// 易错点3：必须先判断stack2.length0，再访问stack2.at(-1)（避免栈空时取到undefined）
It's relatively unchartered territory for the series, allowing production designer Alison Gartshore, costume designer John Glaser, and hair and makeup designer Nic Collins to consider what Bridgerton looks like if Wednesday Addams landed in the Ton. But it also allows for quietly moving performances from two characters we'll see much more of in the future.
，这一点在Line官方版本下载中也有详细论述
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 <= / =。
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