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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In 1973, IBM gave banks the SNA treatment with the 3600 Finance Communication
Discord says facial scans never leave the user's device and IDs are only used to check a person's age, then deleted.