Table 6. Results of the three methods for solving the weakly heterogeneous classification and packing problem.

Examples	Item	Tsai, Wang & Lin (2015)	Tsai, Wang & Lin (2015)	Proposed method
		CPU time by LINGO	CPU time by CPLEX	CPU time by GUROBI
Problem07	Solution (L, W, H)	(127, 57, 30)	(127, 57, 30)	(127, 57, 30)
	CPU time (s)	66	2	0.50
Problem08	Solution (L, W, H)	(102, 95, 30)	(102, 95, 30)	(102, 95, 30)
	CPU time (s)	640	7	1.54
Problem09	Solution (L, W, H)	(92, 81, 50)	(92, 81, 50)	(92, 81, 50)
	CPU time (s)	01:30:42	00:01:16	4.38
Problem10	Solution (L, W, H)	(92, 81, 50)	(92, 81, 50)	(92, 81, 50)
	CPU time (s)	49503	414	135.31