Cut
本题没有可用的提交语言。
Description
This time Baby Ehab will only cut and not stick. He starts with a piece of paper with an array $a$ of length $n$ written on it, and then he does the following:
- he picks a range $(l, r)$ and cuts the subsegment $a_l, a_{l + 1}, \ldots, a_r$ out, removing the rest of the array.
- he then cuts this range into multiple subranges.
- to add a number theory spice to it, he requires that the elements of every subrange must have their product equal to their least common multiple (LCM).
Formally, he partitions the elements of $a_l, a_{l + 1}, \ldots, a_r$ into contiguous subarrays such that the product of every subarray is equal to its LCM. Now, for $q$ independent ranges $(l, r)$, tell Baby Ehab the minimum number of subarrays he needs.
The first line contains $2$ integers $n$ and $q$ ($1 \le n,q \le 10^5$) — the length of the array $a$ and the number of queries.
The next line contains $n$ integers $a_1$, $a_2$, $\ldots$, $a_n$ ($1 \le a_i \le 10^5$) — the elements of the array $a$.
Each of the next $q$ lines contains $2$ integers $l$ and $r$ ($1 \le l \le r \le n$) — the endpoints of this query's interval.
For each query, print its answer on a new line.
Input
The first line contains $2$ integers $n$ and $q$ ($1 \le n,q \le 10^5$) — the length of the array $a$ and the number of queries.
The next line contains $n$ integers $a_1$, $a_2$, $\ldots$, $a_n$ ($1 \le a_i \le 10^5$) — the elements of the array $a$.
Each of the next $q$ lines contains $2$ integers $l$ and $r$ ($1 \le l \le r \le n$) — the endpoints of this query's interval.
Output
For each query, print its answer on a new line.
Samples
6 3
2 3 10 7 5 14
1 6
2 4
3 5
3
1
2
Note
The first query asks about the whole array. You can partition it into $[2]$, $[3,10,7]$, and $[5,14]$. The first subrange has product and LCM equal to $2$. The second has product and LCM equal to $210$. And the third has product and LCM equal to $70$. Another possible partitioning is $[2,3]$, $[10,7]$, and $[5,14]$.
The second query asks about the range $(2,4)$. Its product is equal to its LCM, so you don't need to partition it further.
The last query asks about the range $(3,5)$. You can partition it into $[10,7]$ and $[5]$.