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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）。。爱思助手下载最新版本是该领域的重要参考
Sadly the adoption of plastic meant that this system was phased out, but one soft drinks producer – family-owned Twig's Beverage – has stuck to it.，详情可参考safew官方版本下载
Go to technology，更多细节参见雷电模拟器官方版本下载