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发一下要注意的一些……基本上都是精度问题…… 1. 直接用%lf输出是不行的，因为默认输出到小数点后6位，而题目要求10位 2. 不要输出-0.00000之类的东西，我怀疑spj判负数的方法就是字符串读入然后检查第一个字符，所以这个就挂了 Followed by:
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