Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:34:57 2012 Optimize a model with 545 rows, 148 columns and 1090 nonzeros Presolve removed 113 rows and 5 columns Presolve time: 0.00s Presolved: 432 rows, 143 columns, 927 nonzeros Variable types: 0 continuous, 143 integer (143 binary) Found heuristic solution: objective 49.0000000 Root relaxation: objective 6.250000e+01, 214 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 62.50000 0 111 49.00000 62.50000 27.6% - 0s 0 0 60.75000 0 133 49.00000 60.75000 24.0% - 0s 0 0 60.02037 0 142 49.00000 60.02037 22.5% - 0s 0 0 58.96316 0 142 49.00000 58.96316 20.3% - 0s H 0 0 51.0000000 58.96316 15.6% - 0s H 0 0 53.0000000 58.96316 11.3% - 0s 0 0 58.73007 0 141 53.00000 58.73007 10.8% - 0s 0 0 58.48613 0 142 53.00000 58.48613 10.4% - 0s 0 0 58.21970 0 142 53.00000 58.21970 9.85% - 0s 0 0 57.98283 0 142 53.00000 57.98283 9.40% - 0s 0 0 57.94925 0 142 53.00000 57.94925 9.34% - 0s 0 0 57.94925 0 140 53.00000 57.94925 9.34% - 0s 0 2 57.94424 0 140 53.00000 57.94424 9.33% - 0s Cutting planes: Gomory: 2 Zero half: 130 Explored 402 nodes (12493 simplex iterations) in 0.48 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%