Solving a simple problem

Dear all,

I have a little problem in C++.
My objective is the next:

I have to count frames (OpenCV), and detect a certain amount of objects, through a vector (int). To do this, no problem, it is trivial.
But I would like to print the frame -1 (No problem) and the number of detected object in the frame -1. I don't know how to do that.

In fact, my question is: How to retreive the value of a vector affected to the frame -1 ?

Thanks for your help.

Chris
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