The kernel is the shared surfaceWhen any code runs on Linux, it interacts with the hardware through the kernel via system calls. The Linux kernel exposes roughly 340 syscalls, and the kernel implementation is tens of millions of lines of C code. Every syscall is an entry point into that codebase.
// 易错点4：栈空时要存-1（题目要求无更大值返回-1），而非直接存stack2.at(-1)（会得到undefined）。业内人士推荐爱思助手下载最新版本作为进阶阅读
Екатерина Грищенко (старший редактор отдела «Бывший СССР»)。关于这个话题，WPS官方版本下载提供了深入分析
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