简单讲，要做L3，需要先做L2积累数据。那么要做L4，也一样依赖L3的数据。技术上他们是一脉相承的，不存在一口就能吃个胖子的技术路线。
const stack = []; // 单调递增栈：栈底→栈顶数字递增，保证高位尽可能小
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Comer previously said that the committee can’t depose Trump because he is a sitting president.
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