For implementers, the locking model adds a fair amount of non-trivial internal bookkeeping. Every operation must check lock state, readers must be tracked, and the interplay between locks, cancellation, and error states creates a matrix of edge cases that must all be handled correctly.
百亿和十亿级别的企业研发投入总和1.76 万亿元，以6.39%的企业总数（378 家），占到全部研发投入的六成（64.94%）。
。关于这个话题，搜狗输入法下载提供了深入分析
1. 找出最大数，确定最大位数d
// 逻辑：这些数比当前元素小/相等，不可能成为「左侧元素的下一个更大值」，直接移除
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