CCF|中间数|Java

import java.util.*;

public class tyt
{
public static void main(String[] args)
{
Scanner in = new Scanner(System.in);
int n = in.nextInt();
int[] a=new int[n];

    for (int i = 0; i < n; i++)
    {
        a[i]=(in.nextInt());
    }



    for (int i = 0; i < n; i++)
    {
        int min = 0;
        int max = 0;
        for(int j=0;j<n;j++)
        {
            if (i != j)
            {
                if (a[j] > a[i])
                {
                    max++;
                }
                else if(a[j]<a[i])
                {
                    min++;
                }
            }
        }
        if (min == max)
        {
            System.out.println(a[i]);
            return;
        }
        else if(i==n-1)
        {
            System.out.println(-1);
        }
    }
}

}