Gurobi 5.0.1 (linux64) logging started Fri Nov 16 03:23:20 2012 Optimize a model with 4535 rows, 1806 columns and 15202 nonzeros Presolve removed 1178 rows and 2 columns Presolve time: 0.10s Presolved: 3357 rows, 1804 columns, 12186 nonzeros Variable types: 0 continuous, 1804 integer (1804 binary) Found heuristic solution: objective 42.0000000 Root relaxation: objective 3.000000e+00, 2978 iterations, 0.29 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 3.00000 0 384 42.00000 3.00000 92.9% - 0s H 0 0 37.0000000 3.00000 91.9% - 0s H 0 0 15.0000000 3.00000 80.0% - 1s 0 0 3.00000 0 1130 15.00000 3.00000 80.0% - 1s H 0 0 6.0000000 3.00000 50.0% - 1s H 0 0 4.0000000 3.00000 25.0% - 1s 0 0 3.00000 0 339 4.00000 3.00000 25.0% - 2s 0 0 3.00000 0 89 4.00000 3.00000 25.0% - 3s 0 0 3.00000 0 93 4.00000 3.00000 25.0% - 5s 0 0 3.00000 0 79 4.00000 3.00000 25.0% - 6s 0 0 3.00000 0 98 4.00000 3.00000 25.0% - 7s 0 0 3.00000 0 98 4.00000 3.00000 25.0% - 7s 0 2 3.00000 0 98 4.00000 3.00000 25.0% - 9s 2 3 3.00000 1 98 4.00000 3.00000 25.0% 1472 10s 7 6 3.00000 1 60 4.00000 3.00000 25.0% 420 16s 10 8 3.00000 1 75 4.00000 3.00000 25.0% 294 21s 13 12 3.00000 10 129 4.00000 3.00000 25.0% 5128 26s Cutting planes: Gomory: 1 Clique: 1 Zero half: 13 Explored 21 nodes (118147 simplex iterations) in 28.72 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 4.000000000000e+00, best bound 4.000000000000e+00, gap 0.0%