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HNUMBERS - HNumbers |
Note: Some tricky test cases were added on Feb. 26th, 2013 and time limit has been changed. All the solutions have been rejudged and some "Accepted" ones got Wrong Answer / Time Limit Exceeded. However, this problem can still be solved by a simple and beautiful solution :)
Ualter is a smart guy, and he loves mathematics and everything related to numbers. Recently his friend Matheus Pheverso showed him a group of H-numbers. Also, his friend told him that, in the Ancient Greek, there H-numbers would be used to create music. This group of numbers can be described in this way:
- For each integer N, a positive integer A is H-number with N only if: LCM(N, A) = N * A
- LCM is the Lowest Common Multiple between two numbers.
- Example 1: N = 20, H-numbers = {1, 3, 7, 9, 11, 13, 17, 19}
- Example 2: N = 10, H-numbers = {1, 3, 7, 9}
Ualter loves classical music mainly Pachelbel's compositions. In order to achieve his old dream, he's willing to make a version of Canon in D using only H-numbers to create notes. To solve that problem, he needs, for each number N, the number of H-numbers of N that are between 1 and M, inclusive.
Task
You're given an integer Q - the number of queries. Each query consists of two integer N and M. Your task is to find the number of H-numbers of N between 1 and M.
Input
In the first line there's an integer Q (1 <= Q <= 10^5) representing the number of queries. In the next Q lines there are two numbers N, M (1 <= N, M <= 10^5, M < N).
Output
You have to print for each query an integer xi representing the number of H-numbers of N less or equal to M.
Sample
Input: 3 20 15 7 3 10 8 Output: 6 3 3
Added by: | Mateus Dantas [ UFCG ] |
Date: | 2012-10-03 |
Time limit: | 0.400s-1s |
Source limit: | 50000B |
Memory limit: | 1536MB |
Cluster: | Cube (Intel G860) |
Languages: | All except: ASM64 |
Resource: | Mateus Dantas |
hide comments
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2015-12-22 15:51:26 Bhuvnesh Jain
Please suggest some hints to decrease the time required by solution |
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2015-12-22 15:09:23 Bhuvnesh Jain
AC in one go... |
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2015-08-01 21:06:38 :.Mohib.:
Awesome Problem....Really Worth it...!! :) |
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2014-03-01 04:26:12 Altamir Gomes Bispo Junior [UFSCar]
@darryl: the problem setter didn't actually determine any specific presentation order for M or/and N. |
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2013-09-14 11:03:34 nitish rao
i'm getting WA :( .. Please look into it. id:10042643 Any corner test cases please?? |
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2013-09-03 04:45:37 darryl
@problem setter, please check Submission id:9657951. Keep getting WA Edit: Nevermind, got AC. Are there several testcases where M>=N? Just wondering. Last edit: 2013-07-17 03:16:14 |
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2013-09-03 04:45:37 !!.Nginx.!!
getting WA... any tricky test case please tel.. |
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2013-09-03 04:45:37 (Tjandra Satria Gunawan)(曾毅昆)
@Aditya Pande: That's magic ;-) nearly impossible... just find the weakness in test case/constraints :-P |
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2013-09-03 04:45:37 Aditya Pande
how can i do better than 0.12s without precomputation... Last edit: 2013-01-02 07:47:13 |
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2013-09-03 04:45:37 Aditya Pande
accepted in 1st attempt... :) Last edit: 2013-01-02 07:39:05 |