201612-1 中间数

#include <iostream>
using namespace std;
const int N = 1010;
int n;
int q[N];
int main()
{
    cin >> n;
    for (int i = 0; i < n; i ++ ) cin >> q[i];
    for (int i = 0; i < n; i ++ )
    {
        int d = 0, u = 0;       //d是down的缩写，u是up的缩写，分别代表小于这个数的个数和大于这个数的个数
        for (int j = 0; j < n; j ++ )
            if (q[j] < q[i]) d ++ ;
            else if (q[j] > q[i]) u ++ ;
        if (u == d)
        {
            cout << q[i] << endl;
            return 0;
        }
    }
    puts("-1");
    return 0;
}