OJ Board

I've been having some problems with this program. Here is what I have so far, which gets a runtime error due to invalid memory reference (hopefully it will help some of you out too):

#include<iostream>
#include<iomanip>
#include<vector>
#include<algorithm>
#include<cmath>
using namespace std ...

I've been working on this problem too, and I think I'm running into the same problem as you were. I can't figure out an efficient way to add the origin to the hull (the posted code didn't appear to be adding it correctly, since it went straight from two points on the hull to the origin without ...

How did you end up dealing with the origin point? I mean, how do you choose the two points the origin connects to?