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 105 rows and 0 columns Presolve time: 0.00s Presolved: 415 rows, 140 columns, 897 nonzeros Variable types: 0 continuous, 140 integer (140 binary) Found heuristic solution: objective 44.0000000 Root relaxation: objective 5.800000e+01, 261 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 0 114 44.00000 58.00000 31.8% - 0s 0 0 56.75758 0 138 44.00000 56.75758 29.0% - 0s H 0 0 45.0000000 56.75758 26.1% - 0s 0 0 56.00000 0 136 45.00000 56.00000 24.4% - 0s H 0 0 46.0000000 56.00000 21.7% - 0s 0 0 55.75000 0 128 46.00000 55.75000 21.2% - 0s 0 0 55.68421 0 137 46.00000 55.68421 21.1% - 0s 0 0 55.31294 0 140 46.00000 55.31294 20.2% - 0s 0 0 54.87321 0 140 46.00000 54.87321 19.3% - 0s H 0 0 47.0000000 54.87321 16.8% - 0s 0 0 54.77877 0 140 47.00000 54.77877 16.6% - 0s H 0 0 48.0000000 54.77877 14.1% - 0s 0 0 54.74463 0 140 48.00000 54.74463 14.1% - 0s 0 0 54.74463 0 140 48.00000 54.74463 14.1% - 0s 0 2 54.73921 0 140 48.00000 54.73921 14.0% - 0s H 5 5 49.0000000 54.71441 11.7% 71.4 0s * 420 62 17 50.0000000 52.30000 4.60% 29.0 0s Cutting planes: Gomory: 1 Zero half: 120 Explored 575 nodes (16889 simplex iterations) in 0.63 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%