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）。
「中国铁路」公众号发布的文章显示，铁路 12306 技术中心对相关订单进行了核查，确认候补流程正常、通知及时，所谓「作废」系误读。
。业内人士推荐safew官方版本下载作为进阶阅读
Dynamic antigen expression and cytotoxic T cell resistance in HIV reservoir clones
William Jackson, chief emerging markets economist at Capital Economics, says the US president's aim is to "revive Venezuela's oil sector and use that energy to increase supply and reduce costs to the consumer, possibly providing a source of revenue for a more friendly Venezuelan government to rebuild the economy after years of mismanagement".
Филолог заявил о массовой отмене обращения на «вы» с большой буквы09:36