需要索引（如算距离、下标）：栈存索引，用 nums[stack.at(-1)] 取值比较。
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，更多细节参见雷电模拟器官方版本下载
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All of the examples demonstrating ordered dithering so far have been produced using a specific type of threshold matrix commonly known as a Bayer matrix. In theory however any matrix could be used and a number of alternatives are available depending on your qualitative preference. Matrices also don’t have to be square or even rectangular; polyomino-based dithering matrices have been explored as well[6].，推荐阅读safew官方版本下载获取更多信息