Kattis Challenge "Parking"

 1import java.util.Scanner;
 2public class Parking {
 3    public static void main(String[] args) {
 4        Scanner sc = new Scanner(System.in);
 5        int t = sc.nextInt();
 6        for (int i = 0; i < t; i++) {
 7            int n = sc.nextInt();
 8            int high = 0;
 9            int low = 100;
10            int d = 0;
11            for (int j = 0; j < n; j++) {
12                int s = sc.nextInt();
13                if (s > high) {
14                    high = s;
15                }
16                if (s < low) {
17                    low = s;
18                }
19                d = (high - low) * 2;
20            }
21            System.out.println(d);
22        }
23    }
24}