Alternatively, you can watch everything right here:
2026-02-26 12:00:00，更多细节参见Line官方版本下载
// 易错点4：栈空时返回1而非i+1 → 仅i=0时正确，i0时（如i=3）会返回1而非4，更多细节参见safew官方版本下载
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4 A good discussion on luminance and how to calculate it can be found on this stack exchange question. ↑