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)。
Мощный удар Израиля по Ирану попал на видео09:41
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Pat McFadden, the Work and Pensions Secretary, said the issue of young Neets was "a long-term challenge".
"Before that, in much of Europe, you could love as many people as you like, and love was fluid, and it was often not about sex."
Here's a subtle hint for today's Wordle answer:Lightheaded.