Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:33:22 2012 Optimize a model with 520 rows, 140 columns and 1040 nonzeros Presolve removed 104 rows and 0 columns Presolve time: 0.00s Presolved: 416 rows, 140 columns, 906 nonzeros Variable types: 0 continuous, 140 integer (140 binary) Found heuristic solution: objective 46.0000000 Root relaxation: objective 5.800000e+01, 246 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 58.00000 0 117 46.00000 58.00000 26.1% - 0s 0 0 57.17391 0 138 46.00000 57.17391 24.3% - 0s 0 0 56.44545 0 136 46.00000 56.44545 22.7% - 0s H 0 0 47.0000000 56.44545 20.1% - 0s 0 0 56.20000 0 138 47.00000 56.20000 19.6% - 0s 0 0 55.80461 0 138 47.00000 55.80461 18.7% - 0s 0 0 55.61280 0 138 47.00000 55.61280 18.3% - 0s 0 0 55.52810 0 136 47.00000 55.52810 18.1% - 0s 0 0 55.22911 0 139 47.00000 55.22911 17.5% - 0s 0 0 55.10290 0 137 47.00000 55.10290 17.2% - 0s 0 0 54.90117 0 139 47.00000 54.90117 16.8% - 0s 0 0 54.88524 0 139 47.00000 54.88524 16.8% - 0s 0 0 54.88524 0 139 47.00000 54.88524 16.8% - 0s H 0 0 48.0000000 54.88524 14.3% - 0s H 0 0 49.0000000 54.88524 12.0% - 0s 0 2 54.88524 0 139 49.00000 54.88524 12.0% - 0s H 53 22 50.0000000 54.53431 9.07% 40.4 0s Cutting planes: Gomory: 1 Zero half: 111 Explored 506 nodes (16315 simplex iterations) in 0.60 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 5.000000000000e+01, best bound 5.000000000000e+01, gap 0.0%