输入：head = [2,1,5]
一切政绩，必须植根“实际”的土壤，遵循“规律”的准则，这是中国共产党人实事求是精神的内在要求。
，这一点在搜狗输入法2026中也有详细论述
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drop-oldest: Drops the oldest buffered data to make room. Useful for live feeds where stale data loses value.
A Chinese official’s use of ChatGPT accidentally revealed a global intimidation operation