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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1answer
52 views
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 ...
3
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2answers
69 views
Stack and Queue implemented with a LinkedList
I am looking for feedback on my implementations of Queue, Stack, and LinkedList using Java ...
3
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1answer
92 views
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 ...
3
votes
1answer
53 views
MazeRunner in Java
To test the queue I perfected from one of my CR questions, I've developed a maze program that receives an input maze, starting and end positions, and solves it. I have separate software that handles ...
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0answers
27 views
Web scraper using Beautiful Soup
I am using Python 3 with Beautiful Soup to scrape web sites. I also used Thread to download images, but it will spend more than 30 minutes to get all information ...
2
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0answers
57 views
Blocking Memory Queue
This is a FIFO blocking memory queue in F# to be used as a component in a logging library.
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0
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1answer
36 views
Multi-layer queue
I must write code for my classes which simulates multi-layers production line. But I don't even know how to check if it's good. Can anyone take a look at my code, please? First machine works in random ...
4
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2answers
83 views
DoublingQueue in Java
Inspired by this CR question, I decided to create my own queue! If you guys see anything taboo or have any improvements, please let me know. Ultimately I want it to be feature rich and bug free, with ...
11
votes
5answers
542 views
FiniteArrayQueue type with interface and unit tests
Doing some exercises on basic data structures, I learned about queues, and decided to roll my own to better understand how a basic queue can function. As the name indicates, this Queue is made from a ...
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1answer
40 views
Implement MyQueue using two stacks
I am taking a helper stack, which is used during dequeue. Kindly suggest improvement or some solution with less complexity.
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2
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2answers
94 views
Array-based deque in Java
Are the conditions which I have included for insertion and deletion from front and rear sufficient and necessary? Have I missed some condition check? Or have I included some redundant condition?
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4
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3answers
59 views
Lock-free SPMC queue
Here is my lock-free queue implementation for single producer with some preallocated memory. T is a simple type with no need for move operations. I don't use ...
2
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0answers
56 views
Immutable queue implementation in Scala
I created a queue in which we can perform Enqueue, Dequeue and Traversing in Scala.
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5
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1answer
33 views
Converting Binary Tree to LinkedLists
The problem statement is :
Given a binary tree, design an algorithm which creates a linked list of all the
nodes at each depth (e.g., if you have a tree with depth D, you'll have D linked
...
10
votes
3answers
866 views
Animal shelter simulation using Queues
This is of one the interesting problems I've solved:
An animal shelter holds only dogs and cats, and operates on a strictly "first in, first out" basis. People must adopt either the "oldest" ...
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0answers
129 views
Are there pitfalls to this solution to read messages from a queue in parallel?
I've posted a question on stackoverflow: How can I consequently read messages from a queue in parallel? I would like my own answer to be reviewed.
Situation
We have one message queue. We would like ...
3
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0answers
50 views
Updatable priority queue
This is an updatable priority queue. In contains an index (implemented as std::unordered_map) which maps a value to its position in the queue itself. The queue is ...
6
votes
1answer
58 views
Queue implementation in Java
This is my Queue implementation in Java. Would appreciate a review of the code.
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6
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1answer
148 views
Priorizatable command queue
This code consistently executes commands with a given priority. How can I to improve it?
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4
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3answers
107 views
Implementing CircularQueue using Linked List in C++
I'm currently doing a project, requiring me to implement a CircularQueue data structure in C++:
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4
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2answers
766 views
Simple FIFO and LIFO ferry simulator
I am trying to make a ferry simulator with one ferry that works like a stack and another like a queue. I have a working class for stacks and queues with pop/push; I am trying to figure out how to ...
3
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2answers
63 views
LinkedList Queue implementation
I'm working on a project which simulates (very simple/watered down) a network. The basis of this is to learn how to implement a Queue. I understand there are many ...
2
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1answer
166 views
MPMC lock-free queue
I'm pretty new to the world of lock-free programming and would love some feedback on this code. I have been testing the queue with multiple producers and consumers, and with no unexpected output ...
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votes
2answers
125 views
Stack using two queues
I have implemented the Stack using two Queues q1 and q2 respectively as shown below in the code. I would like to get you reviews on whether it's an efficient way of implementing it or now.
For Pop ...
5
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2answers
214 views
4
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3answers
124 views
Lock-free MultiConsumer/MultiProducer queue
I've written a simple lock-free multi-consumer/-producer FIFO queue.
It's supposed to work like this:
At any time many consumers may read from it
At any time multiple producers can write to it, ...
3
votes
2answers
70 views
Lockless SCSP queue
I'm looking for a code review on a class that I've written. It was my first attempt at lockless programming and I'd love any feedback I can get.
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4
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2answers
243 views
Thread-safe lock free FIFO queue
A few years ago there was a need to add a FIFO queue between 2 threads into my project. At that time I've got some interesting idea how to do that without any atomics and locks. (There was a ...
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2answers
116 views
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5answers
378 views
RingQueue implementation using std::array
I've recently finished implementing a ring queue based on std::array in C++11. I tried to write the code as if I were going to submit it to the C++ Standard ...
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votes
1answer
86 views
Verify FIFO dequeue algorithm
I have a FIFO queue of packets, which maintains:
Push index
Pop index
Count
I would like to assert my dequeuing algorithm:
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5
votes
4answers
609 views
Implementation of C linked list (Queue) of C strings on mega AVR
I have been working on a mechanism to queue up strings coming into a system via a USART and have implemented it as a singly linked list. I have done my best to profile the code and its memory usage at ...
4
votes
1answer
64 views
Serializable Queue header only library
I was hoping someone could check the library I 'm working on to see if they could give any suggestions. My biggest issue right now is getting tuple to work with more than just the basic types and I ...
2
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1answer
197 views
Priority blocking queue implementation
This is a follow on question from one I asked a few days ago here: Single process blocking queue
Using the comments I determined that there probably isn't a pre-built solution for this and so I have ...
7
votes
1answer
878 views
Calculate the running median
I'm trying to solve a challenge where you need to calculate the median every time you add a number.
say you have a list of numbers: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10
...
3
votes
1answer
284 views
Making a copy constructor more flexible for ADT queue
I have constructed a copy constructor for an ADT queue. The copy constructor works fine. I would want to improve my code, but I don't really know how to shorten it to make it more flexible.
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6
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1answer
142 views
Lock-free, multiple consumer, multiple producer queue
I'm implementing a lock-free, multiple consumer, multiple producer FIFO queue/pipe as an exercise in thinking about atomicity in operations.
My main concern is correctness of operation, my second ...
4
votes
1answer
634 views
Lockless multi user, multi consumer FIFO queue using C++11
One of the features that is missing from C++11 are lockless queues. Therefore I have decided to write one myself.
A few remarks:
I know the code isn't technically lockless. However the lock is only ...
5
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1answer
80 views
MailQueue - follow up
Follow up of this question.
Things altered:
Put logging (debug level) for creating and starting thread.
A separate thread for starting the different threads.
Locking object and synchronise for ...
7
votes
2answers
169 views
MailQueue implementation with auto start - stop
Previous question was a little portion of the mailQueue.
I finished the MailQueue, which has the ability to start and stop ...
6
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2answers
156 views
Templated queue implementation
I wrote an implementation for a simple queue in C++ (for practice, since there's an stl queue). I've been trying to focus on memory management and the rule of three. Any suggestions/improvements?
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2
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2answers
269 views
ConcurrentLinkedQueue to unmodifiable list
I have a ConcurrentLinkedQueue where I put some mails in. Now I have a visual page where I want to see what's in the Queue, but ...
3
votes
2answers
138 views
Shutdown method in queue implementations
I am trying to implement a shutdown method in queue implementation. I took the code from BlockingQueue source from Java and trying to check the shutdown method. Will the following code be thread safe ...
2
votes
1answer
858 views
Priority Queue Linked List Implementation
I am new to Python and wanted to make sure my code answers the question for my assignment due.
My Task:
A priority queue is a queue in which each item is assigned a priority
and items with a ...
2
votes
1answer
316 views
Fixed size double-ended queue
I require hundreds of equal, small sized buffers in my current project. The bulk of the computation in the program operates on data stored directly in those containers, so high performance is ...
2
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0answers
34 views
Functional, Loaner-Like Pattern For Consuming SQS Queues, Deleting Queue Items On Success
My program fetches input from a RabbitMQ or Amazaon SQS-like queue. There is not always input available in the queue. If a message is available, it triggers work. If that work is successful, ...
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0answers
535 views
Simple Priority Queue
I am trying to implement A* search on a grid in MATLAB. I am currently using a priority queue class I found here, but it's a bit slow. I tried to write this simple priority queue class in MATLAB:
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2
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1answer
90 views
Asynchronously load and unload a queue
This code is supposed to asynchronously load a queue from a generating function.
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2
votes
1answer
2k views
Array-based FIFO queue in C
I have this "generic" implementation of an array-based FIFO-queue. As I have written very little code in C, I don't have an idea what to ask, so feel free to tell anything that comes to mind.
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3
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1answer
5k views
Printing a tree level by level
I have written a program to print a binary tree level by level on different lines, like the tree would actually look if drawn on paper.
I have done a BFS traversal and then I proceed to print the ...
