12
12 5 3 11 2 8 4 9 1 6 10 7

answer: 34650  in example output.

But, following full check test prints 6300.

-----
static bool match(int a[], int n, int b[], int m){
    if (n != m) return false;
    if (n == 0 && m == 0) return true;

    int i = std::max_element(a, a + n) - a;
    int j = std::max_element(b, b + m) - b;

    return i == j && match(a, i, b, j) && match(a + i + 1, n - i - 1, b + j + 1, m - j - 1);
}
int main()
{
        int n = 12;
        int a[] = { 12, 5, 3, 11, 2, 8, 4, 9, 1, 6, 10, 7 };
        int b[] = {  1, 2, 3,  4, 5, 6, 7, 8, 9, 10, 11, 12};
        int ans = 0;
        do{
            if (match(a, n, b, n)) ++ ans;

        } while (std::next_permutation(b, b + 12) );

        printf("ans = %d\n", ans);
        return 0;
}