* 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
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In one young couple's diary given to them for the project, Sumaira describes her partner coming home, the dinner she has cooked, the hug in the hallway, the two of them eating together at the table.
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should consider how a stack-heavy application can benefit from multiple