Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:33:27 2012 Optimize a model with 502 rows, 141 columns and 1004 nonzeros Presolve removed 87 rows and 2 columns Presolve time: 0.00s Presolved: 415 rows, 139 columns, 876 nonzeros Variable types: 0 continuous, 139 integer (139 binary) Found heuristic solution: objective 47.0000000 Root relaxation: objective 6.075000e+01, 243 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 60.75000 0 117 47.00000 60.75000 29.3% - 0s 0 0 59.33333 0 135 47.00000 59.33333 26.2% - 0s 0 0 58.27368 0 136 47.00000 58.27368 24.0% - 0s 0 0 57.69304 0 138 47.00000 57.69304 22.8% - 0s H 0 0 49.0000000 57.69304 17.7% - 0s 0 0 57.35577 0 137 49.00000 57.35577 17.1% - 0s 0 0 57.08425 0 136 49.00000 57.08425 16.5% - 0s 0 0 57.03311 0 137 49.00000 57.03311 16.4% - 0s 0 0 56.96122 0 137 49.00000 56.96122 16.2% - 0s 0 0 56.64644 0 138 49.00000 56.64644 15.6% - 0s 0 0 56.57814 0 137 49.00000 56.57814 15.5% - 0s 0 0 56.42040 0 137 49.00000 56.42040 15.1% - 0s H 0 0 51.0000000 56.42040 10.6% - 0s 0 0 56.26883 0 137 51.00000 56.26883 10.3% - 0s 0 0 56.18425 0 136 51.00000 56.18425 10.2% - 0s 0 0 56.11609 0 137 51.00000 56.11609 10.0% - 0s 0 0 56.05568 0 137 51.00000 56.05568 9.91% - 0s 0 0 56.05568 0 137 51.00000 56.05568 9.91% - 0s 0 2 56.05537 0 137 51.00000 56.05537 9.91% - 0s H 9 9 52.0000000 56.05537 7.80% 45.3 0s * 56 9 7 53.0000000 55.27201 4.29% 47.0 0s Cutting planes: Zero half: 114 Explored 87 nodes (4921 simplex iterations) in 0.26 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 5.300000000000e+01, best bound 5.300000000000e+01, gap 0.0%