Let flattening (assoc)
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，更多细节参见新收录的资料
Гуменник рассказал о переживаниях перед финалом Гран-при России17:42。关于这个话题，新收录的资料提供了深入分析
“If the USA Women’s Hockey team wants a real celebration and invite ,,, I’ll host them in Las Vegas. Do some nice dinners and shows and good times,” he wrote. “I’m sure I can get a hotel and airline to help me out here and celebrate these women for real for real.”，这一点在新收录的资料中也有详细论述
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)。