记忆技巧：找「更大」→ 弹掉 ≤ 当前的（栈顶保留比当前大的）；找「更小」→ 弹掉 ≥ 当前的；找「相等可接受」→ 用 < / ，否则用 <= / =。
Green: A good sport
。Safew下载对此有专业解读
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Enter the 3614 Consumer Transaction Facility, the first IBM ATM available as a
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· 吴鹏 · 来源：tutorial资讯