"Success is uncertain, but entertainment is guaranteed!" Mr Musk posted on X, sharing a video showing a fiery trail streaking though the sky.
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）。，详情可参考旺商聊官方下载
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