Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:32:33 2012 Optimize a model with 405 rows, 127 columns and 810 nonzeros Presolve removed 98 rows and 4 columns Presolve time: 0.00s Presolved: 307 rows, 123 columns, 662 nonzeros Variable types: 0 continuous, 123 integer (123 binary) Found heuristic solution: objective 44.0000000 Root relaxation: objective 5.300000e+01, 142 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 53.00000 0 92 44.00000 53.00000 20.5% - 0s 0 0 51.75000 0 109 44.00000 51.75000 17.6% - 0s H 0 0 45.0000000 51.75000 15.0% - 0s 0 0 51.41176 0 117 45.00000 51.41176 14.2% - 0s H 0 0 47.0000000 51.41176 9.39% - 0s 0 0 51.30357 0 118 47.00000 51.30357 9.16% - 0s H 0 0 48.0000000 51.30357 6.88% - 0s 0 0 51.02655 0 122 48.00000 51.02655 6.31% - 0s 0 0 50.73600 0 118 48.00000 50.73600 5.70% - 0s 0 0 50.54340 0 117 48.00000 50.54340 5.30% - 0s 0 0 50.44979 0 119 48.00000 50.44979 5.10% - 0s 0 0 50.37703 0 119 48.00000 50.37703 4.95% - 0s 0 0 50.31579 0 115 48.00000 50.31579 4.82% - 0s 0 0 50.29268 0 119 48.00000 50.29268 4.78% - 0s 0 0 50.29268 0 117 48.00000 50.29268 4.78% - 0s 0 2 50.29268 0 116 48.00000 50.29268 4.78% - 0s * 7 3 4 49.0000000 50.24138 2.53% 30.3 0s Cutting planes: Zero half: 35 Explored 11 nodes (1043 simplex iterations) in 0.07 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 4.900000000000e+01, best bound 4.900000000000e+01, gap 0.0%