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].
for (int i = 0; i < n; i++) {
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Courteney Cox and Neve Campbell in "Scream 7."
// 步骤2：初始化结果数组，默认值为0（后续无需再处理"无更大值"的情况）