A9251 | Jeff and Removing Periods

Cosider a sequence, consisting of $n$ integers: $a_{1}$ , $a_{2}$ , $...$ , $a_{n}$ . Jeff can perform the following operation on sequence $a$ :

- take three integers $v$ , $t$ , $k$ $(1<=v,t<=n; 0<=k; v+tk<=n)$ , such that $a_{v}$ = $a_{v+t}$ , $a_{v+t}$ = $a_{v+2t}$ , $...$ , $a_{v+t(k-1)}$ = $a_{v+tk}$ ;
- remove elements $a_{v}$ , $a_{v+t}$ , $...$ , $a_{v+t·k}$ from the sequence $a$ , the remaining elements should be reindexed $a_{1},a_{2},...,a_{n-k-1}$ .
- permute in some order the remaining elements of sequence $a$ .

A beauty of a sequence $a$ is the minimum number of operations that is needed to delete all elements from sequence $a$ .

Jeff's written down a sequence of $m$ integers $b_{1}$ , $b_{2}$ , $...$ , $b_{m}$ . Now he wants to ask $q$ questions. Each question can be described with two integers $l_{i},r_{i}$ . The answer to the question is the beauty of sequence $b_{li}$ , $b_{li}+1$ , $...$ , $b_{ri}$ . You are given the sequence $b$ and all questions. Help Jeff, answer all his questions.

The first line contains integer $m$ $(1<=m<=10^{5})$ . The next line contains $m$ integers $b_{1}$ , $b_{2}$ , $...$ , $b_{m}$ $(1<=b_{i}<=10^{5})$ .

The third line contains integer $q$ $(1<=q<=10^{5})$ — the number of questions. The next $q$ lines contain pairs of integers, $i$ -th of them contains a pair of integers $l_{i}$ , $r_{i}$ $(1<=l_{i}<=r_{i}<=m)$ — the description of $i$ -th question.

In $q$ lines print the answers to Jeff's queries. Print the answers according to the order of questions in input.