priority-queue | A priority queue for Rust with efficient change function | Hashing library

 by   garro95 Rust Version: Current License: No License

kandi X-RAY | priority-queue Summary

kandi X-RAY | priority-queue Summary

priority-queue is a Rust library typically used in Security, Hashing applications. priority-queue has no bugs, it has no vulnerabilities and it has low support. You can download it from GitHub.

A priority queue for Rust with efficient change function.
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            kandi-support Support

              priority-queue has a low active ecosystem.
              It has 141 star(s) with 23 fork(s). There are 6 watchers for this library.
              OutlinedDot
              It had no major release in the last 6 months.
              There are 6 open issues and 25 have been closed. On average issues are closed in 57 days. There are no pull requests.
              It has a neutral sentiment in the developer community.
              The latest version of priority-queue is current.

            kandi-Quality Quality

              priority-queue has 0 bugs and 0 code smells.

            kandi-Security Security

              priority-queue has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.
              priority-queue code analysis shows 0 unresolved vulnerabilities.
              There are 0 security hotspots that need review.

            kandi-License License

              priority-queue does not have a standard license declared.
              Check the repository for any license declaration and review the terms closely.
              OutlinedDot
              Without a license, all rights are reserved, and you cannot use the library in your applications.

            kandi-Reuse Reuse

              priority-queue releases are not available. You will need to build from source code and install.
              Installation instructions are not available. Examples and code snippets are available.

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            priority-queue Key Features

            No Key Features are available at this moment for priority-queue.

            priority-queue Examples and Code Snippets

            get a fixed priority queue
            pythondot img1Lines of Code : 23dot img1License : Permissive (MIT License)
            copy iconCopy
            def fixed_priority_queue():
                fpq = FixedPriorityQueue()
                fpq.enqueue(0, 10)
                fpq.enqueue(1, 70)
                fpq.enqueue(0, 100)
                fpq.enqueue(2, 1)
                fpq.enqueue(2, 5)
                fpq.enqueue(1, 7)
                fpq.enqueue(2, 4)
                fpq.enqueue(1, 64)
                fpq.en  
            show element priority queue
            pythondot img2Lines of Code : 23dot img2License : Permissive (MIT License)
            copy iconCopy
            def element_priority_queue():
                epq = ElementPriorityQueue()
                epq.enqueue(10)
                epq.enqueue(70)
                epq.enqueue(100)
                epq.enqueue(1)
                epq.enqueue(5)
                epq.enqueue(7)
                epq.enqueue(4)
                epq.enqueue(64)
                epq.enqueue(128)
                print  
            Build a map from the priority queue .
            javadot img3Lines of Code : 19dot img3no licencesLicense : No License
            copy iconCopy
            static TreeMap buildMap(PriorityQueue pq) {
                    TreeMap result = new TreeMap<>();
                    Set accum = new HashSet<>();
                    while (!pq.isEmpty()) {
                        Action poll = pq.poll();
                        if (poll.add) {
                            ac  

            Community Discussions

            QUESTION

            How to show float value instead of 0 integers
            Asked 2022-Feb-22 at 04:21

            I tried to allow decimal value in the result but however it still shows 0, what am i missing in the following codes?

            I have declared the weight variable as a float value, but it won't convert as i input decimal in my graph.AddEdge(). Is there any error in my variable passing parameters?

            ...

            ANSWER

            Answered 2022-Feb-22 at 04:21

            You're using a vector instead of using a vector for distance. You need to use vector so that the elements are stored as float as shown below:

            Source https://stackoverflow.com/questions/71215756

            QUESTION

            How can I implement a numba jitted priority queue?
            Asked 2022-Feb-07 at 04:31

            I am failing to implement a numba jitted priority queue.

            Heavily plagiarized from the python docs, I am fairly happy with this class.

            ...

            ANSWER

            Answered 2021-Sep-15 at 10:48

            This was not possible due to several issues in numba, but should be fixed for the next release (0.55) if I understood correctly. As a workaround for now, I could get it working by compiling llvmlite 0.38.0dev0 and the master branch of numba. I do not use conda but it is apparently easier to get pre-releases of llvmlite and numba this way.

            Here is my implementation:

            Source https://stackoverflow.com/questions/68585821

            QUESTION

            Reverse order Priority Queue
            Asked 2021-Dec-16 at 23:18

            Does anyone know if it is possible to reverse the order in a priority queue in Rust? When I peek the queue, I want the lowest i32 to be received. However, it seems that it by default returns the highest i32.

            Edit

            This is the package I am using: docs.rs/priority-queue/1.2.0/priority_queue

            ...

            ANSWER

            Answered 2021-Sep-22 at 11:43

            As per the documentation of the crate (package).

            I believe you should be using DoublePriorityQueue instead of PriorityQueue as it offers to peek in the queue the highest value or the lowest. Using peek_max or peek_min respectively.

            See the snippet of code they provide in the documentation:

            Source https://stackoverflow.com/questions/69283291

            QUESTION

            How to iterate through a dict of tuples from Stack Overflow api
            Asked 2021-Oct-10 at 15:06

            I am using the Stack Overflow api to search for questions by passing a query.

            I am using the following code:

            ...

            ANSWER

            Answered 2021-Oct-10 at 13:09

            The type of the value of the key items inside the dict is list so you can manipulate it using list comprehension. For example -

            Source https://stackoverflow.com/questions/69515364

            QUESTION

            Accessing a base class member with .*& (accessing priority_queue container)
            Asked 2021-Sep-01 at 11:50

            I'm trying to understand the code below from

            How to iterate over a priority_queue?

            I gather that since HackedQueue is deriving privately from priority_queue, it can access its privates. So, I assume that *&HackedQueue::c returns the address of the base class object, and its called for q. Not fully clear, though, and even more how it's a valid syntax.

            Mentioning priority_queue, I was wondering if there's still no cleaner workaround. For example, the 4th c'tor on this link

            priority_queue( const Compare& compare, Container&& cont );

            https://en.cppreference.com/w/cpp/container/priority_queue/priority_queue

            seems to provide a container to work with and not as read only input. I don't see it though in visual studio header file, and I'm not clear what is &&.

            Related, I don't understand opposing questions such as why I need access to the private container, it's not made for that. Well, how do you debug a priority queue, where the basic need is to print its elements?

            ...

            ANSWER

            Answered 2021-Sep-01 at 11:50

            I'm trying to understand the code below from

            Let's say in points:

            Source https://stackoverflow.com/questions/69012795

            QUESTION

            Unexpected behaviour java priority queue. Object added once but polled out twice. How could it be possible?
            Asked 2021-May-30 at 09:33
            import java.util.*;
            
            public class Main {
                public static void main (String[] args) {
                    Solution solution = new Solution();
                    int[] res = solution.assignTasks(new int[]{3,3,2}, new int[]{1,2,3,2,1,2});
                }
            }
            class Solution {
                public int[] assignTasks(int[] servers, int[] tasks) {
                    PriorityQueue free = new PriorityQueue(); // (wt, id, time)
                    PriorityQueue busy = new PriorityQueue(); // (time, wt, id)
                    
                    for (int i = 0; i < servers.length; i++) {
                        free.add(new Pair(servers[i], i, 0));
                        System.out.println("Free Added " + i + " " + servers[i] + " " + i + " " + 0 + " " + free.size());
                    }
                    
                    int[] ans = new int[tasks.length];
                    for (int i = 0; i < tasks.length; i++) {
                        Pair b = busy.peek();
                        while (b != null && b.a <= i) {
                            busy.poll();
                            System.out.println("Busy Polled " + i + " " + b.a + " " + b.b + " " + b.c + " " + busy.size());
                            free.add(new Pair(b.b, b.c, b.a));
                            System.out.println("Free Added " + i + " " + b.b + " " + b.c + " " + b.a + " " + free.size());
                            b = busy.peek();
                        }
                        Pair p = free.poll();
                        
                        int wt = p.a;
                        int id = p.b;
                        
                        // int time = p.c;
                        System.out.println("Free Polled " + i + " " + p.a + " " + p.b + " " + p.c + " " + free.size());
                        
                        ans[i] = id;
                        busy.add(new Pair(i + tasks[i], wt, id));
                        System.out.println("Added to Busy " + i + " " + (i + tasks[i]) + " " + p.a + " " + p.b + " " + busy.size());
                    }
                    
                    return ans;
                }
            }
            class Pair implements Comparable {
                int a, b, c;
                Pair(int x, int y, int z) {
                    a = x;
                    b = y;
                    c = z;
                }
                public int compareTo(Pair p) {
                     if (this.a == p.a) {
                         if (this.b == p.b) return this.c - p.c;
                         return this.b = p.b;
                     }
                     return this.a - p.a;
                 }
                
            }
            
            ...

            ANSWER

            Answered 2021-May-30 at 09:33

            It is not entirely clear, but I think your problem is caused by an incorrect implementation of compareTo.

            Source https://stackoverflow.com/questions/67758061

            QUESTION

            time complexity of priority_queue in C++
            Asked 2021-Apr-28 at 20:07

            I have been trying to figure out the time complexity of a priority_queue. This post here states that the complexity of this container depends on the underlying container. My question is for a priority_queue declared as such

            ...

            ANSWER

            Answered 2021-Apr-28 at 20:07

            Heap insertion and extraction have the worst case complexity relative to the height of the tree, thus O(log N), plus the complexity of the underlying data structure.

            In case of a vector, push_back has an amortized complexity O(1), and pop_back O(1).

            Therefore it can be said that the total time complexity of push and pop of a priority_queue backed by a vector is O(log N).

            Source https://stackoverflow.com/questions/67306334

            QUESTION

            In Boost:asio how to reserve one thread for any particular activity
            Asked 2021-Jan-29 at 16:48

            I am creating an HTTP client where I need to push data to server. Things are working fine, now the requirement is that there should be one dedicated connection established with server for some priority data. For e.g. I have 2 HTTP connections open with server then one connection should always be available to push high priority data to server and where as the other connection can be used for pushing rest of stuff.

            I tried with make_strands using this however that puts my activities in sequential execution.

            I also tried with multiple io_context but it adds additional complexities. Is there any simple way to fulfill the requirement. Thanks.

            ...

            ANSWER

            Answered 2021-Jan-29 at 16:48

            I also tried with multiple io_context but it adds additional complexities.

            I think this is a basic misconception: it doesn't actually (as long as you don't explicitly bind handlers to executors from a different execution context, perhaps. But such a thing is hard to do accidentally).

            Now if the requirement is:

            For e.g. I have 2 HTTP connections open with server then one connection should always be available to push high priority data to server and where as the other connection can be used for pushing rest of stuff.

            Then the answer is you can all that without using multiple threads at all. If you appear to require threads still, this indicates that you're performing longer running tasks inside handlers (blocking the io thread(s)).

            Indeed in such case you may indeed want to have a dedicated execution context that is being run on a separate thread(s).

            The simplest solution given your pre-existing situation would be to, indeed, have a second io_context that you run from its own thread.

            My more common guideline would be the inverse: prevent the situation you have by never executing any blocking tasks on the UI thread. This leads to a design where I have only one IO thread usually, and the actual work gets put on task queues that can be serviced from a thread pool. Only when the task ready to send a response, they will post their IO operation to the IO context.

            As you probably know complexity is easier to prevent than it is to achieve simplicity after-the-fact.

            Source https://stackoverflow.com/questions/65951217

            QUESTION

            "Stable" k-largest elements algorithm
            Asked 2020-Oct-06 at 19:54

            Related: priority queue with limited space: looking for a good algorithm

            I am looking for an algorithm which returns the k-largest elements from a list, but does not change the order of the k-largest elements, e.g. for k=4 and given 5,9,1,3,7,2,8,4,6, the algorithm should return 9,7,8,6.

            More background, my input data are approximately 200 pairs (distance,importance) which are ordered w.r.t distance, and I need to select the 32 most important of them. Performance is crucial here, since I have to run this selection algorithm a few thousand times.

            Up to now I have the two following ideas, but both of them seem not to be the best possible.

            1. Remove the minimum element iteratively until 32 elements are left (i.e. do selection sort)
            2. Use quickselect or median-of-medians to search for the 32nd largest element. Afterwards, sort the remaining 31 elements again w.r.t. distance.

            I need to implement this in C++, so if anybody wants to write some code and does not know which language to use, C++ would be an option.

            ...

            ANSWER

            Answered 2020-Oct-06 at 17:05

            Use the heap-based algorithm for finding the k largest value, i.e. use a min heap (not a max heap) that never exceeds a size of k. Once it exceeds that size, keep pulling the root from it to restore it to a size of k.

            At the end the heap's root will be k largest value. Let's call it m.

            You could then scan the original input again to collect all values that are at least equal to m. This way you'll have them in their original order.

            When that m is not unique, you could have collected too many values. So check the size of the result and determine how much longer it is than k. Go backwards through that list and mark the ones that have value m as deleted until you have reached the right size. Finally collect the non-deleted items.

            All these scans are O(n). The most expensive step is the first one: O(nlogk).

            Source https://stackoverflow.com/questions/64229488

            QUESTION

            priority_queue with custom comparator as value in map constructor error
            Asked 2020-Sep-24 at 15:41

            I have created a priority_queue with custom comparator which stores string in lexicographically sorted order, and it works as expected.[ Ref. this] ]

            Now, I want it to be value in an unordered_map, and I got error: no matching constructor for initialization ... and closest thing I found is this. I realize I need to pass the comparator to the constructor as well, but how?

            Here is my code as of now :

            ...

            ANSWER

            Answered 2020-Sep-24 at 15:12

            Maps use the default constructor when creating new elements. You could use pointers, but you’d need to allocate each new entry:

            Source https://stackoverflow.com/questions/64049187

            Community Discussions, Code Snippets contain sources that include Stack Exchange Network

            Vulnerabilities

            No vulnerabilities reported

            Install priority-queue

            You can download it from GitHub.
            Rust is installed and managed by the rustup tool. Rust has a 6-week rapid release process and supports a great number of platforms, so there are many builds of Rust available at any time. Please refer rust-lang.org for more information.

            Support

            Feel free to contribute to this project with pull requests and/or issues. All contribution should be under a license compatible with the GNU LGPL and with the MPL.
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