Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:32:29 2012 Optimize a model with 426 rows, 124 columns and 852 nonzeros Presolve removed 77 rows and 1 columns Presolve time: 0.00s Presolved: 349 rows, 123 columns, 751 nonzeros Variable types: 0 continuous, 123 integer (123 binary) Found heuristic solution: objective 39.0000000 Root relaxation: objective 5.300000e+01, 163 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 90 39.00000 53.00000 35.9% - 0s H 0 0 40.0000000 53.00000 32.5% - 0s 0 0 52.22222 0 116 40.00000 52.22222 30.6% - 0s H 0 0 44.0000000 52.22222 18.7% - 0s 0 0 50.67857 0 116 44.00000 50.67857 15.2% - 0s H 0 0 45.0000000 50.67857 12.6% - 0s 0 0 50.21173 0 120 45.00000 50.21173 11.6% - 0s 0 0 49.82440 0 117 45.00000 49.82440 10.7% - 0s H 0 0 46.0000000 49.82440 8.31% - 0s 0 0 49.38028 0 116 46.00000 49.38028 7.35% - 0s 0 0 49.22661 0 119 46.00000 49.22661 7.01% - 0s 0 0 49.17293 0 121 46.00000 49.17293 6.90% - 0s 0 0 49.07944 0 121 46.00000 49.07944 6.69% - 0s 0 0 48.95533 0 120 46.00000 48.95533 6.42% - 0s 0 0 48.87800 0 122 46.00000 48.87800 6.26% - 0s 0 0 48.83677 0 122 46.00000 48.83677 6.17% - 0s 0 0 48.83677 0 119 46.00000 48.83677 6.17% - 0s 0 2 48.83624 0 119 46.00000 48.83624 6.17% - 0s Cutting planes: Zero half: 103 Explored 38 nodes (2507 simplex iterations) in 0.13 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 4.600000000000e+01, best bound 4.600000000000e+01, gap 0.0%