Gurobi 5.0.1 (linux64) logging started Tue Nov 20 13:32:00 2012 Optimize a model with 829 rows, 180 columns and 1658 nonzeros Presolve removed 194 rows and 0 columns Presolve time: 0.01s Presolved: 635 rows, 180 columns, 1406 nonzeros Variable types: 0 continuous, 180 integer (180 binary) Found heuristic solution: objective 51.0000000 Root relaxation: objective 7.200000e+01, 377 iterations, 0.01 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 72.00000 0 153 51.00000 72.00000 41.2% - 0s 0 0 71.08824 0 173 51.00000 71.08824 39.4% - 0s 0 0 69.82054 0 177 51.00000 69.82054 36.9% - 0s 0 0 68.84944 0 176 51.00000 68.84944 35.0% - 0s 0 0 68.44459 0 179 51.00000 68.44459 34.2% - 0s H 0 0 54.0000000 68.44459 26.7% - 0s 0 0 68.12702 0 179 54.00000 68.12702 26.2% - 0s 0 0 67.95666 0 177 54.00000 67.95666 25.8% - 0s 0 0 67.77900 0 178 54.00000 67.77900 25.5% - 0s H 0 0 55.0000000 67.77900 23.2% - 0s 0 0 67.64659 0 179 55.00000 67.64659 23.0% - 0s 0 0 67.57154 0 178 55.00000 67.57154 22.9% - 0s H 0 0 57.0000000 67.57154 18.5% - 0s 0 0 67.47872 0 179 57.00000 67.47872 18.4% - 0s 0 0 67.37847 0 179 57.00000 67.37847 18.2% - 0s 0 0 67.33164 0 180 57.00000 67.33164 18.1% - 0s 0 0 67.33164 0 178 57.00000 67.33164 18.1% - 0s 0 2 67.33083 0 178 57.00000 67.33083 18.1% - 0s 709 361 59.41667 21 118 57.00000 64.46034 13.1% 58.1 5s H 1208 429 58.0000000 64.05108 10.4% 50.7 5s H 1702 448 59.0000000 63.44128 7.53% 46.4 6s 3203 571 60.80000 17 122 59.00000 61.85000 4.83% 40.4 10s Cutting planes: Gomory: 6 Zero half: 71 Explored 4503 nodes (165518 simplex iterations) in 11.58 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 5.900000000000e+01, best bound 5.900000000000e+01, gap 0.0%