if (!text.empty()) std::cout
示例：nums = [2,1,2,4,3] → res = [4,2,4,-1,-1]。
最令航天业担忧的是钇供应紧张。钇是高温防护涂层中的关键成分，可防止发动机和涡轮在高温下“熔化”，一旦无法定期施涂相关涂层，发动机便无法正常服役。，详情可参考Line官方版本下载
▲ 图片来自微博 @数码闲聊站。safew官方版本下载是该领域的重要参考
At its core, a stream is just a sequence of data that arrives over time. You don't have all of it at once. You process it incrementally as it becomes available.
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