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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）。
they are the same1 slice, and mutating one will mutate the other.。关于这个话题，Line官方版本下载提供了深入分析
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