DQUERY  Dquery
English  Vietnamese 
Given a sequence of n numbers a_{1}, a_{2}, ..., a_{n} and a number of dqueries. A dquery is a pair (i, j) (1 ≤ i ≤ j ≤ n). For each dquery (i, j), you have to return the number of distinct elements in the subsequence a_{i}, a_{i+1}, ..., a_{j}.
Input
 Line 1: n (1 ≤ n ≤ 30000).
 Line 2: n numbers a_{1}, a_{2}, ..., a_{n} (1 ≤ a_{i} ≤ 10^{6}).
 Line 3: q (1 ≤ q ≤ 200000), the number of dqueries.
 In the next q lines, each line contains 2 numbers i, j representing a dquery (1 ≤ i ≤ j ≤ n).
Output
 For each dquery (i, j), print the number of distinct elements in the subsequence a_{i}, a_{i+1}, ..., a_{j} in a single line.
Example
Input 5 1 1 2 1 3 3 1 5 2 4 3 5 Output 3 2 3
hide comments
cjn2007:
20211102 08:25:51
Binary Indexed Tree with off line algorithms.


darksun:
20211101 10:33:18
Can anyone tell me the solution using Binary indexed trees ? 

sicho_mohit:
20210728 08:23:18
If you want to solve this using segment tree.


hackerbhaiya:
20210623 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. 

prakrat:
20210615 00:05:33
Solved using MO's 

omar622:
20210522 00:19:50
AC with MO algorithm 
Added by:  Jimmy 
Date:  20081026 
Time limit:  1s1.5s 
Source limit:  50000B 
Memory limit:  1536MB 
Cluster:  Cube (Intel G860) 
Languages:  All except: ERL JSRHINO NODEJS PERL6 VB.NET 
Resource:  Minesweeper 