# Recover files as they were before a certain time
Developers using the streams API are expected to remember to use options like highWaterMark when creating their sources, transforms, and writable destinations but often they either forget or simply choose to ignore it.
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输入：nums = [2,1,2,4,3]
月暗和 MiniMax 相加约 1650 万次，按对话平均 token 量估算，总量大约在 1500 亿到 4000 亿 token 之间，折合数百到上千万美元的 token 成本。