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)

n = int(input())
a = [int(input()) for _ in range(n)]
a.sort()
ans = [0]*2
for i in range(n):
    if i%2==0:
        ans[0] -= 2*a[i//2]
    else:
        ans[0] += 2*a[n-1-i//2]
    
    if i%2==0:
        ans[1] += 2*a[n-1-i//2]
    else:
        ans[1] -= 2*a[i//2]
if n%2==0:
    ans[0] +=a[n//2-1]
    ans[0] -=a[n//2]
    ans[1] +=a[n//2-1]
    ans[1] -=a[n//2]
else:
    ans[0] +=a[n//2]
    ans[0] +=a[n//2-1]
    ans[1] -=a[n//2]
    ans[1] -=a[n//2+1]
print(max(ans))