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时间复杂度

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杨烨
2021-12-13 13:20:38 +08:00
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数据结构/时间复杂度/常用数列前n项和.md Normal file
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# 求解中常用数列的前n项和
### 1. n<sup>2</sup>
$$
n(n+1)(2n+1)/6
$$