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）。
The Department for Environment, Food & Rural Affairs (Defra) said "every household in England" would get weekly food waste collections from next month under new legislation, but 79 councils told the BBC they would not meet that deadline.
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They warn that as SpaceX chief Elon Musk pledges to launch one million satellites in the coming years, this contamination could be the tip of the iceberg.，更多细节参见同城约会
Следующая трехсторонняя встреча по Украине пройдет в начале марта. Место ее проведения не раскрывалось.。WPS下载最新地址是该领域的重要参考
Овечкин продлил безголевую серию в составе Вашингтона09:40