注意C语言里，数组的下标是从0开始的，a[5]这个数组中的中间元素是a[2],不是a[3].

Source

Problem Id:2388  User Id:Sempr 
Memory:116K  Time:76MS
Language:C++  Result:Accepted

Source 

#include<iostream>
#include<fstream>
#include<algorithm>
#define MAXN 10000
using namespace std;
int main()
{
   
   long int milk[MAXN], N;
   long int result;
   int i;
   while(cin>>N)
   {
	   for(i=0;i<N;i++)
		   cin>>milk[i];
	   result=N/2;
	   nth_element(milk, milk + result, milk + N);
	   cout<<milk[result]<<endl;
   }
   return 0;
}