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「QQ红包」

2017-12-08 20:22:54

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my blog: http://redbag.pw/ wahace大佬的blog:http://www.wahacer.com/ mzh大佬的blog:http://xqmmcqs.com/ $$ \begin{eqnarray} ans=\sum \limits \_{i=1} ^{k} \bigg(\sum \_{d=1}^{i} \mu \big(d\big)\bigg\lfloor \frac{i}{d} \bigg\rfloor ^{n} \bigg)\oplus i\\ \end{eqnarray} $$