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QOJ

Type: Editorial

Status: Open

Posted by: jiangly

Posted at: 2026-02-19 13:09:39

Last updated: 2026-02-19 13:09:59

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题解

矩形的高和宽分别只有 $O(\sqrt n)$ 种，枚举之后求和即可。时间复杂度 $O(n)$。

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