在输入框上方的模式切换里选择「文档」或「文章」
How does V86 work at the hardware level? When the VM bit (bit 17) of EFLAGS is set, the processor enters a hybrid state: it is still in protected mode with paging and privilege rings active, but most instructions execute as if the processor were in real mode. Segment addresses are computed as selector
。关于这个话题，同城约会提供了深入分析
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// 右侧第一个 <= cur 的元素, 所以用大于的就弹出