I want to know about the number of variables and constraints of this formulation (exp: $o(n)$ variables and constraints or $o(n^2)$ ....).
Is the number of variables $\mathcal O(n^3)$ because we have three index variables with $N\times N\times N$?
How can I compute the complexity of the constraints step by step? I would be grateful if you have any other examples or references explaining this question.