Gurobi 5.0.1 (linux64) logging started Tue Nov 20 05:50:44 2012 Optimize a model with 599 rows, 111 columns and 1198 nonzeros Presolve removed 199 rows and 0 columns Presolve time: 0.00s Presolved: 400 rows, 111 columns, 970 nonzeros Variable types: 0 continuous, 111 integer (111 binary) Found heuristic solution: objective 27.0000000 Root relaxation: objective 3.974330e+01, 260 iterations, 0.01 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 39.74330 0 108 27.00000 39.74330 47.2% - 0s H 0 0 29.0000000 39.74330 37.0% - 0s H 0 0 30.0000000 39.74330 32.5% - 0s 0 0 39.26069 0 106 30.00000 39.26069 30.9% - 0s 0 0 38.97457 0 108 30.00000 38.97457 29.9% - 0s 0 0 38.81176 0 110 30.00000 38.81176 29.4% - 0s H 0 0 31.0000000 38.81176 25.2% - 0s 0 0 38.44889 0 109 31.00000 38.44889 24.0% - 0s 0 0 38.27977 0 110 31.00000 38.27977 23.5% - 0s 0 0 38.07993 0 109 31.00000 38.07993 22.8% - 0s 0 0 37.94191 0 108 31.00000 37.94191 22.4% - 0s H 0 0 32.0000000 37.94191 18.6% - 0s 0 0 37.88791 0 110 32.00000 37.88791 18.4% - 0s 0 0 37.86035 0 109 32.00000 37.86035 18.3% - 0s 0 0 37.84712 0 109 32.00000 37.84712 18.3% - 0s 0 0 37.84712 0 109 32.00000 37.84712 18.3% - 0s H 0 0 33.0000000 37.84712 14.7% - 0s 0 2 37.84495 0 109 33.00000 37.84495 14.7% - 0s Cutting planes: Clique: 3 Zero half: 59 Explored 370 nodes (11556 simplex iterations) in 0.46 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 3.300000000000e+01, best bound 3.300000000000e+01, gap 0.0%