#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;   
}