Credit: Timothy Beck Werth / Mashable
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栈（stack）是先进后出的数据结构。单调栈在入栈时通过一定规则保持栈内元素有序（单调递增或单调递减），从而把「找左侧/右侧第一个更大/更小元素」从 O(n²) 降到 O(n)。，详情可参考新收录的资料
Looking for the best preorder deal on Pokémon TCG Mega Evolution Perfect Order Booster Bundles? Amazon is offering excellent value for money.。业内人士推荐新收录的资料作为进阶阅读
if (len1 === 0) return [];
一张图片背后，发布者的身份往往比内容本身更能说明问题。。新收录的资料是该领域的重要参考