Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:33:27 2012 Optimize a model with 525 rows, 141 columns and 1050 nonzeros Presolve removed 117 rows and 0 columns Presolve time: 0.00s Presolved: 408 rows, 141 columns, 895 nonzeros Variable types: 0 continuous, 141 integer (141 binary) Found heuristic solution: objective 47.0000000 Root relaxation: objective 5.950000e+01, 216 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 59.50000 0 103 47.00000 59.50000 26.6% - 0s 0 0 57.88591 0 138 47.00000 57.88591 23.2% - 0s H 0 0 48.0000000 57.88591 20.6% - 0s 0 0 57.12264 0 137 48.00000 57.12264 19.0% - 0s 0 0 56.90169 0 137 48.00000 56.90169 18.5% - 0s 0 0 56.75901 0 139 48.00000 56.75901 18.2% - 0s 0 0 56.46446 0 139 48.00000 56.46446 17.6% - 0s 0 0 56.03346 0 137 48.00000 56.03346 16.7% - 0s 0 0 55.85819 0 138 48.00000 55.85819 16.4% - 0s 0 0 55.70096 0 140 48.00000 55.70096 16.0% - 0s 0 0 55.68222 0 137 48.00000 55.68222 16.0% - 0s 0 0 55.66090 0 140 48.00000 55.66090 16.0% - 0s 0 0 55.66090 0 140 48.00000 55.66090 16.0% - 0s H 0 0 49.0000000 55.66090 13.6% - 0s 0 2 55.65806 0 140 49.00000 55.65806 13.6% - 0s H 16 10 50.0000000 55.65252 11.3% 41.1 0s Cutting planes: Zero half: 118 Explored 870 nodes (21516 simplex iterations) in 0.78 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%