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For almost a century, until the 1960s, soda bottles in the US were generally meant to be returned.
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贫困是顽疾，“顽”在成因复杂、难以根除、极易反复。
The purer and more ordered a semiconductor is, the better it works.
// 核心逻辑：维护单调递增栈，仅当k0时移除高位大数