n_jobs = 4;
n_machines = 2;
capacity = [5, 7];

job_duration = [4, 3, 5, 8];

requirement = [ 
	    2, 1, 2, 2, 
	    3, 5, 2, 4
];


precedences = [
	    0, 0, 0, 0,
	    0, 0, 1, 0,
	    0, -1, 0, 0,
	    0, 0, 0, 0
];