Solve the Problem

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The function IloRankForward returns a goal that ranks all resource constraints while minimizing makespan. By default, IloRankForward uses the resource selector IloSelResMinGlobalSlack to select the next resource to be ranked, and the resource constraint selector IloSelFirstRCMinStartMax to select the next resource constraint to be ranked first. IloSelResMinGlobalSlack selects a resource on which not all activities are ordered and that has minimal slack. (Slack is the difference between the demand for a resource and its availability over a specific period of time. For more information, see IlcDiscreteResource in the IBM ILOG Scheduler Reference Manual.)

    IloEnv env;
    IloNumVar makespan;
    IloModel model = DefineModel(env, makespan);
    
    IloSolver solver(model);

    IloGoal goal = IloRankForward(env, makespan);