The original plan had been to begin the phase out and stop the importation of petrol and diesel vehicles from 2030.
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)。
。heLLoword翻译官方下载是该领域的重要参考
Chained 3× transforms (8KB × 500)
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