Gurobi 5.0.1 (linux64) logging started Fri Nov 16 03:15:15 2012 Optimize a model with 3520 rows, 1640 columns and 12040 nonzeros Presolve removed 640 rows and 0 columns Presolve time: 0.07s Presolved: 2880 rows, 1640 columns, 10520 nonzeros Variable types: 0 continuous, 1640 integer (1640 binary) Found heuristic solution: objective 24.0000000 Root relaxation: objective 3.000000e+00, 2442 iterations, 0.13 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 3.00000 0 44 24.00000 3.00000 87.5% - 0s H 0 0 4.0000000 3.00000 25.0% - 0s 0 0 3.00000 0 108 4.00000 3.00000 25.0% - 0s 0 0 3.00000 0 72 4.00000 3.00000 25.0% - 0s 0 0 3.00000 0 86 4.00000 3.00000 25.0% - 1s 0 0 3.00000 0 63 4.00000 3.00000 25.0% - 2s 0 0 3.00000 0 67 4.00000 3.00000 25.0% - 2s 0 0 3.00000 0 81 4.00000 3.00000 25.0% - 3s 0 0 3.00000 0 81 4.00000 3.00000 25.0% - 3s 0 2 3.00000 0 81 4.00000 3.00000 25.0% - 4s 4 4 3.00000 1 44 4.00000 3.00000 25.0% 614 5s 13 10 3.00000 15 48 4.00000 3.00000 25.0% 3458 10s Cutting planes: Gomory: 5 Zero half: 14 Explored 16 nodes (86415 simplex iterations) in 10.52 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%