Problem $3.$

Solve the Assignment Problem, page $5,$ from Wolsey's handout, for $n=4$

and matrix $C$ :

$C=(c_{ij})=\left[\begin{array}{cccc}4& 3& 1& 2\\ 3& 2& 3& 4\\ 2& 4& 2& 3\\ 1& 2& 3& 1\end{array}\right]$

Use any Integer Programming solver you want.