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)。
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Radio 2 in the Park is the station's annual flagship live music event, bringing some of the biggest UK and international artists to cities that may not otherwise host such a large-scale event.
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