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 <= / =。
Жители Санкт-Петербурга устроили «крысогон»17:52
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The policy is "all stick, no carrot", says de Bolle of the Peterson Institute. "And it doesn't seem like they understand that they do need carrots."