* 核心思路：单调递增栈 + 控制删除位数（k0），优先移除高位大数，保证剩余数字最小
Researchers discover rare periods of a few thousands years when climate unexpectedly awoke from slumber，详情可参考夫子
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Dr Fraser Hunter, Iron Age and Roman curator at National Museums Scotland, said: "I've looked at carnyces from around Europe, and the full research and conservation of these incredibly fragile remains will reshape our view of sound and music in the Iron Age."