Gurobi 5.0.1 (linux64) logging started Fri Nov 16 03:20:14 2012 Optimize a model with 4032 rows, 1806 columns and 13734 nonzeros Presolve removed 672 rows and 0 columns Presolve time: 0.08s Presolved: 3360 rows, 1806 columns, 12180 nonzeros Variable types: 0 continuous, 1806 integer (1806 binary) Found heuristic solution: objective 25.0000000 Root relaxation: objective 3.000000e+00, 3429 iterations, 0.23 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 3.00000 0 50 25.00000 3.00000 88.0% - 0s H 0 0 4.0000000 3.00000 25.0% - 0s 0 0 3.00000 0 233 4.00000 3.00000 25.0% - 0s 0 0 3.00000 0 82 4.00000 3.00000 25.0% - 1s 0 0 3.00000 0 81 4.00000 3.00000 25.0% - 1s 0 0 3.00000 0 52 4.00000 3.00000 25.0% - 2s 0 0 3.00000 0 66 4.00000 3.00000 25.0% - 2s 0 0 3.00000 0 78 4.00000 3.00000 25.0% - 3s 0 0 3.00000 0 76 4.00000 3.00000 25.0% - 3s 0 0 3.00000 0 80 4.00000 3.00000 25.0% - 4s 0 0 3.00000 0 46 4.00000 3.00000 25.0% - 4s 0 0 3.00000 0 80 4.00000 3.00000 25.0% - 5s 0 0 3.00000 0 80 4.00000 3.00000 25.0% - 5s 0 2 3.00000 0 80 4.00000 3.00000 25.0% - 5s 9 8 3.00000 1 50 4.00000 3.00000 25.0% 173 10s 15 11 3.00000 17 209 4.00000 3.00000 25.0% 3562 15s Cutting planes: Gomory: 1 Zero half: 5 Explored 19 nodes (114650 simplex iterations) in 17.00 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%