3307: Jeff and Removing Periods
Description
Cosider a sequence, consisting of n integers: a1, a2, ..., an. 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 av = av+t, av+t = av+2t, ..., av+t(k-1) = av+tk;
- remove elements av, av+t, ..., av+t·k from the sequence a, the remaining elements should be reindexed a1,a2,...,an-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 b1, b2, ..., bm. Now he wants to ask q questions. Each question can be described with two integers li,ri. The answer to the question is the beauty of sequence bli, bli+1, ..., bri. You are given the sequence b and all questions. Help Jeff, answer all his questions.
The first line contains integer m (1≤m≤105). The next line contains m integers b1, b2, ..., bm (1≤bi≤105).
The third line contains integer q (1≤q≤105) − the number of questions. The next q lines contain pairs of integers, i-th of them contains a pair of integers li, ri (1≤li≤ri≤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.
5
2 2 1 1 2
5
1 5
1 1
2 2
1 3
2 3
2
1
1
2
2
10
2 1 3 3 3 3 1 3 1 1
10
4 8
2 10
1 10
4 4
1 3
2 4
6 7
1 9
2 5
1 1
2
3
3
1
3
2
2
3
2
1