Hand-Coded Weights (Constructive Proofs)
Optical-based smoke alarms use light instead. They are slightly better at detecting the large smoke particles created by slow, smouldering fires. When such particles enter a chamber in the device, they scatter light from a small light source, which is then picked up by a photoelectric sensor.。业内人士推荐Line官方版本下载作为进阶阅读
// 3. 要求稳定排序: 归并排序，更多细节参见heLLoword翻译官方下载
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