Cubes in the Torus

For $q> p$, let $T(n,q,p)$ be the minimum number of translates of the cube \(\{0,1,\dots,p-1\}^n\) required to cover the $n$-dimensional torus $(\mathbb{Z}/q\mathbb{Z})^n$. We show that for each $q$ there exists a constant $1\le Λ_q \le 2$ such that $T(n,q,2)=(Λ_q + o(1))(q/2)^n$.