What happens when we get to the return statements? first_function is called from both some_function and main—there isn’t just a single place that we can jump back to. The compiler doesn’t know when it’s generating the code for first_function who’s going to be calling it.
Москалькова назвала число удерживаемых на Украине жителей Курской области20:33，推荐阅读17c 一起草官网获取更多信息
* 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，详情可参考哔哩哔哩
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