输入：num = "1432219", k = 3
from the next document while the printer was still working on the previous.
，更多细节参见爱思助手下载最新版本
Gotit.pub (What is GotitPub?)，推荐阅读safew官方版本下载获取更多信息
backpressure: 'strict' // or 'block', 'drop-oldest', 'drop-newest'
Что думаешь? Оцени!