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）。
DEC as a result. These would eventually blossom into the extremely successful
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A spam-blocking feature that saves disk space and makes your site run faster.
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href = a.get("href", "")