In 2011, hackers successfully cracked the main Linux development site, kernel.org. Afterward, to make sure this didn't happen again, the kernel's PGP web of trust was explicitly "bootstrapped" at a face-to-face key‑signing session during the 2011 Kernel Summit.
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Courtesy of Sharge，详情可参考91视频
3. 对每个桶内排序（可用任意排序算法），详情可参考Line官方版本下载
This is quick because it's operating on a very small, localized part of the map.