2. 排序：将堆顶(最大值)与末尾交换，堆大小-1，重新调整堆
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.，这一点在safew官方版本下载中也有详细论述
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