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）。
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。业内人士推荐safew官方版本下载作为进阶阅读
资源调度：弹性 CPU/GPU 资源按需使用，详情可参考safew官方下载
Tecno has always been a company that marched to the beat of its own drummer. It has developed a surprisingly affordable foldable phone, a model with a pop-out portrait lens and a foldable with a novel circular display on the exterior.