sky同学在努力地刷题..,在这题卡住了,于是一起研究了一下... 这题本身挺简单的,(1) = 1, f(2) = 1, f(n) = (A * f(n - 1) + B * f(n - 2)) mod 7. 递推公式本身是mod7的...所以f(n-1)和f(n-2)最多只有49种状态,根据鸽巢原理在50以内必定循环. 只要推导出周期和循环的起始位置就行了.一开始只算了周期,没考虑从哪里开始循环,但竟然神奇地AC了...后来想了想觉得不对,应该加入循环的起始位置. 经过手动验证 7 7 49…

题目链接:http://acm.hdu.edu.cn/showproblem.php?pid=1005 Number Sequence Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others) Total Submission(s): 85249    Accepted Submission(s): 20209 Problem Description A number sequence…

今天总算开学了,当了班长就是麻烦,明明自己没买书却要带着一波人去领书,那能怎么办呢,只能说我善人心肠哈哈哈,不过我脑子里突然浮起一个念头,大二还要不要继续当这个班委呢,既然已经体验过就可以适当放下了吧,用心在自己的研究上.晚上级会开完也就八点多了,开始打打题,今天在HDU杭电的ACM集训题看到一个奇葩的题,前来献上. 今日推荐: <全球风暴> 一部宇宙航空和地球气候片的良心佳作,后期特效建模都是特别杠杠的大片,不会让你失望的哟,我已经三刷了哈哈哈.这部片在爱奇艺有上线,有兴趣的朋友可以看看鸭.…

杭电oj并没有反爬 所以直接爬就好了 直接贴源码(参数可改,循环次数可改,存储路径可改) import requests from bs4 import BeautifulSoup import time def write_in_file(number,string):#output function with open ('D:\\python\\python_code\\hdoj\\'+str(number)+".txt","a+",encoding='utf…

暑假集训虽然很快乐,偶尔也会比较枯燥,,这个时候就需要自娱自乐... 然后看hdu的排行榜发现,除了一些是虚拟测评机的账号以外,有几个都是AC自动机器人 然后发现有一位作者是用网页填表然后按钮模拟,,,默默噗噗的笑了... 先来晒一下排行榜 要模拟网页,,当然POST大法好啊,直接模拟发送POST数据不就好了咩,,搞填表啥的多麻烦,完全可以写一个程序后台自动跑. 然后他说了一句AC率能达到50%以上的爬虫也是挺吊的,,于是激起了我试一试的决心(我是不是很wuliao)... 先解释一下POST大…

HDU 1005 Number Sequence(数列) Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 65536/32768 K (Java/Others) [Description] [题目描述] A number sequence is defined as follows: f(1) = 1, f(2) = 1, f(n) = (A * f(n - 1) + B * f(n - 2)) mod 7. Given A, B, an…

异或^符号,在平时的学习时可能遇到的不多,不过有时使用得当可以发挥意想不到的结果. 值得注意的是,异或运算是建立在二进制基础上的,所有运算过程都是按位异或(即相同为0,不同为1,也称模二加),得到最终结果. 特点:任何数和0异或都等于它本身;两个相同的数异或后的结果是0: 举例如下: int a = 4 =100(二进制) int b = 3 =011(二进制) int c = a^b = 111 = 7: 下面就^常用应用做个介绍: 1. 在一排数中找到独一无二的一个数 本例启发来自于杭电oj…

暑假集训主要是在杭电oj上面刷题,白天与算法作斗争,晚上望干点自己喜欢的事情! 首先,确定要爬取哪些数据: 如上图所示,题目ID,名称,accepted,submissions,都很有用. 查看源代码知: 所有的数据都在一个script标签里面. 思路:用beautifulsoup找到这个标签,然后用正则表达式提取. 话不多说,上数据爬取的代码: import requests from bs4 import BeautifulSoup import time import random imp…

import java.util.Arrays; import java.util.Scanner; //杭电oj 4004 //解题思路:利用二分法查找,即先选取跳跃距离的区间,从最大到最小, //然后去中值,并依次到judgeHigh函数判断是否满足条件,然后逐步逼近最终答案 public class Main { public static void main(String[] args) { Scanner in=new Scanner(System.in); while (in.has…

HDU 1005 Number Sequence(数论) Problem Description: A number sequence is defined as follows:f(1) = 1, f(2) = 1, f(n) = (A * f(n - 1) + B * f(n - 2)) mod 7. Given A, B, and n, you are to calculate the value of f(n).   Input The input consists of multipl…

question:A+ B again 思路:额,没啥思路/捂脸,用java的long包里的方法,很简单,只是有几次WA,有几点要注意一下 注意:如果数字有加号要删除掉,这里用到了正则表达式“\\+”来匹配加号(我在自己的电脑里不用删除加号也可以通过,杭电oj上就过不了,必须要加这个……) source code: package hduoj; import java.util.Scanner; public class hdoj_2057 { public static void main(S…

HDU - 1005 Number Sequence Problem Description A number sequence is defined as follows:f(1) = 1, f(2) = 1, f(n) = (A * f(n - 1) + B * f(n - 2)) mod 7.Given A, B, and n, you are to calculate the value of f(n). Input The input consists of multiple test…

主题 Calculate a + b 杭电OJ-1000 Input Each line will contain two integers A and B. Process to end of file. Output For each case, output A + B in one line. Mine #include <stdio.h> int main() { int a,b; while(~scanf("%d %d",&a,&b)) //多次…

Quoit Design Problem Description Have you ever played quoit in a playground? Quoit is a game in which flat rings are pitched at some toys, with all the toys encircled awarded. In the field of Cyberground, the position of each toy is fixed, and the ri…

Number Sequence Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others)Total Submission(s): 175657    Accepted Submission(s): 43409 Problem Description A number sequence is defined as follows: f(1) = 1, f(2) = 1, f(n) = (A…

Number Sequence Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others)Total Submission(s): 154923    Accepted Submission(s): 37854 Problem Description A number sequence is defined as follows: f(1) = 1, f(2) = 1, f(n) = (A…

畅通工程 Problem Description 某省调查城镇交通状况,得到现有城镇道路统计表,表中列出了每条道路直接连通的城镇.省政府"畅通工程"的目标是使全省任何两个城镇间都可以实现交通(但不一定有直接的道路相连,只要互相间接通过道路可达即可).问最少还需要建设多少条道路?    Input 测试输入包含若干测试用例.每个测试用例的第1行给出两个正整数,分别是城镇数目N ( < 1000 )和道路数目M:随后的M行对应M条道路,每行给出一对正整数,分别是该条道路直接连通的两个…

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…

Problem Description A number sequence is defined as follows:f(1) = 1, f(2) = 1, f(n) = (A * f(n - 1) + B * f(n - 2)) mod 7.Given A, B, and n, you are to calculate the value of f(n).   Input The input consists of multiple test cases. Each test case co…

杭电acm 提交代码需要注意的问题 1. 用 Java 的时候类名请用 Main 2. Java 提交出现 PE 的可能原因有 1) 最基本的错误是空格问题,比如注意每行的末尾是否输出空格 2) 用 Java 提交的时候需要注意换行是用的什么方法输出的,如果用 System.out.printf() 这个格式化输出,请使用 %n 或者 \r\n 作为转义符,而不要用 \n,也可以用 System.out.println() 输出换行   3. 对包含比较精确的数字计算最好使用 C/C++ 语言,…

题目链接 Problem Description A number sequence is defined as follows: f(1) = 1, f(2) = 1, f(n) = (A * f(n - 1) + B * f(n - 2)) mod 7. Given A, B, and n, you are to calculate the value of f(n). Input The input consists of multiple test cases. Each test ca…

呕,大一下学期的第一周结束啦,一周过的挺快也挺多出乎意料的事情的~ 随之而来各种各样的任务也来了,嘛毕竟是大学嘛,有点上进心的人多多少少都会接到不少任务的,忙也正常啦~端正心态 开心面对就好啦~ 今天突然回顾了一下<从你的全世界路过>这本书和电影,莫名的感悟涌上心头,收集到了一些走入人心的一些语句: 1.在季节的车上,如果你要提前下车,请别推醒装睡的我,这样我可以沉睡到终点,假装不知道你已经离开. 2.世事如书,我偏爱你这一句,愿做个逗号,待在你脚边.但你有自己的朗读者,而我只是个摆渡人. 3…

今天开始和一个认识的学弟刷题. 学弟是个大牛,我还是个菜鸟.嘿嘿. 杭电第一题我就wrong了好几次. #include <iostream> using namespace std; int main() { ,B = ; while(cin >> A >> B) { cout<< A + B << endl; } ; } #include <iostream> using namespace std; int main() { ,…

Number Sequence Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others)Total Submission(s): 187893    Accepted Submission(s): 46820 Problem Description A number sequence is defined as follows: f(1) = 1, f(2) = 1, f(n) = (A…

Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others)Total Submission(s): 177761    Accepted Submission(s): 44124 Problem Description A number sequence is defined as follows: f(1) = 1, f(2) = 1, f(n) = (A * f(n - 1) + B…

A number sequence is defined as follows: f(1) = 1, f(2) = 1, f(n) = (A * f(n - 1) + B * f(n - 2)) mod 7. Given A, B, and n, you are to calculate the value of f(n). InputThe input consists of multiple test cases. Each test case contains 3 integers A,…

Problem Description A number sequence is defined as follows: f(1) = 1, f(2) = 1, f(n) = (A * f(n - 1) + B * f(n - 2)) mod 7. Given A, B, and n, you are to calculate the value of f(n).   Input The input consists of multiple test cases. Each test case…

A number sequence is defined as follows:  f(1) = 1, f(2) = 1, f(n) = (A * f(n - 1) + B * f(n - 2)) mod 7.  Given A, B, and n, you are to calculate the value of f(n). Input The input consists of multiple test cases. Each test case contains 3 integers…

1.先描述一下问题: 小yb有一个排列,但他不小心弄丢了其中的两个数字.现在他告诉你他现在手上还有哪些数字,需要你告诉他他丢了哪两个数字. 输入描述 有多组数据,第一行为数据组数T(T≤10). 对于每组数据,第一行为一个正整数n,表示yb现在手上有的数字个数. 在接下来一行有n个整数,保证所有数字互不相同且合法. 1≤n≤1,000 输出描述 对于每组数据,输出两个数字,为排列缺少的两个数字,小的在前. 2.解题思路 该问题可以用一个数组存储输入排列,然后用一个偏移指针处理每次输入数据移动的情…

The 3n + 1 problem Problem Description Problems in Computer Science are often classified as belonging to a certain class of problems (e.g., NP, Unsolvable, Recursive). In this problem you will be analyzing a property of an algorithm whose classificat…