The gains illustrate how fundamental design choices compound: batching amortizes async overhead, pull semantics eliminate intermediate buffering, and the freedom for implementations to use synchronous fast paths when data is available immediately all contribute.
// 步骤3：从后往前遍历数组（反向遍历更易理解，每个元素只入栈/出栈一次）
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const currentTime = posToTime.get(currentPos);，更多细节参见WPS下载最新地址