Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:34:10 2012 Optimize a model with 545 rows, 144 columns and 1090 nonzeros Presolve removed 126 rows and 2 columns Presolve time: 0.00s Presolved: 419 rows, 142 columns, 916 nonzeros Variable types: 0 continuous, 142 integer (142 binary) Found heuristic solution: objective 45.0000000 Root relaxation: objective 6.025000e+01, 245 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 60.25000 0 116 45.00000 60.25000 33.9% - 0s H 0 0 47.0000000 60.25000 28.2% - 0s 0 0 58.76923 0 139 47.00000 58.76923 25.0% - 0s H 0 0 50.0000000 58.76923 17.5% - 0s 0 0 57.88818 0 139 50.00000 57.88818 15.8% - 0s 0 0 57.31946 0 140 50.00000 57.31946 14.6% - 0s 0 0 57.03458 0 138 50.00000 57.03458 14.1% - 0s 0 0 56.71224 0 138 50.00000 56.71224 13.4% - 0s 0 0 56.39078 0 139 50.00000 56.39078 12.8% - 0s 0 0 56.20202 0 141 50.00000 56.20202 12.4% - 0s 0 0 55.90415 0 141 50.00000 55.90415 11.8% - 0s 0 0 55.84271 0 139 50.00000 55.84271 11.7% - 0s 0 0 55.69668 0 138 50.00000 55.69668 11.4% - 0s 0 0 55.61509 0 140 50.00000 55.61509 11.2% - 0s 0 0 55.60862 0 138 50.00000 55.60862 11.2% - 0s 0 0 55.55742 0 140 50.00000 55.55742 11.1% - 0s 0 0 55.55742 0 139 50.00000 55.55742 11.1% - 0s 0 2 55.55047 0 139 50.00000 55.55047 11.1% - 0s H 55 18 51.0000000 55.31212 8.46% 33.2 0s * 220 19 7 52.0000000 54.14792 4.13% 33.5 0s Cutting planes: Gomory: 2 Zero half: 129 Explored 265 nodes (10176 simplex iterations) in 0.44 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 5.200000000000e+01, best bound 5.200000000000e+01, gap 0.0%