Meissel-Lehmer 算法 #971
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为什么写 |
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还有，Meisell Lehmer 是两个人 |
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在记号规定的第一项：向下取整不应该是[x]吧（中括号x中括号） |
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但似乎取整和向下取整的结果一致 |
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虽然这不涉及负数，但最好还是改了比较好（ |
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这是原论文的记号，然后就是在很多情况下中括号就是下取整。 |
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取整在数学中基本和向下取整是一个意思，跟 C++ 中的强制转类型不一样。 |
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记号规定最后一行有误，应该是 |
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https://oi-wiki.org/math/meissel-lehmer/
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