Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:32:19 2012 Optimize a model with 318 rows, 116 columns and 636 nonzeros Presolve removed 58 rows and 7 columns Presolve time: 0.00s Presolved: 260 rows, 109 columns, 546 nonzeros Variable types: 0 continuous, 109 integer (109 binary) Found heuristic solution: objective 48.0000000 Root relaxation: objective 5.350000e+01, 151 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 53.50000 0 91 48.00000 53.50000 11.5% - 0s 0 0 53.00000 0 90 48.00000 53.00000 10.4% - 0s 0 0 52.20000 0 98 48.00000 52.20000 8.75% - 0s 0 0 51.57143 0 107 48.00000 51.57143 7.44% - 0s H 0 0 49.0000000 51.57143 5.25% - 0s 0 0 51.30000 0 100 49.00000 51.30000 4.69% - 0s 0 0 51.00000 0 106 49.00000 51.00000 4.08% - 0s 0 0 50.96471 0 100 49.00000 50.96471 4.01% - 0s 0 0 50.88462 0 108 49.00000 50.88462 3.85% - 0s 0 0 50.83871 0 108 49.00000 50.83871 3.75% - 0s 0 0 50.76591 0 106 49.00000 50.76591 3.60% - 0s 0 0 50.71014 0 106 49.00000 50.71014 3.49% - 0s 0 0 50.67029 0 106 49.00000 50.67029 3.41% - 0s 0 0 50.60988 0 107 49.00000 50.60988 3.29% - 0s 0 0 50.60000 0 105 49.00000 50.60000 3.27% - 0s 0 0 50.60000 0 106 49.00000 50.60000 3.27% - 0s 0 0 50.60000 0 105 49.00000 50.60000 3.27% - 0s 0 2 50.60000 0 105 49.00000 50.60000 3.27% - 0s Cutting planes: Zero half: 63 Explored 21 nodes (1054 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%