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How does Priority queue compare and store the values during the push operation?


How does Priority queue compare and store the values during the push operation?

By : William Neel
Date : November 19 2020, 03:59 PM
Hope that helps A priority queue is commonly implemented as a perfectly balanced heap structure. The heap can be seen as a binary tree with the only requirement that the priority of the root is higher(smaller value for your comparator) than its children, the heap condition.
code :
                root
      Lchild1             Rchild1
  Lchild2  Rchild2     Lchild2  empty
                root(2)
      Lchild1(4)        empty.
                root(2)
      Lchild1(4)        Rchild1(8).
   empty


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How would i pop and push with this priority queue?

How would i pop and push with this priority queue?


By : user3754447
Date : March 29 2020, 07:55 AM
With these it helps There will be a lot data copy when you push a new job. keep that in mind. You have to overload the operator < for Job or specialize the template less.
Try this:
code :
    class Job
{
public:
    int job_id;
    string job_description;
    int n_procs;    
    int n_ticks;


    Job(int job_id, string job_description, int n_procs, int n_ticks);
    Job(void);
    ~Job(void);
};


bool operator < (Job const& rhs, Job const& lhs)
{
    return rhs.n_ticks < lhs.n_ticks;
}

typedef vector<Job> Jobs;
typedef priority_queue<Job, Jobs, less<Job>> JobQueue;


Job job(1,"job 1", 1,2);
JobQueue jobs;

jobs.push(job);

Job const& topJop = jobs.top();
//do whatever with topTob
//remove it from the queue
job.pop();
SQL priority queue operation - any pitfalls?

SQL priority queue operation - any pitfalls?


By : Rd Hilman Hermarian
Date : March 29 2020, 07:55 AM
I hope this helps . The SELECT / UPDATE combination listed seems to address the concrrency issue with the UPDATE's WHERE clause. I would however lean toward a stored procedure if that were acceptable: depending on the sql flavour, the stored proc could get rid of the concurrency problem with an atomic "UPDATE ... RETURNING id INTO... ".
Regarding the states, if they are something like:
Priority queue, overloading less operation

Priority queue, overloading less operation


By : Hector Romero Brand
Date : March 29 2020, 07:55 AM
may help you . Check out this reference. By default, the top element is the largest element. If you want opposite behavior, you must use different comparison function, just as you've done.
Javascript priority queue with decrease key operation

Javascript priority queue with decrease key operation


By : user2954977
Date : November 22 2020, 10:33 AM
this one helps. I found out the following resource for exactly what I have been looking for:
https://github.com/rombdn/js-binaryheap-decreasekey
C++ Priority Queue with Custom Compare Function not Behaving Correctly on Push()

C++ Priority Queue with Custom Compare Function not Behaving Correctly on Push()


By : Shifali Sharma
Date : March 29 2020, 07:55 AM
it fixes the issue This error has nothing to do with your custom comparison. You get the same error if you do this:
code :
std::priority_queue<int> q;
std::vector<int> v;
q.push(v);
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