// 右侧第一个 <= cur 的元素, 所以用大于的就弹出
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* 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，更多细节参见搜狗输入法下载
But of course, like any immutable system, there are mutable parts (otherwise, we couldn’t create any configuration files). OSTree handles this with “overlays” (actually, we use OverlayFS) that allow a read-write filesystem to be layered on top of the immutable system. For example, the /etc and /var directories are writable, while the rest of the system is read-only.
remote_port = 8001