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// 易错点3：必须先判断stack2.length0，再访问stack2.at(-1)（避免栈空时取到undefined）
。业内人士推荐同城约会作为进阶阅读
DECLRMM might work for us - it is approximately what we’re doing by deleting a character on each line when moving horizontally - but it has extremely poor terminal support so I didn’t want to rely on it.
A notable resource on the topic of ordered dithering using arbitrary palettes is Joel Yliluoma’s Arbitrary-Palette Positional Dithering Algorithm. One key difference of Yliluoma’s approach is in the use of error metrics beyond the minimisation of . Yliluoma notes that the perceptual or psychovisual quality of the dither must be taken into account in addition to its mathematical accuracy. This is determined by use of some cost function which considers the relationship between a set of candidate colours. The number of candidates, the particular cost function, and the thoroughness of the selection process itself give rise to a number of possible implementations, each offering varying degrees of quality and time complexity.