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4.4 1019. 链表中的下一个更大节点。业内人士推荐同城约会作为进阶阅读
黎智英欺詐案上訴得直：定罪及刑罰被撤銷，出獄時間提前，详情可参考夫子
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The spatial view (the grid of rectangles) and the tree view (the hierarchy of nodes) represent the same structure. Searching for a point means walking down the tree: at each node, you check which of the four children contains your target coordinate and recurse into that child. You never visit the other three.