codeforces 385C C. Bear and Prime Numbers(线性筛素数),题目链接:codeforces385C题目大意:给出n个数,数据范围10710^7,给出m次查询,每来方便求取区间和。AC代码:
Write a C program to count prime numbers in an array by applying a prime-check function to each element. Write a C program that determines if a number is prime using a recursive function to check factors. C Programming Code Editor:
关於素数的一点 (about the prime numbers) 只看楼主 收藏 回复 哀伤之月 大能力者 8 素数,亦称质数,指在一个大於1的自然数中,除了1和此整数自身外,无法被其他自然数整除的数。换句话说,只有两个正因数(1和自己)的自然数即为素数。素数这个概念 , 这个估计大家都不陌生 , 因为小学就已经接触了.此贴...
385C - Bear and Prime Numbers 思路:记录数组中1-1e7中每个数出现的次数,然后用素数筛看哪些能被素数整除,并加到记录该素数的数组中,然后1-1e7求一遍前缀和。 代码: #include<bits/stdc++.h>usingnamespacestd;#definell long long#definepb push_back#definemem(a,b) memset((a),(b),sizeof(a))co...
在筛素数时计算每个数可以对应多少个题目中给定的数ai, 满足这个数是ai的因子, 然后预处理前缀和,O(1)完成查询 #include <cstdio> #include <cstring> #include <iostream> #include <algorithm> usingnamespacestd; constintmaxn=1e6; constintmaxm=1e7+5; ...
Secondary School MathematicsA Computational Perspectivedoi:10.1007/0-387-28979-8Richard CrandallCenter for Advanced Computation, 3754 SE Knight Street, Portland, OR, 97202, USACarl PomeranceDepartment of Mathematics, Dartmouth College, Hanover, NH, 03755-3551, USASpringer New York...
I played with using Step 2 to pass half as many numbers through the IsPrime function but that didn’t seem to make a whole lot of difference in the time. I was surprised by that and want to look into that some more. It may be that the first compare in the IsPrime function ...
CodeForces - 385C Bear and Prime Numbers——素数筛法 在筛素数时计算每个数可以对应多少个题目中给定的数ai, 满足这个数是ai的因子, 然后预处理前缀和,O(1)完成查询 #include#include#include#includeusing namespace std;const int maxn = 1e6;const int maxm = 1e7 + 5;int n, m, a[maxn], l...
题目中给出的问题是:“The prime numbers less than 10 are 2, 3, 5, and 7.” 需要根据选项判断正确答案。题目实际考察小于10的质数的数量。小于10的质数包括2、3、5、7,共4个,因此正确选项是C)4,对应数量正确。其他选项中A、B、D均为具体质数的数值(不涉及数量),且与题目要求的数量无关,直...
#include <string.h> #include <stdlib.h> #include <math.h> #include <string> #include <iostream> #include <algorithm> using namespace std; #include <queue> #include <stack> #include <vector> #include <deque> #include <set> #include <map> ...