Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:34:55 2012 Optimize a model with 526 rows, 148 columns and 1052 nonzeros Presolve removed 100 rows and 3 columns Presolve time: 0.00s Presolved: 426 rows, 145 columns, 914 nonzeros Variable types: 0 continuous, 145 integer (145 binary) Found heuristic solution: objective 47.0000000 Root relaxation: objective 6.375000e+01, 277 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 63.75000 0 132 47.00000 63.75000 35.6% - 0s H 0 0 49.0000000 63.75000 30.1% - 0s 0 0 62.91667 0 138 49.00000 62.91667 28.4% - 0s 0 0 62.32143 0 141 49.00000 62.32143 27.2% - 0s 0 0 61.29104 0 140 49.00000 61.29104 25.1% - 0s H 0 0 50.0000000 61.29104 22.6% - 0s 0 0 60.70862 0 141 50.00000 60.70862 21.4% - 0s 0 0 60.34353 0 142 50.00000 60.34353 20.7% - 0s H 0 0 52.0000000 60.34353 16.0% - 0s 0 0 60.23161 0 141 52.00000 60.23161 15.8% - 0s 0 0 59.99105 0 140 52.00000 59.99105 15.4% - 0s 0 0 59.85454 0 140 52.00000 59.85454 15.1% - 0s 0 0 59.73877 0 140 52.00000 59.73877 14.9% - 0s 0 0 59.58241 0 140 52.00000 59.58241 14.6% - 0s 0 0 59.47822 0 145 52.00000 59.47822 14.4% - 0s 0 0 59.32318 0 141 52.00000 59.32318 14.1% - 0s 0 0 59.22424 0 143 52.00000 59.22424 13.9% - 0s 0 0 59.20692 0 145 52.00000 59.20692 13.9% - 0s 0 0 59.20692 0 141 52.00000 59.20692 13.9% - 0s 0 2 59.20679 0 141 52.00000 59.20679 13.9% - 0s * 34 22 9 53.0000000 59.15101 11.6% 36.7 0s * 112 38 15 54.0000000 58.04545 7.49% 36.2 0s * 360 40 5 55.0000000 57.11688 3.85% 32.2 0s Cutting planes: Zero half: 159 Explored 463 nodes (15776 simplex iterations) in 0.66 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 5.500000000000e+01, best bound 5.500000000000e+01, gap 0.0%