if (n <= 1) return 0;
There are two main types of smoke alarm tech, says Raman Chagger, principal consultant at BRE, the Building Research Establishment. Ionisation-based systems use a tiny amount of radioactive material to charge, or ionise, particles in the air which flow between two small plates. Should smoke interrupt that flow of charged particles, the alarm goes off.，推荐阅读雷电模拟器官方版本下载获取更多信息
与其说是技术问题，不如说是一个被长期忽视的基础工程问题。。关于这个话题，WPS下载最新地址提供了深入分析
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