Gurobi 5.0.1 (linux64) logging started Tue Nov 20 05:49:30 2012 Optimize a model with 508 rows, 103 columns and 1016 nonzeros Presolve removed 163 rows and 0 columns Presolve time: 0.00s Presolved: 345 rows, 103 columns, 828 nonzeros Variable types: 0 continuous, 103 integer (103 binary) Found heuristic solution: objective 25.0000000 Root relaxation: objective 3.854687e+01, 229 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 38.54687 0 99 25.00000 38.54687 54.2% - 0s H 0 0 31.0000000 38.54687 24.3% - 0s 0 0 37.97468 0 101 31.00000 37.97468 22.5% - 0s 0 0 37.43927 0 99 31.00000 37.43927 20.8% - 0s 0 0 36.99643 0 101 31.00000 36.99643 19.3% - 0s 0 0 36.82021 0 103 31.00000 36.82021 18.8% - 0s 0 0 36.78059 0 100 31.00000 36.78059 18.6% - 0s 0 0 36.65909 0 103 31.00000 36.65909 18.3% - 0s 0 0 36.52592 0 103 31.00000 36.52592 17.8% - 0s 0 0 36.45077 0 102 31.00000 36.45077 17.6% - 0s 0 0 36.42970 0 101 31.00000 36.42970 17.5% - 0s 0 0 36.36919 0 102 31.00000 36.36919 17.3% - 0s H 0 0 32.0000000 36.36919 13.7% - 0s 0 0 36.32428 0 102 32.00000 36.32428 13.5% - 0s 0 0 36.25180 0 103 32.00000 36.25180 13.3% - 0s 0 0 36.18768 0 101 32.00000 36.18768 13.1% - 0s 0 0 36.16605 0 101 32.00000 36.16605 13.0% - 0s 0 0 36.16605 0 100 32.00000 36.16605 13.0% - 0s 0 2 36.16519 0 100 32.00000 36.16519 13.0% - 0s Cutting planes: Clique: 2 Zero half: 54 Explored 163 nodes (5108 simplex iterations) in 0.25 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 3.200000000000e+01, best bound 3.200000000000e+01, gap 0.0%