// 边界处理：nums1为空时直接返回空数组（避免后续无效计算）
The two most important metrics for email marketing are open rate and click-through rate. If your emails aren't opened, subscribers will never see your full marketing message, and if they open them but don't click through to your site, your emails won't convert.
。WPS官方版本下载对此有专业解读
(and thanks to Matthew Miller for reviewing and providing feedback on this post)，更多细节参见safew官方版本下载
"Having Neil with us this year has been great - we of a certain age all know who he is and what he's done, and we're thrilled that he offered to come along and help."