Many observers believe North Korean leader has decided daughter Kim Ju-ae will succeed him, but others say gender politics could block her path to power
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Мерц резко сменил риторику во время встречи в Китае09:25
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)。