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这里使用的是JupyterNotebook。1.打开JupyterNotebook，然后按回车键（enter），在打开的网页中，我们找到New，打开Python3。!(https://oscimg.oschina.net/oscnet/upabedd72c287d1f5466a25dc17e19507f650.png)!

!(https://oscimg.oschina.net/oscnet/2af3de6213a842a08f7a8b1544c6ebf0.png)StringBuilder与StringBuffer区别StringBuilder可变字符串，线程不太安全，但效率高，推荐使用。StringBuffer可变字符串，线程安全，但效率

!头图.png(https://ucc.alicdn.com/pic/developerecology/d072b25dc9c248f488a85a8312431d2f.png)作者|changshuai来源|Serverless公众号FaaS的门槛Serverless形态的云服务帮助开发者承担了大量复杂的

!(https://oscimg.oschina.net/oscnet/ea87a69a082d4e9bb878d4be478becb9.jpg)!(https://oscimg.oschina.net/oscnet/666cde8b65b742d3a30c89a0a19cb78d.jpg)导语Thanos

!(https://oscimg.oschina.net/oscnet/up6d5d608cbd70099a23ff17107b5fedade1c.JPEG)在上篇关于TiFlash的文章(https://www.oschina.net/action/GoToLink?urlhttps%3A%2F%2Fpingcap.com%2Fblo

昨天有练习对数字阵列进行排序，《C阵列Array排序(https://www.oschina.net/action/GoToLink?urlhttps%3A%2F%2Fwww.cnblogs.com%2Finsus%2Fp%2F10825174.html)》https://www.cnblogs.com/insus/p/10825174.html

有人在社区问到：C调用Oracle中自定义函数的返回值时，无法正常调用。但在PL/SQL中正常调用返回。于是动手一试：1、准备函数(Oralce11g.2.0.0.4)CREATEORREPLACEFUNCTIONF_Update_Grade(v_UserIDinNumber)returnnvarchar2

题意给你$n$个元素，$m$个方程。每个方程形如$$\\begin{align}\\gcd(x\_i,y\_i)c\_i\\\\mathrm{lcm}(x\_i,y\_i)d\_i\\end{align}$$之类的形式。询问这个方程组是否有解。有$T$组数据。$1\\leT\\le10,1\