Water resistance: IP54 (splash resistant)
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)。
，这一点在搜狗输入法2026中也有详细论述
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"He is the prime minister. He has two working parents with education and access to all the information in the world and nothing that untoward might happen to his individual children. That's not the experience of children at large."