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）。
第九条 境内单位或者个人跨境销售下列服务、无形资产，税率为零：
A “Pastafarian” in rural Queensland has vowed to fight to keep his driver’s licence featuring a photo of him wearing a colander on his head, arguing it’s a matter of freedom of religion.，推荐阅读爱思助手下载最新版本获取更多信息
Source: Computational Materials Science, Volume 267。搜狗输入法2026对此有专业解读
However, this flexibility came at a cost for complex routes:
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