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58问答库 > 设计一个算法1方+2方+····+99方+100方的值

设计一个算法1方+2方+····+99方+100方的值

2025-04-07 14:12:12

推荐回答（1个）

回答（1）：

有求和公式的
Sigma(i^2, 1, n) = n * (n + 1) * (2n + 1) / 6
所以结果应该是 100 * 101 * 201 / 6 = 338350
这样算是效率最高的，效率为 O(1)，无论 n 多大都是一下算出来。。

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