priority-queue

问题 When configured for mutability, boost::heap::d_ary_heap uses a std::list in addition to the vector that holds the values of the heap nodes. I realize that the handles which are being provided for making the mutable_heap_interface work are in fact iterators of this list, but I'm wondering why such an expensive solution was chosen, and if there's a leaner way to achieve mutability with boost::heap::d_ary_heap . Mutability requires a way to find the index of a node in the heap vector, given the

问题 When configured for mutability, boost::heap::d_ary_heap uses a std::list in addition to the vector that holds the values of the heap nodes. I realize that the handles which are being provided for making the mutable_heap_interface work are in fact iterators of this list, but I'm wondering why such an expensive solution was chosen, and if there's a leaner way to achieve mutability with boost::heap::d_ary_heap . Mutability requires a way to find the index of a node in the heap vector, given the

问题 When configured for mutability, boost::heap::d_ary_heap uses a std::list in addition to the vector that holds the values of the heap nodes. I realize that the handles which are being provided for making the mutable_heap_interface work are in fact iterators of this list, but I'm wondering why such an expensive solution was chosen, and if there's a leaner way to achieve mutability with boost::heap::d_ary_heap . Mutability requires a way to find the index of a node in the heap vector, given the

问题 I am using a priorityQueue to implement BFS. I want to maintain the insertion order in the case of equal priority while inserting and also after poping. I overrode the equals method as shown below and the insertion order is maintained as expected while inserting. But, once I do a remove or poll, the order of the elements changes. How can I maintain the insertion order even on poll? class Cell implements Comparable<Cell>{ int v; int dis; public Cell(int v, int dis) { this.v = v; this.dis = dis

问题 I am having a hard time with a data-structure related problem. I've tried quite a lot recently, but I don't know how to proceed. The problem is that I have the right output, but the timing is too slow and I don't pass the automated tests. To solve the problem, I am using a min-heap to implement the priority queue with next free times for the workers -- how could I make it more efficient? Efficiency is critical here. Task description You have a program which is parallelized and uses m

问题 I was looking through some STL documentation. I see that the syntax for a priority queue which stores in a descending order is: std::priority_queue<int> q ; //gives 9 8 7 6 5 4 3 2 1 when pushed and obtained However, for storing in an ascending fashion, it's: std::priority_queue< int, std::vector<int>, std::greater<int> > q ; //gives 1 2 3 4 5 6 7 8 9 when pushed and obtained I want to know what are the specific uses of the extra template parameters in the second example. As in, what does std

问题 I was looking through some STL documentation. I see that the syntax for a priority queue which stores in a descending order is: std::priority_queue<int> q ; //gives 9 8 7 6 5 4 3 2 1 when pushed and obtained However, for storing in an ascending fashion, it's: std::priority_queue< int, std::vector<int>, std::greater<int> > q ; //gives 1 2 3 4 5 6 7 8 9 when pushed and obtained I want to know what are the specific uses of the extra template parameters in the second example. As in, what does std

问题 I have a vector of priority_queue s of string s: vector<priority_queue<string>>> queues(VECTOR_CAPACITY); And the question is how can I apply custom string comparator to those priority_queue s? Should this be relevant, the comparator I want puts shorter strings before longer ones and when they're equal length uses standard strings comparison. I tried this way: auto comparator = [] (string s1, string s2) { return s1.length() < s2.length() || s1 < s2; }; vector<priority_queue<string, vector

问题 Hey I'm new to coding and I've kind of gotten a hold of Java 8's Lambda functions but I'm trying to convert some of the code I wrote to Java 7 for a project in school and I can't wrap my head around how to make this piece of code identical in functionality but in java 7. Sorry if this is a dumb questions but I can't seem to figure it out. Do I write a custom method and then apply it to the my PriorityQueue. open = new PriorityQueue<>((Object o1, Object o2) -> { Cell c1 = (Cell)o1; Cell c2 =

来源： https://stackoverflow.com/questions/41652194/c-priority-queue-does-not-respect-fifo-order