the elements from the queue (always reading the head of the queue), and push each element onto the stack. When the queue is empty, you reverse that process: pop each element from the stack until it is empty, and add each element in this order to the end of the queue. Your queue will have the exact same elements as in the beginning, but in reverse order. The exact implementation of this in C, or in any other programming language, is trivial, but the exact source code depends on the implementation of queue and stack containers. Following is pseudocode: Queue<Item> reverse (Queue<Item> queue) { Stack<Item> stack; Item item; while (queue.remove(&item)) { stack.push(item); } while(stack.pop(&item)) { queue.add(item); } return queue; }
How do you implement queue using singly linked list?
Queues are a first in first out structure (FIFO). This means all extractions occur at the head of the list and all insertions occur at the tail. This requires that you maintain pointers to the head and tail node to allow constant time insertion and extraction of nodes. The nodes themselves are singly linked, each pointing to the next node. The tail node always points to NULL until a new node is insert, which the tail points to. The new node then becomes the tail. When extracting a head node, its next node (which may be NULL if it is also the last node) becomes the new head of the list. If the head is NULL, the tail is also set to NULL.
Can you give the explanation for various operations in a queue implementation using arrays?
The following are operations performed by queue in data structuresEnqueue (Add operation)Dequeue (Remove operation)Initialize
What are advantages and disadvantages of priority?
The advantage of a priority queue is that nodes can be weighted, allowing those with greater precedence to be moved towards the head of the queue, in front of those with lesser priority, rather than always being added to the tail of the queue as would happen in a normal queue. The disadvantage is that insertions are no longer performed in constant time as new nodes must use insertion sort to find their place in the queue (behind nodes with greater or equal priority). However, if the variable weights are finite, maintaining pointers for each weight in a static array will provide constant time insertions.
What are advantages and disadvantages of priority queue?
In CQ we utilize memory efficiently. because in queue when we delete any element only front increment by 1, but that position is not used later. so when we perform more add and delete operation, memory wastage increase. But in CQ memory is utilized, if we delete any element that position is used later, because it is circular.
How ordinary queue is solved in circular queue?
An ordinary queue requires constant time access to the first and last elements, because all insertions occur at the back of the queue and all extractions at the front. Thus we require two pointers. However, with a circular queue, the next element after the last element is always the first element, thus we gain constant-time access to both the front and back of the queue through a single pointer to the back of the queue.
What English word can have 4 of its 5 letters taken away and still retain its original pronunciation?
Queue or Q (as in waiting in a queue or the letter Q)
Write a program in c language to reverse elements of a queue?
There are many ways to reverse the order of the elements in a queue. Provided that you have access to the implementation of the queue, it is of course easy to read the elements from the tail end rather than the front end, thus reversing the elements. However, considering the queue as a black box, and assuming the queue only allows for its characteristic operations (removal of head element, addition to tail), the best method to reverse the elements in a queue to engage a stack. You'd remove the elements from the queue (always reading the head of the queue), and push each element onto the stack. When the queue is empty, you reverse that process: pop each element from the stack until it is empty, and add each element in this order to the end of the queue. Your queue will have the exact same elements as in the beginning, but in reverse order. The exact implementation of this in C, or in any other programming language, is trivial, but the exact source code depends on the implementation of queue and stack containers. Following is pseudocode: Queue<Item> reverse (Queue<Item> queue) { Stack<Item> stack; Item item; while (queue.remove(&item)) { stack.push(item); } while(stack.pop(&item)) { queue.add(item); } return queue; }
How do you unqueue pvp and arenas?
To unqueue from the (random) battleground and arena queue, simply hit the "H" key, which will take you to the PvP screen. On the second tab, there should be a button at the bottom reading "Leave Queue". Pressing this will remove you from the queue. It is the same button (now: Enter Queue) which you use to enter the queue in the first place.
What 5 letter word will be pronounced the same even if you remove four of its letters?
The word is queue, pronounced "Q."The same would apply to the letter name "aitch," if you remove the first four letters.
How do you implement an ordinary queue in C?
An ordinary queue is a first-in, first-out structure -- analogous with a queue of people waiting to be served. The simplest implementation employs a singly-linked circular list. This is like an ordinary singly-linked list, but the tail node points "down" to the head node rather than to NULL. By keeping track of the tail node (rather than the head node), we gain constant-time access to both the head and the tail through a single pointer. The basic implementation details of the push and pop methods are as follows: void push (Node* n) { if (tail==NULL) { // the queue is empty n->next = n; // the new node becomes the head (point to self) } else { // the queue has one or more nodes n->next = tail->next; // point to the current head of queue } tail = n; // the new node becomes the tail } void pop () { if (tail==NULL) return; { // can't pop an empty queue Node* head = tail->next; // temporarily point to the current head if (head == tail) { // special case: a queue of 1 node (tail points to self) free (head); tail = NULL; // the queue is now empty } else { // general case: a queue of 2 or more nodes tail->next = head->next; // set the new head free (head); // release the old head } }
What is the program of breadth first search in c plus plus?
The algorithm for breadth first search is to start at the root node or at an arbitrary node within the tree. First, push this node onto a queue. Then proceed as follows 1. If the queue is empty, quit the search and return a "not found" result. 2. Pop the first node from the queue. 3. If this node contains the value you seek, quit the search and return the node. 4. Enumerate the child nodes (if any), and push them onto the queue. 5. Go to step 1.
How do you implement queue using singly linked list?
Queues are a first in first out structure (FIFO). This means all extractions occur at the head of the list and all insertions occur at the tail. This requires that you maintain pointers to the head and tail node to allow constant time insertion and extraction of nodes. The nodes themselves are singly linked, each pointing to the next node. The tail node always points to NULL until a new node is insert, which the tail points to. The new node then becomes the tail. When extracting a head node, its next node (which may be NULL if it is also the last node) becomes the new head of the list. If the head is NULL, the tail is also set to NULL.
Can you give the explanation for various operations in a queue implementation using arrays?
The following are operations performed by queue in data structuresEnqueue (Add operation)Dequeue (Remove operation)Initialize
What 5 letter word can you remove 4 letters from without changing the pronunciation?
aitch, queue
