Gurobi 5.0.1 (linux64) logging started Fri Nov 16 03:10:16 2012 Optimize a model with 2556 rows, 1332 columns and 8856 nonzeros Presolve removed 721 rows and 36 columns Presolve time: 0.04s Presolved: 1835 rows, 1296 columns, 7092 nonzeros Variable types: 0 continuous, 1296 integer (1296 binary) Found heuristic solution: objective 18.0000000 Root relaxation: objective 3.000000e+00, 2101 iterations, 0.10 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 3.00000 0 45 18.00000 3.00000 83.3% - 0s H 0 0 4.0000000 3.00000 25.0% - 0s 0 0 3.00000 0 42 4.00000 3.00000 25.0% - 0s 0 0 3.00000 0 30 4.00000 3.00000 25.0% - 0s 0 0 3.00000 0 113 4.00000 3.00000 25.0% - 0s 0 0 3.00000 0 26 4.00000 3.00000 25.0% - 0s 0 0 3.00000 0 71 4.00000 3.00000 25.0% - 0s 0 0 3.00000 0 92 4.00000 3.00000 25.0% - 1s 0 0 3.00000 0 26 4.00000 3.00000 25.0% - 1s 0 2 3.00000 0 26 4.00000 3.00000 25.0% - 1s 17 13 3.00000 11 36 4.00000 3.00000 25.0% 1899 5s Cutting planes: Gomory: 1 Clique: 1 Zero half: 2 Explored 22 nodes (48939 simplex iterations) in 5.07 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%