Problem:
Score : 400 points

Problem Statement

You are given N integers; the i-th of them is A_i.
Find the maximum possible sum of the absolute differences between the adjacent elements after arranging these integers in a row in any order you like.

Constraints

2 \leq N \leq 10^5

1 \leq A_i \leq 10^9

All values in input are integers.

Input

Input is given from Standard Input in the following format:

N
A_1
:
A_N

Output

Print the maximum possible sum of the absolute differences between the adjacent elements after arranging the given integers in a row in any order you like.

Sample Input 1

5
6
8
1
2
3

Sample Output 1

21

When the integers are arranged as 3,8,1,6,2, the sum of the absolute differences between the adjacent elements is |3 - 8| + |8 - 1| + |1 - 6| + |6 - 2| = 21. This is the maximum possible sum.

Sample Input 2

6
3
1
4
1
5
9

Sample Output 2

25

Sample Input 3

3
5
5
1

Sample Output 3

8

Solution in Python (3.4.3) (judge verdict: Accepted)

# coding: utf-8
# Your code here!

n=int(input())
a=[]
for _ in range(n):
    a.append(int(input()))

a.sort()

#print(a)    


ans=0

if n%2==0:
    for i in range(n//2-1):
        ans += 2*(a[n-1-i]-a[i])
    ans += a[n//2] - a[n//2-1]

if n%2==1:
    for i in range(n//2-1):
        ans += 2*(a[n-1-i]-a[i])
    ans += max(a[n//2+1] + a[n//2] - 2*a[n//2-1], 2*a[n//2+1] - a[n//2] - a[n//2-1])

print(ans)