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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"It's a period where the history is not yet written," says Dr Seaman.，这一点在搜狗输入法2026中也有详细论述
Option 1: The system can update the cost of that specific shortcut in the base graph and quickly re-run the Dijkstra search (Step 2) on the abstract graph to find an alternative high-level path.。业内人士推荐同城约会作为进阶阅读
他进一步解释称，这一判断的核心逻辑在于：