题目链接:http://lightoj.com/volume_showproblem.php?problem=1197 题意:给你两个数 a b,求区间 [a, b]内素数的个数, a and b (1 ≤ a ≤ b < 231, b - a ≤ 100000). 由于a和b较大,我们可以筛选所有[2, √b)内的素数,然后同时去筛选掉在区间[a, b)的数,用IsPrime[i-a] = 1表示i是素数: ///LightOj1197求区间素数的个数; #include<stdio.h&g
题目大意: 给出T个实例,T<=200,给出[a,b]区间,问这个区间里面有多少个素数?(1 ≤ a ≤ b < 231, b - a ≤ 100000) 解题思路: 由于a,b的取值范围比较大,无法把这个区间内的所以素数全部筛选出来,但是b-a这个区间比较小,所以可以用区间素数筛选的办法解决这个题目. 代码: #include<cstdio> #include<cstring> #include<iostream> #include<algorith
题目链接:https://vjudge.net/problem/LightOJ-1197 1197 - Help Hanzo PDF (English) Statistics Forum Time Limit: 2 second(s) Memory Limit: 32 MB Amakusa, the evil spiritual leader has captured the beautiful princess Nakururu. The reason behind this is he
题目链接 Problem Description In mathematics, the function d(n) denotes the number of divisors of positive integer n. For example, d(12)=6 because 1,2,3,4,6,12 are all 12's divisors. In this problem, given l,r and k, your task is to calculate the followin
The branch of mathematics called number theory is about properties of numbers. One of the areas that has captured the interest of number theoreticians for thousands of years is the question of primality. A prime number is a number that is has no prop
Description The branch of mathematics called number theory is about properties of numbers. One of the areas that has captured the interest of number theoreticians for thousands of years is the question of primality. A prime number is a number that is
The branch of mathematics called number theory is about properties of numbers. One of the areas that has captured the interest of number theoreticians for thousands of years is the question of primality. A prime number is a number that is has no prop
E - Help Hanzo Time Limit:2000MS Memory Limit:32768KB 64bit IO Format:%lld & %llu Submit Status Practice LightOJ 1197 Description Amakusa, the evil spiritual leader has captured the beautiful princess Nakururu. The reason behind this is he ha