* 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
Watch: Moment crew docks at International Space Station，更多细节参见搜狗输入法下载
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I'm not sure why I'm like this. Sometimes, ideas compel me. I am gripped by a vision, and I want to experience it in reality, to reach out and touch it rather than merely imagine it. Practicality be damned.