Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:43:12 2012 Optimize a model with 678 rows, 160 columns and 1356 nonzeros Presolve removed 159 rows and 0 columns Presolve time: 0.00s Presolved: 519 rows, 160 columns, 1149 nonzeros Variable types: 0 continuous, 160 integer (160 binary) Found heuristic solution: objective 43.0000000 Root relaxation: objective 6.300000e+01, 271 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 63.00000 0 118 43.00000 63.00000 46.5% - 0s H 0 0 46.0000000 63.00000 37.0% - 0s 0 0 62.16667 0 155 46.00000 62.16667 35.1% - 0s H 0 0 48.0000000 62.16667 29.5% - 0s 0 0 61.46154 0 155 48.00000 61.46154 28.0% - 0s H 0 0 49.0000000 61.46154 25.4% - 0s 0 0 60.94009 0 157 49.00000 60.94009 24.4% - 0s 0 0 60.28571 0 151 49.00000 60.28571 23.0% - 0s 0 0 60.03584 0 157 49.00000 60.03584 22.5% - 0s 0 0 59.88154 0 159 49.00000 59.88154 22.2% - 0s 0 0 59.67957 0 157 49.00000 59.67957 21.8% - 0s 0 0 59.46500 0 155 49.00000 59.46500 21.4% - 0s 0 0 59.36903 0 152 49.00000 59.36903 21.2% - 0s 0 0 59.29251 0 158 49.00000 59.29251 21.0% - 0s 0 0 59.14475 0 157 49.00000 59.14475 20.7% - 0s 0 0 59.14320 0 157 49.00000 59.14320 20.7% - 0s 0 0 59.14320 0 157 49.00000 59.14320 20.7% - 0s 0 2 59.14189 0 157 49.00000 59.14189 20.7% - 0s H 66 46 50.0000000 58.82846 17.7% 44.5 0s * 132 74 19 51.0000000 58.23453 14.2% 40.1 0s * 467 166 13 52.0000000 57.10937 9.83% 39.6 0s 614 211 54.71429 16 156 52.00000 56.75180 9.14% 38.1 5s 628 220 54.06667 14 157 52.00000 56.75180 9.14% 37.3 10s 2112 415 53.00000 24 110 52.00000 55.03704 5.84% 40.7 15s Cutting planes: Gomory: 1 Zero half: 235 Explored 4058 nodes (141776 simplex iterations) in 18.72 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%