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Most cases in children are mild, although they will feel unwell and will need to miss school or nursery for several days.
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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 :
// 易错点6：返回整个数组（如this.res）→ 不符合题目要求，题目要求返回单个数值