C :

#include<stdio.h>
#define INF 0x7fffffff
int main()
{
	int t,max,min,n,a;
	scanf("%d",&t);
	while(t--)
	{
		scanf("%d",&n);
		max=0,min=INF;
		while(n--)
		{
			scanf("%d",&a);
			if(a>max)max=a;
			if(a<min)min=a;
		}
		printf("%d\n",2*(max-min));
	}
	return 0;
}

C++ :

#include <stdio.h>

int main() {
	int t, n, p, maxi, mini;
	scanf("%d", &t);
	while (t--) {
		scanf("%d", &n);
		maxi = -100000000;
		mini = 100000000;
		while (n--) {
			scanf("%d", &p);
			if (p > maxi)
				maxi = p;
			if (p < mini)
				mini = p;
		}
		printf("%d\n", (maxi - mini) * 2);
	}
	return 0;
}

Java :

import java.util.*;

public class Main{
 final static Scanner jin=new Scanner(System.in);
  public static void main(String args[]){
   int t=jin.nextInt();
    while(t-->0){
     int n=jin.nextInt();
      int m=jin.nextInt();
      int M=m;
      for(int i=1;i<n;i++){
       int x=jin.nextInt();
        if(x<m)m=x;
        if(x>M)M=x;
      }
      System.out.println(2*(M-m));
    }
  }
}