#include<iostream>
#include<algorithm>
using namespace std; 

int main()
{    
    int array[] = {5,6,7,8,4,2,1,3,0}; 
    int len=sizeof(array)/sizeof(int); 
    
    cout<<"排序前: "; 
    for(int i=0; i<len; i++)  
        cout<<array[i]<<" "; 
    nth_element(array, array+6, array+len);  //排序第6个元素  
    
    cout<<endl; cout<<"排序后：";  
    for(int i=0; i<len; i++)  
        cout<<array[i]<<" ";   
        
    cout<<endl<<"第6个元素为"<<array[6]<<endl; 
}