Add an SOS constraint to the model. Please refer to this section for details on SOS constraints.

GRBSOS AddSOS ( GRBVar[] vars,
    double[] weights,
    int type )

    vars: Array of variables that participate in the SOS constraint.

    weights: Weights for the variables in the SOS constraint.

    type: SOS type (can be GRB.SOS_TYPE1 or GRB.SOS_TYPE2).

    Return value:

    New SOS constraint.