3. 递归：对左右子数组递归执行1-2步
这个“近”，并非指盈利轻而易举，而是指在当前的技术与市场条件下，硬件提供了路径最短、摩擦力最小、且可被清晰计算的变现通道，体现在三个维度。
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（一）包含两个以上涉及不同税率、征收率的业务；
Another way to look at our threshold matrix is as a kind of probability matrix. Instead of offsetting the input pixel by the value given in the threshold matrix, we can instead use the value to sample from the cumulative probability of possible candidate colours, where each colour is assigned a probability or weight . Each colour’s weight represents it’s proportional contribution to the input colour. Colours with greater weight are then more likely to be picked for a given pixel and vice-versa, such that the local average for a given region should converge to that of the original input value. We can call this the N-candidate approach to palette dithering.