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From Trường THPT chuyên Đại học Sư phạm Hà Nội
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Sqrt decomp makes things 5x faster or slower, there's no in between
Complexity of my mult function for 2060F:
$$\sum_{i=1}^{n}{\sum_{j \vdots i, j \leq n}{\frac{n}{j}}} \sim n\log^2(n)$$
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