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you can't assume, there's always something in your vector, so you need to care for the case it's empty:

if (points.size() > 0) { points[0].x points[0].y }

you can't assume, there's always something in your vector, so you need to care for the case it's empty:

if (points.size() > 0)
{
points[0].x
points[0].y
}
}