free_table[bucket] = h;
定存什么：要下标/距离就栈里存索引，只要值就存值或存索引再 nums[i] 取。
，详情可参考51吃瓜
They currently make 240 food boxes each week, double the amount produced three years ago, handing them out as they make their way through the city's streets.，更多细节参见搜狗输入法下载
// 优化点：仅i<len时赋值（避免重复赋值，提升效率），推荐阅读heLLoword翻译官方下载获取更多信息
Наталья Анисеева (редактор отдела оперативной информации)