A Modified Priority-Based Encoding for Design of a Closed-Loop Supply Chain Network Using a Discrete League Championship Algorithm

Table 6

The average of the objective values for each sample problem instance.

Scale of the problem	Problem instance	CPLEX	PB1	PB2	PB3
Small	1	5216131.55	5216258.95	5216878.01	5216131.55
	2	6537367.23	6537605.34	6538131.72	6537367.23
	3	7709177.89	7709634.54	7710523.47	7709177.89
	4	9378103.61	9378752.72	9379025.74	9378103.61
	5	11611170.7	11612119.3	11612637.7	11611172.3
	6	12217294.9	12219232.9	12218828.6	12217296.1
	7	14546224.7	14547451.7	14547694.5	14546227.6
Medium	8	15642700.4	15645397.6	15644410.2	15642705.3
	9	16394986.2	16411886.8	16408650.5	16395010.8
	10	18192348.5	18209196.2	18199012.0	18192397.3
	11	19613086.9	19800951.6	19628863.7	19613153.8
	12	22984000.0	23693969.4	23485221.2	22984540.7
	13	25164851.6	26212668.5	26139382.5	25165442.0
	14	32156898.7	34013530.3	33511564.3	32157659.6