Work over the past year, using Cal-heatmap[4]
Grammarly and Ginger both have mobile apps.
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This is the same idea behind binary search. In a sorted array, you compare against the middle element and eliminate half the remaining candidates. In a quadtree, you choose one of four quadrants and ignore the other three regions. Each level narrows the search space by a factor of four instead of two.，这一点在Line官方版本下载中也有详细论述
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