// 易错点2：遍历结束后k仍0 → 栈是递增的，末尾数字更大，移除末尾k位
"I implore everybody not just to make their wishes known but to talk to their friends and their family and also find out what their friends and family want," she said.
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Another way to approach dithering is to analyse the input image in order to make informed decisions about how best to perturb pixel values prior to quantisation. Error-diffusion dithering does this by sequentially taking the quantisation error for the current pixel (the difference between the input value and the quantised value) and distributing it to surrounding pixels in variable proportions according to a diffusion kernel . The result is that input pixel values are perturbed just enough to compensate for the error introduced by previous pixels.