Problem:
Score : 300 points

Problem Statement

We have two permutations P and Q of size N (that is, P and Q are both rearrangements of (1,~2,~...,~N)).

There are N! possible permutations of size N. Among them, let P and Q be the a-th and b-th lexicographically smallest permutations, respectively. Find |a - b|.

Notes

For two sequences X and Y, X is said to be lexicographically smaller than Y if and only if there exists an integer k such that X_i = Y_i~(1 \leq i < k) and X_k < Y_k.

Constraints

2 \leq N \leq 8

P and Q are permutations of size N.

Input

Input is given from Standard Input in the following format:

N
P_1 P_2 ... P_N
Q_1 Q_2 ... Q_N

Output

Print |a - b|.

Sample Input 1

3
1 3 2
3 1 2

Sample Output 1

3

There are 6 permutations of size 3: (1,~2,~3), (1,~3,~2), (2,~1,~3), (2,~3,~1), (3,~1,~2), and (3,~2,~1). Among them, (1,~3,~2) and (3,~1,~2) come 2-nd and 5-th in lexicographical order, so the answer is |2 - 5| = 3.

Sample Input 2

8
7 3 5 4 2 1 6 8
3 8 2 5 4 6 7 1

Sample Output 2

17517

Sample Input 3

3
1 2 3
1 2 3

Sample Output 3

0

Solution in Python (3.8.2) (judge verdict: Accepted)

def nanbanme(n, x):
    lst = [1 for i in range(n)]
    ans = 0
    for i in range(n):
        a = x[i]
        count = 0
        for j in range(a - 1):
            if (lst[j] == 1):
                count = count + 1
        tmp = 1
        for k in range(1, n - i):
            tmp = tmp*k
        ans = ans + count*tmp
        lst[a - 1] = 0
    return (ans + 1)

n = int(input())
lst1 = list(map(int,input().split()))
lst2 = list(map(int,input().split()))

a = nanbanme(n, lst1)
b = nanbanme(n, lst2)

print(abs(a - b))