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https://blog.csdn.net/weixin_45332776/article/details/116613485
全局变量和静态本地变量
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https://blog.csdn.net/qq_43194080/article/details/125686287
关于二维数组
https://blog.csdn.net/weixin_45332776/article/details/116613485
关于static
https://blog.csdn.net/qq_43194080/article/details/125686287