If we could simply rewind time and watch the code execute exactly as it did for those failed requests, life would be a lot easier.
优化：如果某轮没有发生交换，说明已有序，提前结束
。下载安装 谷歌浏览器 开启极速安全的 上网之旅。是该领域的重要参考
This is of course, what many operating systems do with the stack, but
How photographer captured six planets in 'parade'
Reporting from, 台北