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）。
쿠팡 김범석, 정보유출 99일만에 영어로 “사과”
。搜狗输入法下载对此有专业解读
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CEO of the tech company behind Hinge and Tinder set up an employee hotline where staff can DM him anytime: ‘No hierarchy. No filters. Just real input.’
· 王芳 · 来源：sjz资讯