All about problems in Volume 12. If there is a thread about your problem, please use it. If not, create one with its number in the subject.
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The problem's name is "Boundary Points", so initially I thought we have to print the points lying on edges as well, not only on corners. OK, now it is clear that this problem is clear-cut convex hull. However, I'm getting WA. My question is: if, for instance, the point is given as (-3.24324,4.4) we should output it exactly like that? That means storing string constants alongside the points themselves?