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终于用分类讨论的方法把这道题艰难地AC了这种方法的特点是改了这儿错了那儿，N费劲，最后把精度从1e-5调到1e-8才AC，搓死了。。。不过这种方法的好处是锻炼思维的严谨性。。 Followed by:
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