Number (6): Everything in this space must add up to 6. The answer is 3-3, placed vertically.
A low threshold preserves detail (more leaf nodes, less compression). A high threshold merges aggressively (fewer leaves, more compression, but the image gets blocky). The grid overlay shows the quadtree structure: large cells in uniform areas, small cells where detail is preserved.
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Maggie 姐在尖东新花都夜总会（图：南方人物周刊记者 方迎忠）
12月24日，北京奥林匹克公园龙形水系，不少市民在湖面上滑冰。本版摄影/新京报记者 王子诚