XCTF Guess-the-Number

一.发现是jar文件，一定想到反汇编gdui这个工具，而且运行不起来，可能是我电脑问题，我就直接反编译出来了。

也发现了flag，和对应的算法，直接拉出来，在本地运行，后得到flag
二.java代码

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