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Step through the Python implementation. Watch the algorithm decide which branches to visit and which to prune:
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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.，这一点在WPS官方版本下载中也有详细论述
int left = 2 * i + 1; // 左子节点