县级以上人民政府统筹、协调、督促和指导有关部门在各自职责范围内做好网络犯罪防治工作。县级以上人民政府有关部门的网络犯罪防治监督管理职责，按照国家有关规定确定。
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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