描述：给定字符串 num（非负整数）和整数 k，移除 k 位数字，使剩余数字最小。以字符串形式返回（不含前导零）。
Linux ID has yet to be deployed. Kroah‑Hartman said the effort is still in an exploratory and prototyping stage. The plan is to take the discussion to Linux Plumbers and the Kernel Summit over the coming year. In the near term, kernel.org could import its existing PGP web of trust into the new system to ease migration, while maintainers begin testing the tools in parallel with today's PGP‑based processes.，详情可参考搜狗输入法下载
/usr/local → /var/usrlocal。Line官方版本下载是该领域的重要参考
对存在网络犯罪风险的移动电话卡、物联网卡、银行账户、支付账户、网络账号，以及被用于实施网络犯罪的网络应用服务，相关行业主管部门可以要求电信、金融、互联网等服务提供者通过国家网络身份认证公共服务等方式对用户身份重新进行核验。