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)。
What's the best Wordle starting word?The best Wordle starting word is the one that speaks to you. But if you prefer to be strategic in your approach, we have a few ideas to help you pick a word that might help you find the solution faster. One tip is to select a word that includes at least two different vowels, plus some common consonants like S, T, R, or N.
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