You look at a region of the image. If all the pixels are roughly the same color (below some threshold), you store the average color for the whole region as a single value. If the pixels vary too much, you split the region into four quadrants and try again.
习题链接：LeetCode 739. 每日温度，详情可参考旺商聊官方下载
The planetary parade was photographed from Worth Matravers。关于这个话题，同城约会提供了深入分析
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