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5.1-如何高效寻找素数.md
素数的定义看起来很简单,如果一个数如果只能被 1 和它本身整除,那么这个数就是素数。 不要觉得素数的定义简单,恐怕没多少人真的能把素数相关的算法写得高效。比如让你写这样一个函数: 这样写的话时间复杂度 O(n^2),问题很大。首先你用 isPrime 函数来 ...
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