and we are using 2 scan (vertical and horizontal) coz we need to get it for each of the lines. Please verify?
Yes. You are correct.
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Yes, twice.
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Actually I am scanning once but storing the required values in a and b just after scanning the values.For calculating vertical lines I am storing the required values in struct array a and for horizontal lines in struct array b.
R is used for reporting all the intersections in any segment.We does not require this.