DQUERY - D-query

Given a sequence of n numbers a1, a2, ..., an and a number of d-queries. A d-query is a pair (i, j) (1 ≤ i ≤ j ≤ n). For each d-query (i, j), you have to return the number of distinct elements in the subsequence ai, ai+1, ..., aj.

Input

  • Line 1: n (1 ≤ n ≤ 30000).
  • Line 2: n numbers a1, a2, ..., an (1 ≤ ai ≤ 106).
  • Line 3: q (1 ≤ q ≤ 200000), the number of d-queries.
  • In the next q lines, each line contains 2 numbers i, j representing a d-query (1 ≤ i ≤ j ≤ n).

Output

  • For each d-query (i, j), print the number of distinct elements in the subsequence ai, ai+1, ..., aj in a single line.

     

Example

Input
5
1 1 2 1 3
3
1 5
2 4
3 5

Output
3
2
3 


Added by:Jimmy
Date:2008-10-26
Time limit:1s-1.5s
Source limit:50000B
Memory limit:1536MB
Cluster: Cube (Intel G860)
Languages:All except: ERL JS-RHINO NODEJS PERL6 VB.NET
Resource:Minesweeper

hide comments
2021-11-02 08:25:51
Binary Indexed Tree with off line algorithms.
AC in one go :)
2021-11-01 10:33:18
Can anyone tell me the solution using Binary indexed trees ?
2021-07-28 08:23:18
If you want to solve this using segment tree.
Here are some of the hints.
HINT 1:Iterating the array for i=0;i<n;
HINT 2:Think treating each i as an R(right range) of a query(l,r).
HINT 3:Try considering all the ranges for that particular i(acting as r) which we have).
HINT 4:Now to maintain distinct elements in that range.



Last edit: 2022-06-01 07:17:56
2021-06-23 20:57:54
AC with square root decomposition on arrays only. No need to use MO here. This problem can be reduced to KQUERY problem on spoj.
2021-06-15 00:05:33
Solved using MO's
2021-05-22 00:19:50
AC with MO algorithm
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