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answered 2017-07-25 09:11:50 -0600
a contour is a vector<Point> points, you access it's 2nd element by points[1], the coords are int x = points[1].x and int y = points[1].y
vector<Point> points
points[1]
int x = points[1].x
int y = points[1].y
(what's so difficult about it ?)