Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:35:38 2012 Optimize a model with 604 rows, 150 columns and 1208 nonzeros Presolve removed 152 rows and 2 columns Presolve time: 0.00s Presolved: 452 rows, 148 columns, 1002 nonzeros Variable types: 0 continuous, 148 integer (148 binary) Found heuristic solution: objective 46.0000000 Root relaxation: objective 6.150000e+01, 237 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 61.50000 0 113 46.00000 61.50000 33.7% - 0s 0 0 60.20930 0 140 46.00000 60.20930 30.9% - 0s H 0 0 47.0000000 60.20930 28.1% - 0s 0 0 59.37059 0 144 47.00000 59.37059 26.3% - 0s 0 0 58.86111 0 143 47.00000 58.86111 25.2% - 0s 0 0 58.47526 0 144 47.00000 58.47526 24.4% - 0s 0 0 58.25964 0 145 47.00000 58.25964 24.0% - 0s 0 0 58.07604 0 145 47.00000 58.07604 23.6% - 0s H 0 0 48.0000000 58.07604 21.0% - 0s 0 0 57.83877 0 144 48.00000 57.83877 20.5% - 0s 0 0 57.75279 0 138 48.00000 57.75279 20.3% - 0s H 0 0 51.0000000 57.75279 13.2% - 0s 0 0 57.59820 0 144 51.00000 57.59820 12.9% - 0s 0 0 57.45259 0 142 51.00000 57.45259 12.7% - 0s 0 0 57.33620 0 143 51.00000 57.33620 12.4% - 0s 0 0 57.24099 0 143 51.00000 57.24099 12.2% - 0s 0 0 57.16119 0 144 51.00000 57.16119 12.1% - 0s 0 0 57.11975 0 144 51.00000 57.11975 12.0% - 0s 0 0 57.11975 0 142 51.00000 57.11975 12.0% - 0s 0 2 57.11975 0 140 51.00000 57.11975 12.0% - 0s * 123 43 20 52.0000000 55.91331 7.53% 38.4 0s Cutting planes: Zero half: 154 Explored 480 nodes (17718 simplex iterations) in 0.73 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%