It takes n-1 times to calculate Cn, and one subtraction, one division and one addition to calculate R, a total of (n+2) operations. <br>The scanning sequence is: the <br>mask slides from left to right on the image, when it reaches the right border of the image, slide down, and then slide from right to left. When you reach the left border of the image, swipe down, and then swipe from left to right.
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