Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:37:17 2012 Optimize a model with 582 rows, 152 columns and 1164 nonzeros Presolve removed 118 rows and 0 columns Presolve time: 0.00s Presolved: 464 rows, 152 columns, 1001 nonzeros Variable types: 0 continuous, 152 integer (152 binary) Found heuristic solution: objective 45.0000000 Root relaxation: objective 6.235714e+01, 280 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 62.35714 0 138 45.00000 62.35714 38.6% - 0s H 0 0 48.0000000 62.35714 29.9% - 0s 0 0 61.24126 0 148 48.00000 61.24126 27.6% - 0s 0 0 60.18065 0 151 48.00000 60.18065 25.4% - 0s 0 0 59.47416 0 147 48.00000 59.47416 23.9% - 0s 0 0 59.07062 0 150 48.00000 59.07062 23.1% - 0s 0 0 58.90220 0 149 48.00000 58.90220 22.7% - 0s 0 0 58.65898 0 152 48.00000 58.65898 22.2% - 0s H 0 0 49.0000000 58.65898 19.7% - 0s 0 0 58.56965 0 151 49.00000 58.56965 19.5% - 0s H 0 0 50.0000000 58.56965 17.1% - 0s 0 0 58.52412 0 149 50.00000 58.52412 17.0% - 0s 0 0 58.41523 0 151 50.00000 58.41523 16.8% - 0s 0 0 58.38846 0 152 50.00000 58.38846 16.8% - 0s 0 0 58.38846 0 151 50.00000 58.38846 16.8% - 0s H 0 0 51.0000000 58.38846 14.5% - 0s H 0 0 52.0000000 58.38846 12.3% - 0s H 0 0 53.0000000 58.38846 10.2% - 0s 0 2 58.38846 0 151 53.00000 58.38846 10.2% - 0s Cutting planes: Zero half: 132 Explored 628 nodes (22148 simplex iterations) in 0.90 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%