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）。
Batch extraction — select multiple files and extract them all at once
，详情可参考旺商聊官方下载
def __init__(self, config: Config):。谷歌浏览器【最新下载地址】是该领域的重要参考
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