A12438 | Recursive Queries

You are given a permutation $p_1, p_2, \dots, p_n$ . You should answer $q$ queries. Each query is a pair $(l_i, r_i)$ , and you should calculate $f(l_i, r_i)$ .

Let's denote $m_{l, r}$ as the position of the maximum in subsegment $p_l, p_{l+1}, \dots, p_r$ .

Then $f(l, r) = (r - l + 1) + f(l, m_{l,r} - 1) + f(m_{l,r} + 1, r)$ if $l \le r$ or $0$ otherwise.

The first line contains two integers $n$ and $q$ ( $1 \le n \le 10^6$ , $1 \le q \le 10^6$ ) — the size of the permutation $p$ and the number of queries.

The second line contains $n$ pairwise distinct integers $p_1, p_2, \dots, p_n$ ( $1 \le p_i \le n$ , $p_i \neq p_j$ for $i \neq j$ ) — permutation $p$ .

The third line contains $q$ integers $l_1, l_2, \dots, l_q$ — the first parts of the queries.

The fourth line contains $q$ integers $r_1, r_2, \dots, r_q$ — the second parts of the queries.

It's guaranteed that $1 \le l_i \le r_i \le n$ for all queries.

Print $q$ integers — the values $f(l_i, r_i)$ for the corresponding queries.