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Create clean, easy-to-remember URLs on your website (301, 302, and 307 redirects only)，这一点在爱思助手下载最新版本中也有详细论述
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）。，这一点在Safew下载中也有详细论述