#P1718F. Burenka, an Array and Queries
Burenka, an Array and Queries
Description
Eugene got Burenka an array $a$ of length $n$ of integers from $1$ to $m$ for her birthday. Burenka knows that Eugene really likes coprime integers (integers $x$ and $y$ such that they have only one common factor (equal to $1$)) so she wants to to ask Eugene $q$ questions about the present.
Each time Burenka will choose a subsegment $a_l, a_{l + 1}, \ldots, a_r$ of array $a$, and compute the product of these numbers $p = a_l \cdot a_{l + 1} \cdot \ldots \cdot a_r$. Then she will ask Eugene to count the number of integers between $1$ and $C$ inclusive which are coprime with $p$.
Help Eugene answer all the questions!
In the first line of input there are four integers $n$, $m$, $C$, $q$ ($1 \leq n, q \leq 10^5$, $1 \leq m \leq 2\cdot 10^4$, $1 \leq C \leq 10^5$) — the length of the array $a$, the maximum possible value of $a_{i}$, the value $C$, and the number of queries.
The second line contains $n$ integers $a_1, a_2, \ldots, a_n$ ($1 \leq a_{i} \leq m$) — the array $a$ .
In the next $q$ lines the queries are given. Each query consists of two integers $l$ and $r$ ($1 \leq l \leq r \leq n$).
Print $q$ integers — the answers to Burenka's queries.
Input
In the first line of input there are four integers $n$, $m$, $C$, $q$ ($1 \leq n, q \leq 10^5$, $1 \leq m \leq 2\cdot 10^4$, $1 \leq C \leq 10^5$) — the length of the array $a$, the maximum possible value of $a_{i}$, the value $C$, and the number of queries.
The second line contains $n$ integers $a_1, a_2, \ldots, a_n$ ($1 \leq a_{i} \leq m$) — the array $a$ .
In the next $q$ lines the queries are given. Each query consists of two integers $l$ and $r$ ($1 \leq l \leq r \leq n$).
Output
Print $q$ integers — the answers to Burenka's queries.
Samples
5 5 5 3
1 2 3 2 5
1 1
2 4
4 5
5
2
2
Note
Here's an explanation for the example:
- in the first query, the product is equal to $1$, which is coprime with $1,2,3,4,5$.
- in the second query, the product is equal to $12$, which is coprime with $1$ and $5$.
- in the third query, the product is equal to $10$, which is coprime with $1$ and $3$.