除数的话要用double保存 题目要看清楚 每一个字都要看仔细
import java.util.Arrays;
import java.util.Scanner;
public class Main {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
int n = sc.nextInt();
int[] arr = new int[n];
for (int i = 0; i < n; i++)
arr[i] = sc.nextInt();
Arrays.sort(arr);
if (arr.length % 2 == 0) {
String temp = "";
if ((arr[arr.length / 2 - 1] + arr[arr.length / 2]) / 2* 2 != (arr[arr.length / 2 - 1] + arr[arr.length / 2])) {
double d1 = (arr[arr.length / 2 - 1] + arr[arr.length / 2]) * 1.0 / 2;
temp = String.format("%.1f", d1);
} else
temp = (arr[arr.length / 2 - 1] + arr[arr.length / 2]) / 2 + "";
System.out.println(arr[arr.length - 1] + " " + temp + " " + arr[0]);
} else {
int d2 = arr[arr.length / 2] ;
System.out.println(arr[arr.length - 1] + " " + d2 + " " + arr[0]);
}
}
}