19429번 - Order-Preserving Partition 다국어

Bobo has two permutations: $P = \{p_1, p_2, \ldots, p_n\}$ and $Q = \{q_1, q_2, q_3, q_4\}$. He would like to partition $P$ into four non-empty and contiguous parts in such a manner that:

• The numbers in each part can be rearranged to form an interval of values: an increasing sequence where each element is greater than the previous by exactly one.
• For all $1 \leq i < j \leq 4$, $(s_i - s_j) \cdot (q_i - q_j) > 0$ where $s_i$ is the minimum value in the $i$-th part.

Bobo wants to know the number of such partitions. As the number may be very large, you just need to print the answer modulo $(10^9 + 7)$.

The input contains zero or more test cases, and is terminated by end-of-file. For each test case:

The first line contains an integer $n$, the length of the first permutation $(4 \leq n \leq 10^6)$.

The second line contains $n$ integers $p_1, p_2, \dots, p_n$.

The third line contains four integers $q_1, q_2, q_3, q_4$.

It is guaranteed that the sum of all $n$ does not exceed $10^6$.

For each test case, output an integer denoting the answer.