Tony102's Blog - CF616E Sum of Remainders 的评论
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link: https://tony102.com/index.php/archives/62/
description: linkSol现在让你求的是$$\sum_{i = 1}^{m} n \ mod \ i$$模运算这种东西就是带余除法，然后你发现余数你也很不好算。就考虑把模运算改成带余除法的形式我们知道: $...