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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According to Uefa, Chelsea’s losses were more than double the second-worst in Europe, the £171m posted by Lyon. The figures are also about £260m worse than those posted by the Blues in 2023-24.
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俄罗斯、英国、日本、东南亚的客人们，会自带翻译前来了解。