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zxl 说so easy这么简单的题目，主要看人是不是有条件反射能力。有数学功底的都知道这种题是一定有两种极端的解，推一下就知道了。 做ACM要有一种能力，叫做预言，要先推结论，再给证明，这是科学家的思维方式。 Followed by: Post your reply here: |
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