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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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2013-09-03 04:45:37 Mateus Dantas [ UFCG ]
Thank you guys. So far it's the best problem that I've ever made. |
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2013-09-03 04:45:37 (Tjandra Satria Gunawan)(曾毅昆)
@Snehasish Roy ;): wow, that's great :-D |
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2013-09-03 04:45:37 Snehasish Roy ;)
@Tjandra : Now I think we are even. I also did it in 2.6 MB memory and 0.04 sec in c++ !!! :) Last edit: 2012-12-13 16:07:25 |
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2013-09-03 04:45:37 (Tjandra Satria Gunawan)(曾毅昆)
@Snehasish Roy ;): Congratulations, We're tie in running time, but I still win in memory, I compute the answer without large precomputation that wasted memory... |
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2013-09-03 04:45:37 Snehasish Roy ;)
Loved doing this :) :) +1 for the problem setter. |
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2013-09-03 04:45:37 Mateus Dantas [ UFCG ]
Thank you! :) |
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2013-09-03 04:45:37 Pranay
nice :) |