C. Sonya and Robots time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output Since Sonya is interested in robotics too, she decided to construct robots that will read and recognize numbers. Sonya ha…

Sonya and Robots time limit per test 1 second memory limit per test 256 megabytes input: standard input output: standard output Since Sonya is interested in robotics too, she decided to construct robots that will read and recognize numbers. Sonya has…

Since Sonya is interested in robotics too, she decided to construct robots that will read and recognize numbers. Sonya has drawn nn numbers in a row, aiai is located in the ii-th position. She also has put a robot at each end of the row (to the left…

http://codeforces.com/contest/1004/problem/C 题意: 在一行上有n个数字,现在在最左边和最右边各放置一个机器人,左右机器人各有一个数字p和q.现在这两个机器人从起点开始分别向右和向左移动,当它们移动到和他们自己数字相同的格子时就会停止,否则就会一直移动下去知道出界.现在要计算出有多少组不重复的(p,q)可以使得这两个机器人不相遇. 思路: 只要去考虑每个数第一次出现的位置和最后出现的位置即可.这题我用了前缀和的思想,首先从左到右扫描一遍,算出1~i这个…

1 #include<iostream> #include<cstdio> #include<algorithm> #include<cstring> #include<set> using namespace std; ]; ]; int main() { set<int>s; int n; cin>>n; ;i<=n;i++) scanf("%d",&a[i]); ;i--) { s.…

网站 robots.txt 文件编写 Intro robots.txt 是网站根目录下的一个纯文本文件,在这个文件中网站管理者可以声明该网站中不想被robots访问的部分,或者指定搜索引擎只收录指定的内容. 当一个搜索机器人(有的叫搜索蜘蛛或爬虫)访问一个站点时,它会首先检查该站点根目录下是否存在robots.txt ,如果存在,搜索机器人就会按照该文件中的内容来确定访问的范围: 如果该文件不存在,那么搜索机器人就沿着链接抓取. robots.txt 必须放置在一个站点的根目录下,而且文件名必须…

Robots.txt - 禁止爬虫 robots.txt用于禁止网络爬虫访问网站指定目录.robots.txt的格式采用面向行的语法:空行.注释行(以#打头).规则行.规则行的格式为:Field: value.常见的规则行:User-Agent.Disallow.Allow行. User-Agent行 User-Agent: robot-name User-Agent: * Disallow和Allow行 Disallow: /path Disallow: # 空字符串,起通配符效果,全禁止 A…

1如果允许所有搜索引擎访问网站的所有部分的话 我们可以建立一个空白的文本文档,命名为robots.txt放在网站的根目录下即可.robots.txt写法如下:User-agent: *Disallow:或者User-agent: *Allow: /2如果我们禁止所有搜索引擎访问网站的所有部分的话robots.txt写法如下:User-agent: *Disallow: /3如果我们需要某一个搜索引擎的抓取的话,比如百度,禁止百度索引我们的网站的话robots.txt写法如下:User-agent…

题目 Source http://codeforces.com/problemset/problem/713/C Description Sonya was unable to think of a story for this problem, so here comes the formal description. You are given the array containing n positive integers. At one turn you can pick any ele…

Robots Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/65536 K (Java/Others)Total Submission(s): 60    Accepted Submission(s): 13 Problem Description QXJ has N robots on the plane, the i-th is at (xi,yi), numbereded 1 to N. Every robot…