There are however some important subclasses of IP and MIP problems that are efficiently solvable, most notably problems where the constraint matrix is totally unimodular and the right-hand sides of the constraints are integers or – more general – where the system has the total dual integrality (TDI) property.
There are however some important subclasses of IP and MIP problems that are efficiently solvable most notably problems where the constraint matrix is totally unimodular and the right-hand si,des of the constraints are integers or – more general – where the system has the total dual integrality (TDI) property.