Parking Solution:

import java.util.Scanner;
public class Kattis {
  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    int foo = sc.nextInt();
    for (int i = 0; i < foo; i++) {
      int bar = sc.nextInt();
      int low = 100;
      int high = 0;
      for (int i1 = 0; i1 < bar; i1++) {
        int curr = sc.nextInt();
        if(curr < low)
          low = curr;
        if(curr > high)
          high = curr;
      }
      System.out.println(2 * (high - low));
    }
  }
}