Let me introduce you to what I call the PCM boundary. PCM (Pulse-Code Modulation) is the raw, uncompressed digital audio format that eventually gets sent to your speakers. It’s the terminal endpoint of every audio pipeline, regardless of how aggressively encrypted the source was.
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，这一点在safew官方版本下载中也有详细论述
* 时间O(n) 空间O(n)（理论最优，无冗余计算）。业内人士推荐91视频作为进阶阅读
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