// 核心逻辑：维护单调递增栈，仅当k0时移除高位大数
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，这一点在91视频中也有详细论述
Increased burning of fossil fuels like coal and oil over the last two centuries has released greenhouse gases like CO2 into the atmosphere, which have warmed our planet.，推荐阅读WPS官方版本下载获取更多信息
Елизавета Городищева (Редактор отдела «Экономика»)