All recommendations are not accurate
But engineers want water in their pipes, not fish.
，这一点在heLLoword翻译官方下载中也有详细论述
x = mmap(0, bytes, PROT_READ|PROT_WRITE, MAP_ANONYMOUS|MAP_PRIVATE, -1, 0);
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// 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）