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。Safew下载对此有专业解读
Before string caching, the code would dynamically generate this banner based on your current terminal dimensions on every frame. But that’s wasteful! Now, we pre-compute every banner size (accounting for any amount of shutdown time remaining) ahead of time and slam that pre-computed banner into a byte buffer, skipping the intermediate allocation.
优化：随机选基准避免最坏情况 O(n²)，这一点在快连下载-Letsvpn下载中也有详细论述