优先队列（priority_queue）自定义排序方法

#include<iostream>
#include<vector>
#include<queue>
using namespace std;
struct cmp{
	 
	    bool  operator ()  ( int  r , int  l  ){
	   	      return r > l;
	   } 
}; 
struct cmp1{
	   bool operator ()( int a ,int b ){
	   	   return a<b;
	   }
};
int  main(void){
	 
	
	 //   priority_queue< int > q;// 默认是 从大到小。 
	 //   priority_queue < int , vector<int> ,less<int> > q;//从大到小 
	 //   priority_queue < int , vector<int>, greater<int> > q; //从小到大
	 //  priority_queue < int , vector<int> , cmp1  > q;//从大到小
	 //   priority_queue < int , vector<int> , cmp  > q;//从小到大
	 q.push( 1 );
	 q.push( 2 );
	 q.push( 3 );
	 
	 while( !q.empty() ){
	      int t =q.top();
	     q.pop();
	     printf("%d ",t);
	  
	 } 
	  return 0;
}