作者:无语噶流浪 | 来源:互联网 | 2023-09-17 01:58
欧拉phi函数的改进版.....
Help Tomisu
Time Limit: 7000MS |
Memory Limit: Unknown |
64bit IO Format: %lld & %llu |
Submit Status
Description
Problem D
Help Mr. Tomisu
Input: Standard Input
Output: Standard Output
After wasting a significant time of his life in problem-setting, Mr. Tomisu is now searching for glory: A glory that will make him famous like Goldbach and rich like Bill Gates :). And he has chosen the field of Number Theory as his prime interest. His
creator did not make him very bright and so he needs your help to solve an elementary problem, using which he will begin his pursuit for glory!
Tomisu has come to know that finding out numbers having large prime factors are very important in cryptography. Given two integers N and M, he aims to count the number of integers x between 2 and N! (factorial N), having
the property that all prime factors of x are greater than M.
Input
The input file contains at most 500 lines of inputs. Each line contains two integers N (1
Output
For each line of input produce one line of output. This line contains the value T % 100000007 (Modulo 100000007 value of T). Here T is the total number of numbers between 1 and N! (factorial N) which have prime factors greater than M.
Sample Input Output for Sample Input
100 10
100 20
10000 9000
0 0
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43274465
70342844
39714141
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Problemsetter: Shahriar Manzoor
Special Thanks: Per Austrin
Source
Root :: AOAPC II: Beginning Algorithm Contests (Second Edition) (Rujia Liu) :: Chapter 10. Maths :: Examples
Root :: Prominent Problemsetters :: Shahriar Manzoor
Root :: AOAPC I: Beginning Algorithm Contests -- Training Guide (Rujia Liu) :: Chapter 2. Mathematics :: Number Theory :: Exercises:
Intermediate
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/* ***********************************************
Author :CKboss
Created Time :2015年02月02日 星期一 16时13分33秒
File Name :UVA11440.cpp
************************************************ */
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