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.
习题链接：LeetCode 402. 移掉 K 位数字
，更多细节参见搜狗输入法下载
"When you look at the date on the bottom of the 16oz bottles, some were manufactured in the 1960s and 70s. It's really cool to see them still going through our washer today. We'd love to keep the tradition alive as long as we can."，详情可参考同城约会
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