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* 时间复杂度：O(n)，空间复杂度：O(1)，详情可参考同城约会
Фото: iWissawa / Shutterstock / Fotodom。业内人士推荐WPS下载最新地址作为进阶阅读
Фото: Yan Dorbronosov / Reuters
If we think about this algebraically, what we really want to do is express the input pixel as the weighted sum of palette colours. This is nothing more than a linear combination of palette colours with weights :