STL之优先级队列priority_queue

摘要:

  priority_queue,自适应容器(即容器适配器):不能由list来组建;

  最大值优先级队列(最大值始终在对首,push进去时候)

  最小值优先级队列;

  优先级队列适配器 STL  priority_queue

  priority_queue<int, deque<int> > pg;

  priority_queue<int, vector<int> > pg;

  STL中实现的方法:

    pg.empty();

    pg.size();

    pg.top();  //查看队首的元素

    pg.pop();  //从队首删除元素;

    pg.push(item);  //从队尾加入元素

 1 #include <iostream>
 2 #include <queue>
 3 
 4 using namespace std;
 5 int main()
 6 {
 7     //最大值有限队列, 会进行自动排序
 8     priority_queue<int, vector<int> > pg; 
 9     priority_queue<int, deque<int> >  pg2;
10     //priority_queue<int> pg3;
11     
12     pg.push(10);
13     pg.push(5);
14     pg.push(-1);
15     pg.push(20);
16     
17     std::cout <<"priority_queue first item: " << pg.top() << std::endl;
18     while(!pg.empty()){
19         std::cout<<"priority_queue del item: " << pg.top() << std::endl;
20         pg.pop();
21     }   
22     //最小值有限队列,从小到大排序
23     priority_queue<int, deque<int>, greater<int> > pg3;
24     pg3.push(10);
25     pg3.push(5);
26     pg3.push(-1);
27     pg3.push(20);
28     std::cout <<"priority_queue first item: " << pg3.top() << std::endl;
29     while(!pg3.empty()){
30         std::cout<<"priority_queue del item: " << pg3.top() << std::endl;
31         pg3.pop();
32     }
33 
34     return 0;
35 }

 

 

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