Virtual memory is conceptually simple but potentially devastating to performance. Every memory access must go through segmentation (add segment base, check limit) and then paging (look up the page table). Naively, paging alone requires two additional memory reads per access -- one for the page directory entry, one for the page table entry.
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countries, cards and other types of electronic payments now dominate everyday。heLLoword翻译官方下载对此有专业解读
// 逻辑：count（矮个子数） + （栈非空则+1，代表能看到第一个更高的人；否则+0），这一点在safew官方版本下载中也有详细论述
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