The data is provided in the form of a matrix and three arrays.

For each activity and each worker, the matrix PossibleAssignments specifies whether or not the worker is able to perform the activity. For the sake of clean software-engineering, only the main function refers to these global variables. When we pass the value of a global variable as an argument to another function, we derive the name of the argument from the name of the global variable, but we do not capitalize the first character of the argument name.

IloInt NumberOfActivities = 10;
IloInt NumberOfWorkers = 3;
const char* ActivityNames [] = {"masonry   ",
                                "carpentry ",
                                "plumbing  ",
                                "ceiling   ",
                                "roofing   ",
                                "painting  ",
                                "windows   ",
                                "facade    ",
                                "garden    ",
                                "moving    "};
const char* WorkerNames [] = {"joe",
                              "jack",
                              "jim"};
IloNum ProcessingTimes  [] = {7, 3, 8, 3,  1,  2,  1,  2,  1,  1};
const char* PossibleAssignments [] = {"joe", "jack",     0,
                                      "joe",      0, "jim",
                                      0, "jack",     0,
                                      "joe",      0, "jim",
                                      "joe",      0, "jim",
                                      0, "jack", "jim",
                                      "joe",      0, "jim",
                                      "joe", "jack",     0,
                                      "joe", "jack", "jim",
                                      "joe",      0, "jim"}; 
 

As you can see from the matrix, either joe or jack can do masonry, but jim cannot. Only jack can do plumbing, but any of the three can work in the garden, and so forth.