传送门 分析 我们知道如果对于模数$P$有$gcd(x,P) = 1$则$x$一定有且仅有一个逆元,可以表示为 $x \equiv \frac{y}{1} (mod P)$ 即为$xy \equiv 1(mod P)$ 所以我们只需要找出与$P$互质的数的个数然后除以二再加上$i*i \equiv 1(mod P)$这种情况的个数即可 除以二的原因是相同的$x,y$会被统计两次 代码 #include<iostream> #include<cstdio> #include<c…

第一种报错: 严重: Exception starting filter struts2Unable to load configuration. - action - file:/E:/apache-tomcat-8.0.37/webapps/20161102-struts2-3/WEB-INF/classes/struts.xml:11:73 at org.apache.struts2.dispatcher.Dispatcher.init(Dispatcher.java:504) at or…

[源码下载] 重新想象 Windows 8.1 Store Apps (73) - 新增控件: DatePicker, TimePicker 作者:webabcd 介绍重新想象 Windows 8.1 Store Apps 之新增控件 DatePicker - 日期选择控件 TimePicker - 时间选择控件 示例1.演示 DatePicker 的应用DatePickerDemo.xaml <Page x:Class="Windows81.Controls.DatePickerDemo…

转载: 73条日常Linux shell命令汇总,总有一条你需要! 1.检查远程端口是否对bash开放: echo >/dev/tcp/8.8.8.8/53 && echo "open" 2.让进程转入后台: Ctrl + z 3.将进程转到前台: fg 4.产生随机的十六进制数,其中n是字符数: openssl rand -hex n 5.在当前shell里执行一个文件里的命令: source /home/user/file.name 6.截取前5个字符: ${…

INFO ipc.Client: Retrying connect to server: hadoop/192.168.73.100:9000. Already tried 0 time(s); retry policy is RetryUpToMaximumCountWithFixedSleep(maxRetries=10, sleepTime=1 SECONDS) INFO ipc.Client: Retrying connect to server: hadoop/192.168.73.1…

一.前言 二.概述 三.安装MySQL 5.1.73 四.升级为MySQL 5.5.35 五.总结 注,测试环境 CentOS 6.4 x86_64,MySQL 版本(5.1.73.5.5.35)目前最新版.下载地址:http://dev.mysql.com/downloads/mysql/5.1.html#downloads. 一.前言 前几篇博客中我们讲解了MySQL5.1与MySQL5.5之间的性能差异,MySQL5.5的性能有明显的提升,特别是对多核CPU的支持与TPS性能的提升.在这篇…

前几天给一套LINUX下的RAC数据库打补丁升级,有一台机器更新失败了,相关的异常内容如下: Restoring "/u01/app/oracle/11.2.0/db_1" to the state prior to running NApply... Checking if OPatch needs to invoke 'make' to restore some binaries... Make failed to invoke "/usr/bin/make -f ins…

题目链接:https://projecteuler.net/problem=73 n/d的真分数 ,当d<=12000时 在 1/3 and 1/2 之间的有多少个 public class P73{ void run(){ FareySequences(); } void FareySequences(){ int limit = 12000; int a = 1; int b = 3; int c = 4000; int d = 11999; int count=0; while(!(c==…

Consider the fraction, n/d, where n and d are positive integers. If nd and HCF(n,d)=1, it is called a reduced proper fraction. If we list the set of reduced proper fractions for d  8 in ascending order of size, we get: 1/8, 1/7, 1/6, 1/5, 1/4, 2/7, 1…

Rikka with Phi  Accepts: 5  Submissions: 66  Time Limit: 16000/8000 MS (Java/Others)  Memory Limit: 131072/131072 K (Java/Others) Problem Description Rikka and Yuta are interested in Phi function (which is known as Euler's totient function). Yuta giv…