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…
Help Hanzo 题意:求a~b间素数个数(1 ≤ a ≤ b < 231, b - a ≤ 100000). (全题在文末) 题解: a~b枚举必定TLE,普通打表MLE,真是头疼.. b - a ≤ 100000 是关键. 类似素数筛的方法: 1.初始化vis[]=0 ; 2.素数的倍数vis[]=1; 3. b较小时,素数筛解决 b很大时,素数筛的vis[]会MLE,此时用vis2[i-a]保存vis[i]就不会MLE 了.. #include<iostream>…
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…
