!(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

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问题描述：1、在命令行中进行插入，没有问题。但是显示存在部分乱码 !(https://oscimg.oschina.net/oscnet/736313f084b29ade316c80ba48aeeda42e6.png)!(https://img2018.cnblogs.com/blog/1183162/201903/1183162

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

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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\

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