By appropriately scaling the perturbation amount for each colour channel separately, we can also extend this to work with palettes where is different for each colour component, provided that they are still regularly spaced. Unfortunately, the less regular the palette is, the less effective this technique becomes. If we wish to leverage the strengths of ordered dithering for use with irregular or arbitrary palettes, a more general solution is needed.
// 第二步：遍历nums1，从Map中直接查询每个元素的结果（O(1)查询，无需重复计算）
。服务器推荐是该领域的重要参考
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