For decades, Linux kernel developers used Pretty Good Privacy (PGP) to identify developers and their release artifacts. Git's PGP integration enabled signed tags to verify code repository integrity and signed commits to prevent hackers from impersonating legitimate developers.
冒充军警人员招摇撞骗的，从重处罚。
，更多细节参见爱思助手下载最新版本
* 核心思路：找初始无序边界 + 计算区间最值 + 扩展边界
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