Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:51:34 2012 Optimize a model with 675 rows, 165 columns and 1350 nonzeros Presolve removed 140 rows and 2 columns Presolve time: 0.00s Presolved: 535 rows, 163 columns, 1156 nonzeros Variable types: 0 continuous, 163 integer (163 binary) Found heuristic solution: objective 48.0000000 Root relaxation: objective 6.700000e+01, 258 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 67.00000 0 122 48.00000 67.00000 39.6% - 0s H 0 0 49.0000000 67.00000 36.7% - 0s 0 0 66.27652 0 159 49.00000 66.27652 35.3% - 0s H 0 0 52.0000000 66.27652 27.5% - 0s 0 0 65.66667 0 157 52.00000 65.66667 26.3% - 0s 0 0 64.72319 0 160 52.00000 64.72319 24.5% - 0s 0 0 63.93907 0 161 52.00000 63.93907 23.0% - 0s 0 0 63.45759 0 160 52.00000 63.45759 22.0% - 0s H 0 0 53.0000000 63.45759 19.7% - 0s 0 0 63.35363 0 162 53.00000 63.35363 19.5% - 0s 0 0 63.25350 0 162 53.00000 63.25350 19.3% - 0s 0 0 63.16268 0 161 53.00000 63.16268 19.2% - 0s 0 0 63.02406 0 159 53.00000 63.02406 18.9% - 0s 0 0 62.97770 0 160 53.00000 62.97770 18.8% - 0s 0 0 62.94243 0 159 53.00000 62.94243 18.8% - 0s 0 0 62.93895 0 160 53.00000 62.93895 18.8% - 0s 0 0 62.93895 0 158 53.00000 62.93895 18.8% - 0s 0 2 62.92571 0 157 53.00000 62.92571 18.7% - 0s H 16 16 54.0000000 62.90838 16.5% 51.5 0s H 138 61 56.0000000 61.69343 10.2% 45.3 0s 611 179 58.40000 10 160 56.00000 60.34651 7.76% 39.7 5s 2867 261 57.43182 30 120 56.00000 58.47368 4.42% 33.3 10s Cutting planes: Gomory: 4 Zero half: 74 Explored 3681 nodes (115192 simplex iterations) in 10.91 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 5.600000000000e+01, best bound 5.600000000000e+01, gap 0.0%