/etc is also writable, but it’s managed a bit differently. OSTree uses a technique called “etc overlay” to handle modifications in /etc. When an update is applied, OSTree compares files in the new version with those in /etc and applies changes intelligently, preserving local modifications as much as possible.
phase[classno] = 1;
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“At the end of the day, that actually takes a lot of money and resources to do this.”
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* 时间复杂度: O(n²) 最好: O(n) 空间复杂度: O(1) 稳定: ✓
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