Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:32:27 2012 Optimize a model with 389 rows, 123 columns and 778 nonzeros Presolve removed 76 rows and 5 columns Presolve time: 0.00s Presolved: 313 rows, 118 columns, 657 nonzeros Variable types: 0 continuous, 118 integer (118 binary) Found heuristic solution: objective 44.0000000 Root relaxation: objective 5.400000e+01, 191 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 54.00000 0 96 44.00000 54.00000 22.7% - 0s 0 0 52.54545 0 112 44.00000 52.54545 19.4% - 0s H 0 0 48.0000000 52.54545 9.47% - 0s 0 0 52.25000 0 115 48.00000 52.25000 8.85% - 0s 0 0 51.73611 0 114 48.00000 51.73611 7.78% - 0s H 0 0 49.0000000 51.73611 5.58% - 0s 0 0 51.58995 0 116 49.00000 51.58995 5.29% - 0s 0 0 51.38559 0 112 49.00000 51.38559 4.87% - 0s 0 0 51.20952 0 117 49.00000 51.20952 4.51% - 0s 0 0 51.12696 0 116 49.00000 51.12696 4.34% - 0s 0 0 50.99329 0 117 49.00000 50.99329 4.07% - 0s 0 0 50.95894 0 118 49.00000 50.95894 4.00% - 0s 0 0 50.95894 0 118 49.00000 50.95894 4.00% - 0s 0 2 50.95860 0 118 49.00000 50.95860 4.00% - 0s Cutting planes: Gomory: 2 Zero half: 54 Explored 23 nodes (1274 simplex iterations) in 0.08 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%