Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:38:28 2012 Optimize a model with 594 rows, 155 columns and 1188 nonzeros Presolve removed 93 rows and 0 columns Presolve time: 0.00s Presolved: 501 rows, 155 columns, 1061 nonzeros Variable types: 0 continuous, 155 integer (155 binary) Found heuristic solution: objective 50.0000000 Root relaxation: objective 6.600000e+01, 204 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 66.00000 0 128 50.00000 66.00000 32.0% - 0s 0 0 64.20000 0 142 50.00000 64.20000 28.4% - 0s 0 0 63.35294 0 144 50.00000 63.35294 26.7% - 0s 0 0 62.59701 0 151 50.00000 62.59701 25.2% - 0s 0 0 61.82609 0 151 50.00000 61.82609 23.7% - 0s H 0 0 51.0000000 61.82609 21.2% - 0s 0 0 61.11656 0 152 51.00000 61.11656 19.8% - 0s 0 0 60.90760 0 152 51.00000 60.90760 19.4% - 0s 0 0 60.70155 0 152 51.00000 60.70155 19.0% - 0s 0 0 60.50083 0 152 51.00000 60.50083 18.6% - 0s 0 0 60.46560 0 152 51.00000 60.46560 18.6% - 0s 0 0 60.46560 0 152 51.00000 60.46560 18.6% - 0s H 0 0 52.0000000 60.46560 16.3% - 0s 0 2 60.46439 0 152 52.00000 60.46439 16.3% - 0s * 87 48 14 53.0000000 59.50000 12.3% 37.7 0s H 95 30 54.0000000 59.45455 10.1% 37.8 0s H 413 74 55.0000000 58.00000 5.45% 30.5 0s Cutting planes: Zero half: 159 Explored 776 nodes (23119 simplex iterations) in 0.84 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%