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标签: 容斥原理

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4. 基础数学初识
4.1 质数 概念 质数又称素数,一个大于11的自然数,除了11和它自身外,不能被其他自然数整除的数叫做质数;否则称为合数(规定1既不是质数也不是合数) 4.1.1 试除法判定质数 思想 N<2N<2不是质数 从i=2i=2开始枚举,直到n\sqrt{n},若ii能被NN整除,说明不是质…

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