Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:37:14 2012 Optimize a model with 613 rows, 152 columns and 1226 nonzeros Presolve removed 136 rows and 0 columns Presolve time: 0.00s Presolved: 477 rows, 152 columns, 1044 nonzeros Variable types: 0 continuous, 152 integer (152 binary) Found heuristic solution: objective 46.0000000 Root relaxation: objective 6.200000e+01, 222 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 62.00000 0 122 46.00000 62.00000 34.8% - 0s 0 0 60.75000 0 143 46.00000 60.75000 32.1% - 0s 0 0 59.79756 0 150 46.00000 59.79756 30.0% - 0s H 0 0 48.0000000 59.79756 24.6% - 0s 0 0 58.75838 0 151 48.00000 58.75838 22.4% - 0s 0 0 58.45714 0 149 48.00000 58.45714 21.8% - 0s 0 0 57.96474 0 150 48.00000 57.96474 20.8% - 0s H 0 0 49.0000000 57.96474 18.3% - 0s 0 0 57.94891 0 151 49.00000 57.94891 18.3% - 0s H 0 0 50.0000000 57.94891 15.9% - 0s 0 0 57.73146 0 147 50.00000 57.73146 15.5% - 0s 0 0 57.59074 0 147 50.00000 57.59074 15.2% - 0s H 0 0 51.0000000 57.59074 12.9% - 0s 0 0 57.52945 0 146 51.00000 57.52945 12.8% - 0s 0 0 57.43974 0 150 51.00000 57.43974 12.6% - 0s 0 0 57.34243 0 152 51.00000 57.34243 12.4% - 0s 0 0 57.29289 0 152 51.00000 57.29289 12.3% - 0s 0 0 57.29289 0 151 51.00000 57.29289 12.3% - 0s 0 2 57.29289 0 150 51.00000 57.29289 12.3% - 0s H 28 15 52.0000000 57.19284 10.0% 54.3 0s Cutting planes: Zero half: 161 Explored 943 nodes (40088 simplex iterations) in 1.65 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 5.200000000000e+01, best bound 5.200000000000e+01, gap 0.0%