https://code.google.com/codejam/contest/6224486/dashboard#s=p2 题目中的新运算满足传递性不满足自反性,满足传递性则可以先计算后面的部分再计算前面的,明显设每节的计算结果为val,则要成功必然需要val*val^(x-1)(也就是x个val相乘)恰为-1(i*j*k==-1),因为满足传递性,所以在此条件下,只需要取前面的一部分等于i,后面一部分等于k,中间一部分就会等于j了. 注意到无论每节的结果是什么,每四节的结果一定是1,所以左边…

Problem It’s opening night at the opera, and your friend is the prima donna (the lead female singer). You will not be in the audience, but you want to make sure she receives a standing ovation – with every audience member standing up and clapping the…

Problem It’s opening night at the opera, and your friend is the prima donna (the lead female singer). You will not be in the audience, but you want to make sure she receives a standing ovation – with every audience member standing up and clapping the…

题目链接: http://codeforces.com/problemset/problem/522/D D. Closest Equals time limit per test3 secondsmemory limit per test256 megabytes 问题描述 You are given sequence a1, a2, ..., an and m queries lj, rj (1 ≤ lj ≤ rj ≤ n). For each query you need to print…

B. Photo to Remember Time Limit: 1 Sec  Memory Limit: 256 MB 题目连接 http://codeforces.com/contest/522/problem/B Description One day n friends met at a party, they hadn't seen each other for a long time and so they decided to make a group photo together…

D. Closest Equals Time Limit: 1 Sec  Memory Limit: 256 MB 题目连接 http://www.lydsy.com/JudgeOnline/problem.php?id=3224 Description You are given sequence a1, a2, ..., an and m queries lj, rj (1 ≤ lj ≤ rj ≤ n). For each query you need to print the minimu…

传送门 A. Reposts time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output One day Polycarp published a funny picture in a social network making a poll about the color of his handle. Many of his friend…

Sightseeing Time Limit: 2000MS   Memory Limit: 65536K Total Submissions: 8707   Accepted: 3056 Description Tour operator Your Personal Holiday organises guided bus trips across the Benelux. Every day the bus moves from one city S to another city F. O…

1. 安装VS2010 1.1 安装步骤 1. 注意安装的时候,选择自定义安装,将不需要的VB.net去掉. 2. 看一下C++下的x64选项是否选择了,如果没选,将其选上. 3. 一定要将 Microsoft SQL Server 2008 Express 勾选掉.否则将来安装 SQL Server 2008 R2时,会提示 SQL Server 2008已安装,安装会出问题. 4. 安装完成后,在最后一个页面点击“Install Documentation”,以安装 Help Library…

之前在栈溢出漏洞的利用和缓解中介绍了栈溢出漏洞和一些常见的漏洞缓解 技术的原理和绕过方法, 不过当时主要针对32位程序(ELF32). 秉承着能用就不改的态度, IPv4还依然是互联网的主导, 更何况应用程序. 所以理解32位环境也是有必要的. 不过, 现在毕竟已经是2018年了, 64位程序也逐渐成为主流, 尤其是在Linux环境中. 因此本篇就来说说64位下的利用与32位下的利用和缓解绕过方法有何异同. 基础知识 寄存器 我们所说的32位和64位, 其实就是寄存器的大小. 对于32位寄存器大…