res[i] = stack.length ? stack.at(-1) : -1;
03 全球格局已定中美两条路，两种未来
，这一点在快连下载安装中也有详细论述
Here's how each policy behaves when a producer writes faster than the consumer reads:
当你们开启职业生涯，你们也会面临选择。你们正处在一个技术突破不断涌现的时代，新路径与新机会正在展开。
The x86 protection model is notoriously complex, with four privilege rings, segmentation, paging, call gates, task switches, and virtual 8086 mode. What's interesting from a hardware perspective is how the 386 manages this complexity on a 275,000-transistor budget. The 386 employs a variety of techniques to implement protection: a dedicated PLA for protection checking, a hardware state machine for page table walks, segment and paging caches, and microcode for everything else.