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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/12a7a697729748dea07737ca0e5e5ff4.gif)!(https://oscimg.oschina.net/oscnet/a823bf6406534481ae036d165051c662.jpg)Python是一种通用的编程和脚本语言。

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!头图.png(https://ucc.alicdn.com/pic/developerecology/5824380392614cdc8c0ea59a9a06a10d.png)作者| YourBatman 在线教育领域资深架构师，SpringFramework开源贡献者冷冷 云集架构师、开源项目pig 负责人、SpringClo

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\