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五年前AC的题目,5年后看这道题 S不出到 10^18 太不过瘾了。。。

Posted by JiaJunpeng at 2015-09-27 15:58:44 on Problem 3559
也很难保证 S出到  10^18 是一道难题,也可能很简单。。。  谁让我会放枪的,哈哈。。。

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