Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:33:55 2012 Optimize a model with 498 rows, 143 columns and 996 nonzeros Presolve removed 102 rows and 4 columns Presolve time: 0.00s Presolved: 396 rows, 139 columns, 849 nonzeros Variable types: 0 continuous, 139 integer (139 binary) Found heuristic solution: objective 47.0000000 Root relaxation: objective 6.100000e+01, 212 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 61.00000 0 108 47.00000 61.00000 29.8% - 0s H 0 0 48.0000000 61.00000 27.1% - 0s 0 0 60.13158 0 130 48.00000 60.13158 25.3% - 0s H 0 0 51.0000000 60.13158 17.9% - 0s 0 0 59.31034 0 129 51.00000 59.31034 16.3% - 0s 0 0 58.82456 0 138 51.00000 58.82456 15.3% - 0s H 0 0 53.0000000 58.82456 11.0% - 0s H 0 0 54.0000000 58.82456 8.93% - 0s 0 0 58.35759 0 135 54.00000 58.35759 8.07% - 0s 0 0 57.74310 0 136 54.00000 57.74310 6.93% - 0s 0 0 57.49650 0 137 54.00000 57.49650 6.47% - 0s 0 0 57.30300 0 139 54.00000 57.30300 6.12% - 0s 0 0 57.24859 0 138 54.00000 57.24859 6.02% - 0s 0 0 57.10459 0 139 54.00000 57.10459 5.75% - 0s 0 0 57.08180 0 139 54.00000 57.08180 5.71% - 0s 0 0 57.08180 0 138 54.00000 57.08180 5.71% - 0s 0 2 57.07527 0 138 54.00000 57.07527 5.69% - 0s Cutting planes: Zero half: 97 Mod-K: 1 Explored 59 nodes (3374 simplex iterations) in 0.19 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 5.400000000000e+01, best bound 5.400000000000e+01, gap 0.0%