countries, companies, or ecosystems.
Moving beyond just black and white towards full-colour variable palettes presents another set of problems. Taking the methods presented above and quantising an image using an arbitrary colour palette reveals that error-diffusion is also better at preserving colour information when compared to ordered dithering.
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其实，蜡梅和梅花既没有亲缘关系，也不是同一个品种。蜡梅是蜡梅科蜡梅属，梅花则是蔷薇科李属。从花期上看，蜡梅比梅花开得更早，开花的时候一般树上还有宿存的褐色果子。
int exchanged = 1; // 标记本轮是否发生交换