Questions tagged [queue]
A queue is an ordered, first-in-first-out (FIFO) data structure. Typical implementations of queues support pushing elements to the back and popping them off the front position.
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Fixed-size array-based implementation of a queue
For my computer science class, I've implemented a Java version of a queue and would like to know if there's anything wrong with it. After my tests, it seems to work fine, but maybe somebody can point ...
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Smart Pointers Queue Implementation
To practice around with C++11 smart pointers I was trying to implement a simple Queue to go beyond a simple Linked List. The fact that the _first and ...
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Queue that permits at most X simultaneous operations
I ran into this once (permits=N) and then again today (permits =1) where I only want 1 to N operations running simultaneously. One example comes from firing into a state machine (the permit=1 example)...
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Concurrent Queue using Ada SPARK with the Ravenscar profile
See here: https://gitlab.com/linted/linted/blob/162b5e9fba53a90b3c6d78e214776e069c3c722b/src/ada-core/src/linted-queues.adb
The code implements a concurrent queue.
It can't allocate memory or use ...
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Single producer single consumer command queue
I needed to create commands simply with lambda and execute it in another thread. The following code works fine. Any suggestions about performance are appreciated.
I want to use SSE aligned variables ...
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Double-ended queue and iterators
I have created a double-ended container, but I have doubts about its efficiency in terms of performance. Can you please criticize the code? What can be done extra, such as shortening it?
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Insert and Remove Element in Deque using threads in C++
The following code works fine for inserting and removing an element from a deque using two threads.
I would appreciate any help on how to make it better, especially in terms of thread safety.
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Implement queue using two stacks
Although it's a well-known algorithm, I thought to implement it from the perspective of a coding interview. I want to know if I can improve my code somehow. So, given the time constraint, is this a ...
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Linked-list-based stack and queue
This is my first attempt at building a linked-list-based stack and queue. It is the result of ~90 minutes of trying to implement some of what we're being taught in Algorithms class.
I would like ...
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Popup message queueing
I have a WPF application where I have a function for generating an overlaying info grid.
I have written some code for queueing the messages(IpopupMessage) so that each displays a certain amount of ...
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Implementing a queue using a circular buffer
I'm working on implementing a queue using a circular buffer problem. Any smarter ideas for better time complexity, any code bug or code style advice are highly appreciated.
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Writing a thread-safe queue in C++
I created a SafeQueue class, which stores pointers. It has two methods:
push: Adds a new pointer to the queue
next: If the queue is empty, returns nullptr. ...
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Time-delayed function queue
I recently had an interesting requirement in a test environment where I needed to simulate actions at varied (random) intervals in a node back-end. They needed to ...
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Implementation of std::deque
In the prior obsolete implementation of std::deque, I used two std::vectors to contain the elements. But the standard guarantees that pointers and references to elements aren't invalidated when an ...
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Python simulacrum of windows copy window
I wrote a program to copy files with an progress bar that looks similar to Windows built in function. The copy function is run in a separate thread and the tkinter GUI is run in the main thread. This ...
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Templated double ended queue (deque) move semantics edge cases C++
My original deque implementation and efficiency question lacked move semantics. After ratchet freak provided an example of how to define them I decided to try adding them to my deque. The unit test + ...
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Template double ended queue (deque) implementation using dynamic allocation C++
I have written my own deque class to get a better grasp of C++ pointers and memory management. The following code is part of a larger 2D isometric game I am developing. It compiles and runs fine using ...
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Semaphore based concurrent work queue
There's a need to have a mechanism in place that will process messages received from the network concurrently. However, only X number of messages can be allowed to be processed concurrently and there'...
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FIFO Queue Implementation
My Implementation of a FIFO queue. I am mainly curious about my initialization of empty generic arrays.
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Animal Shelter in Java
I have been working my way through the problems in the book Cracking the Coding Interview. The instructions were to maintain an animal shelter that operates on a first in, first out basis (i.e. it is ...
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Job queue with threading
On many articles and blogs, I have read that exceptions should not decide flow of your code.
I have wrote the following code using one thread:
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Implementing a queue using three stacks
This is just for fun so you will see tons of print statements for trouble shooting. I was hoping on slimming this down some and gain new ideas on what I have. This was a challenge question in a class ...
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C++ thread safe queue implementation
I'm using this class for producer-consumer setup in C++:
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Implementing a generic Queue in C
I wrote a generic Queue that could with work any data type you give it. The Queue can do any the basic operations that you would expect a ...
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Deque Implementation in Java
Please review my Deque implementation in Java and suggest ways of improving this.
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My own Queue Implementation in Java
Please review my Queue implementation and let me know if you have any suggestions. I am not returning an exception for any of the methods defined here. As we know ...
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Checking number of messages in jms queue code
I need to check number of messages in a jms queue for that i am using queuebrowser.
Actually i have 2 queues. I check if there are more then 10 messages in second queue then the first queue should not ...
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Generic Queue (Array and Linked List) Implementation
I am working on brushing up my data-structures knowledge, and was hoping to have my code/thoughts reviewed.
Interface:
...
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Array-based queue implementation
Here I have implemented a queue. Is this a correct, efficient queue implementation? what issues are there if any and what can be done to make it better?
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Implementation of Queue using Linkedlist in Java
Can someone please review my code? Is it the correct implementation of a queue? If not, please give suggestions on how to implement it using a linked list.
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C++ Queue Implementation
so I wrote a queue implementation in c++ and even though I know the code probably isn't as robust as it should be and probably doesn't perform all the checks it should, I'd like to know mostly if ...
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C Threadsafe Priority Queue O(log n) push, O(1) pop
I wrote this for an A* implementation:
(pqueue.c)
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Designing stack and queue from scratch in C
As a beginner and curious guy I'm interested in implementing data structures and algorithms from scratch. Here's my implementation of Stack and Queue, the most fundamental data structures.
Are ...
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Receptive map queue
I've written a class I call ReceptiveMapQueue. Its purpose is to organize the internal structure of an AFKable RPG. It only has two public methods - dumping entries ...
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Request Queue for League of Legends API
I am working on some website for League of Legends statistics, which uses the RiotGames API.
The API allows you to do a maximum amount of requests per 10 seconds, and another maximum amount of ...
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Implement a queue using two stacks
I tried to implement a queue using two stacks. I saw there are questions about this topic, but in my example, I used build-in stack from java. My question is, can someone give me some advice to make ...
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Implementation of a queue for digicode-like system
What it is about
I created an application where you need to push invisible buttons in a certain order to unlock the advanced mode. To handle this, I wanted to use a queue (FIFO) of my own, adapted to ...
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Queue class with enqueue and dequeue
I am just learning swift and tried to make a queue class with enqueue and dequeue.
The node holds the data for each element
The enqueue adds an element to the "queue"
The dequeue deletes the first ...
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Finding the Least Common Ancestor of a Binary Tree
Input a binary tree (the root node) and 2 other nodes that need to be assessed for finding the least common ancestor (LCA)
Code:
a. Finding the nodes first with either ...
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Queue using Stack
I implemented this solution for the problem. Please provide feedback and review if this can be improved in any way.
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C++ fixed-size queue full/empty signaling
I'm considering an application where a large data needs to be written to file often. I would like to use a queue and have a producer and consumer running on different threads. Additionally, I would ...
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Queue resizing array implementation
After learning about linked list implementations of a queue I was asked to try a resizing array implementation. I'm looking for constructive criticism.
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Queue implementation using two stacks
Here's my code and I want to know if there's a better method for doing so. While the question has stated two stacks I wonder if we could do only with one as well?
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Array-based queue implementation using C
I wrote this header for generic use of a queue. The one thing I'm wondering is if I understood the usage of void*. I hope that if somebody teach me some conventions ...
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Pipeline with std::thread vectors and queue
here is my code, it works but after few iterations it slows down and stop without any error, I'm looking for a more efficient solution.
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Implementing Binary Tree using Queue in C#
I am in the process of learning data structures and I am trying to implement Binary Tree using Queue in C#.
Below are my Tree implementation classes.
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My Queue implementation is correct?
I have read CLRS Introduction to Algorithms book, now I'm on Elementary data structure chapter. I read about queue concept and try to implement in c.
I have tested a lot it work fine, but I have a ...
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Stack and Queue implemented with a LinkedList
I am looking for feedback on my implementations of Queue, Stack, and LinkedList using Java ...
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MazeRunner in Java - follow-up
I've refined a lot of the code from my previous question, and have also decided to include the logic that interprets a given text file. Any advice on how to improve the actual algorithm that solves ...
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