Gurobi 5.0.1 (linux64) logging started Fri Nov 16 03:17:24 2012 Optimize a model with 4039 rows, 1640 columns and 13558 nonzeros Presolve removed 1122 rows and 2 columns Presolve time: 0.10s Presolved: 2957 rows, 1638 columns, 12372 nonzeros Variable types: 0 continuous, 1638 integer (1638 binary) Found heuristic solution: objective 40.0000000 Root relaxation: objective 3.000000e+00, 2912 iterations, 0.26 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 3.00000 0 685 40.00000 3.00000 92.5% - 1s H 0 0 37.0000000 3.00000 91.9% - 1s H 0 0 6.0000000 3.00000 50.0% - 1s H 0 0 5.0000000 3.00000 40.0% - 1s 0 0 3.00000 0 101 5.00000 3.00000 40.0% - 1s H 0 0 4.0000000 3.00000 25.0% - 1s 0 0 3.00000 0 68 4.00000 3.00000 25.0% - 1s 0 0 3.00000 0 94 4.00000 3.00000 25.0% - 1s 0 0 3.00000 0 91 4.00000 3.00000 25.0% - 2s 0 0 3.00000 0 66 4.00000 3.00000 25.0% - 3s 0 0 3.00000 0 79 4.00000 3.00000 25.0% - 4s 0 0 3.00000 0 94 4.00000 3.00000 25.0% - 5s 0 0 3.00000 0 89 4.00000 3.00000 25.0% - 6s 0 0 3.00000 0 98 4.00000 3.00000 25.0% - 6s 0 0 3.00000 0 96 4.00000 3.00000 25.0% - 7s 0 0 3.00000 0 92 4.00000 3.00000 25.0% - 7s 0 0 3.00000 0 87 4.00000 3.00000 25.0% - 8s 0 0 3.00000 0 74 4.00000 3.00000 25.0% - 8s 0 0 3.00000 0 99 4.00000 3.00000 25.0% - 9s 0 0 3.00000 0 99 4.00000 3.00000 25.0% - 9s 0 2 3.00000 0 99 4.00000 3.00000 25.0% - 10s 7 6 3.00000 1 95 4.00000 3.00000 25.0% 69.9 15s 11 9 3.00000 1 68 4.00000 3.00000 25.0% 44.5 20s Cutting planes: Gomory: 30 Clique: 1 Zero half: 81 Explored 19 nodes (124966 simplex iterations) in 24.21 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 4.000000000000e+00, best bound 4.000000000000e+00, gap 0.0%