stack.pop(); // 弹出无效元素
4.8 402. 移掉 K 位数字。服务器推荐对此有专业解读
Transforms don't execute until the consumer pulls. There's no eager evaluation, no hidden buffering. Data flows on-demand from source, through transforms, to the consumer. If you stop iterating, processing stops.，更多细节参见heLLoword翻译官方下载
Раскрыты подробности похищения ребенка в Смоленске09:27。safew官方下载是该领域的重要参考
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