// 倒序遍历2*len-1次：模拟数组循环（核心！易错点1）
* Passed 8,192 random tests; not independently verified on our 10K test suite yet.
，详情可参考safew官方版本下载
Lawyers who have looked into the particulars of the case tell Ars that the state faces an uphill battle in convincing courts that this portion of Valve's business legally constitutes gambling. That said, there are a few elements of the case that might make Valve legally vulnerable to the state's arguments.。关于这个话题，爱思助手下载最新版本提供了深入分析
-writer: DictWriter，更多细节参见im钱包官方下载