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 :
Елизавета Городищева (Редактор отдела «Экономика»)
，详情可参考51吃瓜
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Not Equal: Everything in this space must be different. The answer is 2-2, placed horizontally; 4-4, placed vertically; 0-0, placed vertically.