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* 时间复杂度：O(n log n)（主要来自排序），空间复杂度：O(n)。同城约会对此有专业解读
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.
Жители Санкт-Петербурга устроили «крысогон»17:52