http://acm.hdu.edu.cn/showproblem.php?pid=2161 Problem Description Write a program to read in a list of integers and determine whether or not each number is prime. A number, n, is prime if its only divisors are 1 and n. For this problem, the numbers…

Problem Description Write a program to read in a list of integers and determine whether or not each number is prime. A number, n, is prime if its only divisors are 1 and n. For this problem, the numbers 1 and 2 are not considered primes. Input Each i…

题目大意:输入一个n,判断您是否是素数.. 解题思路:简单数论 代码如下: /* * 2161_1.cpp * * Created on: 2013年8月31日 * Author: Administrator */ #include <iostream> using namespace std; bool isPrime(int n){ if(n == 1 || n == 2){ return false; }else{ int i ; for(i = 2 ; i < n ; ++i){…

题意:输入一个数判断是不是素数,并规定2不是素数. 析:一看就很简单吧,用素数筛选法,注意的是结束条件是n<0,一开始被坑了... 不说了,直接上代码: #include <iostream> #include <cstdio> #include <cstring> #include <cmath> using namespace std; typedef long long LL; const int maxn = 16000 + 10; int p…

题目连接 http://acm.hdu.edu.cn/showproblem.php?pid=5104 Primes Problem Description Given a number n, please count how many tuple$(p_1, p_2, p_3)$ satisfied that $p_1 \leq p_2  \leq p_3, $ $p_1,p_2,p_3$ are primes and $p_1 + p_2 + p_3 = n$. Input Multiple…

//宁用大量的二维不用量小的三维 #include <iostream> #include<cstdio> #include<cstring> using namespace std; ],num[]; int Cout; void initPrime() { ;i<=;i++) num[i]=; ;i<=;i++) { if(num[i]) { *i;j<=;j+=i) { num[j]=; } } } } int main() { initPrim…

        ID Origin Title   111 / 423 Problem A LightOJ 1370 Bi-shoe and Phi-shoe   21 / 74 Problem B LightOJ 1356 Prime Independence   61 / 332 Problem C LightOJ 1341 Aladdin and the Flying Carpet   54 / 82 Problem D LightOJ 1336 Sigma Function   66 /…

KUANGBIN带你飞 全专题整理 https://www.cnblogs.com/slzk/articles/7402292.html 专题一 简单搜索 POJ 1321 棋盘问题    //2019.3.18 POJ 2251 Dungeon Master POJ 3278 Catch That Cow  //4.8 POJ 3279 Fliptile POJ 1426 Find The Multiple  //4.8 POJ 3126 Prime Path POJ 3087 Shuffle…

                                                10200 - Prime Time 此题极坑(本菜太弱),鉴定完毕,9遍过. 题意:很简单的求一个区间[a,b]内满足i*i+i+41(i>=a&&i<=b,0<=a<=b<=10000.)是素数的数有多个,求出百分比. 思路:直接裸判就行了(竟然不超时),但结果要加上1e-8(are you kidding me?). 下面来说说我怎么跪了,开始也是直接裸判,我…

[kuangbin带你飞]专题1-23 专题一 简单搜索 POJ 1321 棋盘问题POJ 2251 Dungeon MasterPOJ 3278 Catch That CowPOJ 3279 FliptilePOJ 1426 Find The MultiplePOJ 3126 Prime PathPOJ 3087 Shuffle'm UpPOJ 3414 PotsFZU 2150 Fire GameUVA 11624 Fire!POJ 3984 迷宫问题HDU 1241 Oil Deposit…