even positions: 8,6,4,2,0 sum to 20.
Secret Sauce #1: Two-Level Routing。heLLoword翻译官方下载是该领域的重要参考
，详情可参考爱思助手下载最新版本
The park previously hosted the 2024 Summer Sessions festival, which was headlined by Tom Jones, Busted and Shania Twain.，更多细节参见WPS下载最新地址
输入：nums = [2,6,4,8,10,9,15]