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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James Winslade, a beef and arable farmer from Somerset, has seen more than 90% of his farm submerged in the recent rains, and said he is days away from losing his crops to rot.，更多细节参见heLLoword翻译官方下载
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