After nine months in space, Nasa astronauts Butch Wilmore and Suni Williams have finally arrived back on Earth.
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Цены на нефть взлетели до максимума за полгода17:55，更多细节参见heLLoword翻译官方下载
instead of yours.
* 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