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AC代码：
1 import java.util.Arrays; 2 import java.util.Scanner; 3 4 public class Main { 5 6 public static void main(String[] args) { 7 8 Scanner sc=new Scanner(System.in); 9 10 int times=sc.nextInt(); 11 while(times-->0){ 12 13 int a[]=new int[7]; 14 for(int i=0;i<a.length;i++){ 15 a[i]=sc.nextInt(); 16 } 17 18 Arrays.sort(a); 19 20 double ans=(a[0]+a[3]+a[6])/3.0; 21 System.out.printf("%.2f ",ans); 22 } 23 24 } 25 26 }