输入：num = "1432219", k = 3
海南会文，有“中国佛珠小镇”之称。封关后的第一个春节，南方周末记者走访商户们所见到的变化。
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The quadtree is the two-dimensional case of a broader family of space-partitioning data structures. Octrees extend the same idea to three dimensions (splitting cubes into eight children), KD-trees use alternating axis-aligned splits (splitting along x, then y, then x again), and R-trees group nearby objects into bounding rectangles. Each variant makes different tradeoffs between construction time, query speed, and update cost.，推荐阅读Line官方版本下载获取更多信息
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Exclusive: memo came after Mike Huckabee’s remarks about Israel sparked alarm inside White House