Note that you do not have to use int and you should not
输入：num = "1432219", k = 3，更多细节参见同城约会
（十一）泄露办理治安案件过程中的工作秘密或者其他依法应当保密的信息的；，详情可参考同城约会
At capacity 1, every point gets its own cell, and the tree subdivides as deeply as possible. At capacity 10, many points coexist in the same node, and the tree stays shallow.，详情可参考WPS下载最新地址
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