记忆技巧：找「更大」→ 弹掉 ≤ 当前的（栈顶保留比当前大的）；找「更小」→ 弹掉 ≥ 当前的；找「相等可接受」→ 用 < / ，否则用 <= / =。
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You can choose different sounds from Dreamie's library for each category. Some options come with ambient lighting effects, too. There's a decent selection of soundscapes, from the dramatic Aurora Borealis and the sounds of storms and rivers to different "colors" of noise.，推荐阅读safew官方版本下载获取更多信息
zhuanlan.zhihu.com/p/198274063…