priority-queue

I just started to learn C++, Half of the time I don't know what am I doing, spend hours and hours searching on Google and blindly put codes inside my project, this might be a basic question, but I just can't seems to get it right. This is the requirement of my assignment, I need to have these: in the Edge class: public: bool operator()(Edge*, Edge*) in the Graph class: private: priority_queue<Edge*, vector<Edge*>, Edge> edges I have problem declaring the priority_queue. Details: If I directly use these, the edge class will give me an error of "must have an argument of class", I understand that

In a (max) heap it is easy to find the biggest item in O(1) time, but to actually remove it you need complexity of O(log(n)) . So if the insertion and deletion from a heap is both O(log(n)) , what are the advantages of a heap over binary tree for representing a priority queue? Heaps use less memory. They can be implemented as arrays and thus there is no overhead for storing pointers. (A binary tree CAN be implemented as an array, but there is likely to be many empty "gaps" which could waste even more space than implementing them as nodes with pointers). Heaps are guaranteed to have height of

I am working on a building a discrete event simulator. Wikipedia mentioned that there are several general purpose priority queues that are good for use in DES's. Specifically, it mentions that a Calendar Queue is a good structure. I found one pdf (from 1988) that mentions Calendar Queues, but for the most part I can't find anything else out about them. Would someone mind explaining what Calendar Queue's are, how they're used, and where I might find a sample implementation? A Google search finds Study of Optimised bucket widths in Calendar Queue for Discrete Event Simulator http://pioneer

This question already has answers here : The built-in iterator for java's PriorityQueue does not traverse the data structure in any particular order. Why? (5 answers) I was trying to insert the integers in PriorityQueue , and I know that : If no comparator is specified when a PriorityQueue is constructed, then the default comparator for the type of data stored in the queue is used. The default comparator will order the queue in ascending order However, the output I am getting is not in sorted order. Output after running the below code is : [2, 4, 8, 6] public static void main(String args[]) {

How can we use STL priority_queue for struct ? Any illustration of pushing & popping , where struct has multiple data-types? Say : struct thing { int a; char b;} glass[10]; . Now how can i put this struct on priority_queue using 'int a' for ordering ? juanchopanza Here is a slightly modified answer to your original question, which you deleted for no apparent reason. The original contained enough information for you to figure this out, but here it goes: provide a less than comparison that uses the int for comparison. All you need to do is provide a functor that implements a less-than comparison

Priority Queues have a priority value and data, for every entry. Thus, when adding a new element to the queue, it bubbles up to the surface if it has a higher priority value than elements already in the collection. When one calls pop, we get the data for the element with highest priority. What is an efficient implementation of such a priority queue in Javascript? Does it make sense to have a new object called PriorityQueue, create two methods (push and pop) that take two params (data, priority)? That much makes sense to me as a coder, but I'm uncertain of which data structure to use in the