pqueue | Priority Queue in pure Ruby
kandi X-RAY | pqueue Summary
kandi X-RAY | pqueue Summary
PQueue is a priority queue with array based heap. A priority queue is like a standard queue, except that each inserted element is given a certain priority, based on the result of the comparison block given at instantiation time. Also, retrieving an element from the queue will always return the one with the highest priority (see #pop and #top). The default is to compare the elements in respect to their #<=> method. For example, Numeric elements with higher values will have higher priorities. This library is a rewrite of the original PQueue.rb by K. Kodama and Heap.rb by Ronald Butler. The two libraries were later merged and generally improved by Olivier Renaud. Then the whole library rewritten by Trans using the original as a functional reference.
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QUESTION
I have a pool of threads (QueueWorkers class) in my program that are released using this logic:
ANSWER
Answered 2021-Jun-07 at 13:52Are sure the thread is in a cancelation or your thread cancelation_type is asynchronous?
From man of pthread_cancel:
A thread's cancellation type, determined by pthread_setcanceltype(3), may be either asynchronous or deferred (the default for new threads). Asynchronous cancelability means that the thread can be canceled at any time (usually immediately, but the system does not guarantee this). Deferred cancelability means that cancellation will be delayed until the thread next calls a function that is a cancellation point. A list of functions that are or may be cancellation points is provided in pthreads(7).
I don't think canceling threads is the best ways to make sure that a thread will finish. Perhaps you can send the thread a message that it should stop and make sure the thread does receive the message and will handle it.
QUESTION
I tried to implement Dijkstra algorithm with adjacency list,the code is exhibiting strange behaviour when i remove the cout statement from updatePriority() function it throws segmentation core dumped error and if the cout statement is included it doesn't throw any error, everything working fine.
what might be the cause for it ?
i have included my code below thank you..
...ANSWER
Answered 2021-Jun-06 at 14:05There is an error in enqueue in this line:
QUESTION
I am writing a simple program using priority queue in which I am adding elements to it, I am not getting how it is sorting the elements internally(java doc says it's based on natural sorting order but how ?).
Java code :
PriorityQueue pQueue = new PriorityQueue();
...ANSWER
Answered 2021-Apr-11 at 09:19You got it right but partially as you have missed the first part of it.
An unbounded priority queue based on a priority heap. The elements of the priority queue are ordered according to their natural ordering, or by a Comparator provided at queue construction time, depending on which constructor is used.
AS you can see it's clearly mentioned that it is based on priority heap. Now if you would like to understand what is Heap you can refer Binary Heap or in one line if you wanna understand basically there are 3 types of Heap -> Min & Map. Java's priority queue is using Min Heap, in this case
the key at root must be minimum among all keys present in Binary Heap and the same property must be recursively true for all nodes in the same tree
To implement this java use bit shifting also:
QUESTION
I build an executable with cx_Freeze. I always read that I need to include multiprocessing.freeze_support to avoid multiple tasks of the executable running in the task manager. But if I use multiprocessing and freeze_support I still get two tasks running in the task manager.
Here is my example GUI named test_wibu.py:
ANSWER
Answered 2021-Apr-07 at 12:07According to this excellent answer, the reason for the multiprocessing.freeze_support() call is
lack of
fork()on Windows (which is not entirely true). Because of this, on Windows the fork is simulated by creating a new process in which code, which on Linux is being run in child process, is being run.
and thus not to avoid multiple tasks of the executable running in the task manager as stated in your premise.
Therefore, the behavior you observe in the task manager is probably normal and can't be avoided.
QUESTION
I have two classes. Class Algorithm implements a method findIntersections() which is a sweep line algorithm to check for intersections in O(nLogN) time.
It also implements a function addSegments which adds objects of type Segment (two points) to a priority Queue based on the x coordinate.
ANSWER
Answered 2020-Oct-23 at 08:47First of all, it is crucial to know that assigning an existing object to another variable does not create a copy of the original object:
QUESTION
Yes before you close this thread I have read all the same question threads saying I need to add hamcrest to classpath. I don't understand what that means or how to do it. I have JDK 14 and don't know why I'm having random problems now. I just want to do JUnit testing.
ANSWER
Answered 2020-Jun-09 at 20:33Try out following jar hamcrest-2.2.jar - https://search.maven.org/search?q=g:org.hamcrest
QUESTION
I was working on a leetcode question where we need to design the basic twitter functionality , such as follow and unfollow , post a tweet and newsfeed which will give the most recent 10 tweets for a user
postTweet(userId, tweetId): Compose a new tweet. getNewsFeed(userId): Retrieve the 10 most recent tweet ids in the user's news feed. Each item in the news feed must be posted by users who the user followed or by the user herself. Tweets must be ordered from most recent to least recent. follow(followerId, followeeId): Follower follows a followee. unfollow(followerId, followeeId): Follower unfollows a followee.
...ANSWER
Answered 2020-Sep-06 at 09:45If I understand your strategy correctly:
QUESTION
I have a broad scrapy crawler which takes a csv file of about 20,000 rows. The file has a name, start_url and allowed domain column. See below:
...ANSWER
Answered 2020-Apr-28 at 04:34You cannot assign allowed_domain for each link in start_urls
You will have to filter urls inside process_request method of DownloaderMiddleware
Here is your Spider code
QUESTION
Bit of a strange issue here. Currently I have an activity which gets the names and place ids of all the taxi companies using Google Places Search API and places them into a list view. Then when the item is clicked it will take the place id and run the Places Details API to fetch the phone number.
Currently I am running into the issue where the first time the item is clicked in the list view the JSON parser will return a NULL and the phone will dial a number like 6855 or 685-5. If you go back and click on the same item or another item then the phone number will fetch correctly.
In the activity I am running 2 JSON parsers however they run at different times.
onCreate:
...ANSWER
Answered 2020-Apr-21 at 23:33It is because, your number is null by the time you return "number". You are not waiting until the api call is complete. It is better you implement a callback when you get the response to perform specific action.
QUESTION
void *returnMin(PQueue q){
if (q.list == NULL){
printf("List is empty.\n");
} else if (q.list->head == NULL){
printf("List is empty.\n");
} else {
return q.list->head;
}
}
ANSWER
Answered 2020-Apr-16 at 18:06Your function returns a pointer. Since the function returns something, and that something is likely being used somewhere else in your code, it must return a value in any possible case. Your function however does not do this, since only the last branch has a return statement. If you somehow enter if (q.list == NULL) you have no return statement to execute.
To fix this, return something meaningful (NULL is a good choice to indicate an error):
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Install pqueue
On a UNIX-like operating system, using your system’s package manager is easiest. However, the packaged Ruby version may not be the newest one. There is also an installer for Windows. Managers help you to switch between multiple Ruby versions on your system. Installers can be used to install a specific or multiple Ruby versions. Please refer ruby-lang.org for more information.
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