本来是不打算贴这道水题的,自己却WA了三次.. 要考虑1的情况,1的质因子为1 思路:先打表 ,然后根据最大质因子更新结果 代码: #include<iostream> #include<cstdlib> #include<cstdio> #include<cstring> using namespace std; #define MAX 20000 int p[MAX]; int main() { memset(p,,sizeof(p)); p[]=; ;…

Problem Description To improve the organization of his farm, Farmer John labels each of his N (1 <= N <= 5,000) cows with a distinct serial number in the range 1..20,000. Unfortunately, he is unaware that the cows interpret some serial numbers as be…

Equations 题目链接:http://acm.hdu.edu.cn/showproblem.php?pid=1840 ——每天在线,欢迎留言谈论. 题目大意: 给你一个一元二次方程组,a(X^2) + b(X) + c = 0 .求X解的个数. 思路: 分别讨论二次方程与一次方程的情况,再特殊处理下 a = b = c = 0 的情况. 感想: 是时候该水水题了. Java AC代码: import java.math.*; import java.util.Scanner; public…

#include<iostream> #include<stdio.h> #include<string.h> #include<cmath> using namespace std; const int maxn=20017; int s[maxn]; int main() { int n,m; int i,j; memset(s,0,sizeof(s)); /*s[1]=1;//埃筛素数 for(i=2; i<maxn; i++) { if(s[i…

这道题的题目描述灰常简单,第一眼看以为是一道十分水的题目: 但是!!!(我仔细一看也没有发现这背后隐藏着可怕的真相~) 下面给出题目描述: 给出一个整数x,你可以对x进行两种操作.1.将x变成4x+32.将x变成8x+7问,最少通过多少次操作,使得x是1000000007的倍数? 没错,就是这么坑!当我仔细读完题目后本还抱有几分希望(也许可以水过) 但是!!!没错我又一次用了"但是"这个词: 当我看到数据范围时我几乎就放弃了,只能用暴力来骗分了,仅仅只水到了50分(也知足了) [输入格…

Big Number Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others)Total Submission(s): 21106    Accepted Submission(s): 9498 Problem Description In many applications very large integers numbers are required. Some of these…

Friendship of Frog Time Limit: 20 Sec Memory Limit: 256 MB 题目连接 http://acm.hdu.edu.cn/showproblem.php?pid=5578 Description N frogs from different countries are standing in a line. Each country is represented by a lowercase letter. The distance betwee…

ZYB's Biology Time Limit: 20 Sec Memory Limit: 256 MB 题目连接 http://acm.hdu.edu.cn/showproblem.php?pid=5590 Description ZYB(ZJ−267)在NOIP拿到600分之后开始虐生物题,他现在扔给你一道简单的生物题:给出一个DNA序列和一个RNA序列,问它们是否配对. DNA序列是仅由A,C,G,T组成的字符串,RNA序列是仅由A,C,G,U组成的字符串. DNA和RNA匹配当且仅当每…

L - House Building Time Limit: 20 Sec Memory Limit: 256 MB 题目连接 http://acm.hdu.edu.cn/showproblem.php?pid=5538 Description Have you ever played the video game Minecraft? This game has been one of the world's most popular game in recent years. The wor…

Number Sequence Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others)Total Submission(s): 89984    Accepted Submission(s): 21437 Problem Description A number sequence is defined as follows: f(1) = 1, f(2) = 1, f(n) = (A…