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）。
Yungblud's team has said he felt it was was "important" for his fans in Europe to have a chance to experience the festival.
。业内人士推荐夫子作为进阶阅读
More hits than misses on content generated
技术核心：小数据量样本、高数据使用效率