priority_queue 优先队列用法

//采用默认优先关系:
//(priority_queue<int>que;)
//Queue 0:
// 91 83 72 56 47 36 22 14 10  7  3
//
//采用结构体自定义优先级方式一:
//(priority_queue<int,vector<int>,cmp>que;)
//Queue 1:
//  3  7 10 14 22 36 47 56 72 83 91
//Queue 2:
// 91 83 72 56 47 36 22 14 10  7  3
//
//采用头文件"functional"内定义优先级：
//(priority_queue<int, vector<int>,greater<int>/less<int> >que;)
//Queue 3:
//  3  7 10 14 22 36 47 56 72 83 91
//Queue 4 :
// 91 83 72 56 47 36 22 14 10  7  3
//
//采用结构体自定义优先级方式二:
//(priority_queue<number>que)
//Queue 5:
//  3  7 10 14 22 36 47 56 72 83 91
//Queue 6:
// 91 83 72 56 47 36 22 14 10  7  3

#include <iostream>
#include <functional>
#include <stdio.h>
#include <queue>
#include <vector>
#include <stdlib.h>
using namespace std;

struct cmp1
{
    bool operator () (int &a, int &b)
    {
        return a > b ;              // 从小到大排序，值 小的 优先级别高
    }
};

struct cmp2
{
    bool operator () (int &a, int &b)
    {
        return a < b;             // 从大到小
    }
};

struct number1
{
    int x;
    bool operator < (const number1 &a)const
    {
        return x > a.x;         // 从小到大  ，x 小的 优先级别高
    }
};

struct number2
{
    int x;
    bool operator < (const number2 &a)const
    {
        return x < a.x;            // 从大到小  ，x 大的优先级别高
    }
};

int a[] = {14,10,56,7,83,22,36,91,3,47,72,0};
number1 num1[] = {14,10,56,7,83,22,36,91,3,47,72,0};
number2 num2[] = {14,10,56,7,83,22,36,91,3,47,72,0};

int main()
{
    priority_queue<int>que;  // 采用默认优先级构造队列  从大到小。

    priority_queue<int, vector<int>, cmp1 >que1;
    priority_queue<int, vector<int>, cmp2 >que2;

    priority_queue<int, vector<int>, greater<int> > que3;  //functional 头文件自带的
    priority_queue<int, vector<int>, less<int> > que4;      //functional 头文件自带的

    priority_queue<number1> que5;
    priority_queue<number2> que6;

    int i;
    for(i=0; a[i]; i++)
    {
        que.push(a[i]);
        que1.push(a[i]);
        que2.push(a[i]);
        que3.push(a[i]);
        que4.push(a[i]);

    }

    for(i=0; num1[i].x; i++)
        que5.push(num1[i]);
    for(i=0; num2[i].x; i++)
        que6.push(num2[i]);

    printf("采用默认优先关系:\n(priority_queue<int>que;)\n");
    printf("Queue 0:\n");
    while(!que.empty())
    {
        printf("%3d",que.top());
        que.pop();
    }
    puts("");
    puts("");

    printf("采用结构体自定义优先级方式一:\n(priority_queue<int,vector<int>,cmp>que;)\n");
    printf("Queue 1:\n");
    while(!que1.empty())
    {
        printf("%3d",que1.top());
        que1.pop();
    }
    puts("");

    printf("Queue 2:\n");
    while(!que2.empty())
    {
        printf("%3d",que2.top());
        que2.pop();
    }
    puts("");
    puts("");

    printf("采用头文件\"functional\"内定义优先级：\n(priority_queue<int, vector<int>,greater<int>/less<int> >que;)\n");
    printf("Queue 3:\n");
    while(!que3.empty())
    {
        printf("%3d",que3.top());
        que3.pop();
    }
    puts("");

    printf("Queue 4 :\n");
    while(!que4.empty())
    {
        printf("%3d",que4.top());
        que4.pop();
    }
    puts("");
    puts("");

    printf("采用结构体自定义优先级方式二:\n(priority_queue<number>que)\n");
    printf("Queue 5:\n");
    while(!que5.empty())
    {
        printf("%3d",que5.top());
        que5.pop();
    }
    puts("");

    printf("Queue 6:\n");
    while(!que6.empty())
    {
        printf("%3d",que6.top());
        que6.pop();
    }

    system("pause");
    return 0;
}