A12321 | Ж-function

The length of the longest common prefix of two strings $s=s_1 s_2 \ldots s_n$ and $t = t_1 t_2 \ldots t_m$ is defined as the maximum $k \le \min(n, m)$ such that $s_1 s_2 \ldots s_k$ equals $t_1 t_2 \ldots t_k$ . Let's denote the longest common prefix of two strings $s$ and $t$ as $lcp(s,t)$ .

Z-function of a string $s_1 s_2 \dots s_n$ is a sequence of integers $z_1, z_2, \ldots, z_n$ , where $z_i = lcp(s_1 s_2 \ldots s_n,\ \ s_i s_{i+1} \dots s_n)$ . Ж-function of a string $s$ is defined as $z_1 + z_2 + \ldots + z_n$ .

You're given a string $s=s_1 s_2 \ldots s_n$ and $q$ queries. Each query is described by two integers $l_i$ and $r_i$ , where $1 \le l_i \le r_i \le n$ . The answer for the query is defined as Ж-function of the string $s_{l_i} s_{l_i +1} \ldots s_{r_i}$ .

The first line contains the string $s$ , consisting of lowercase English letters ( $1 \leq |s| \leq 200\,000$ ). The second line contains one integer $q$ — the number of queries ( $1 \leq q \leq 200\,000$ ). Each of the following $q$ lines contains two integers $l_i$ and $r_i$ , describing the query ( $1 \leq l_i \leq r_i \leq |s|$ ).

For every query output one integer: the value of Ж-function of the corresponding substring.