Gurobi 5.0.1 (linux64) logging started Tue Nov 20 05:49:08 2012 Optimize a model with 449 rows, 96 columns and 898 nonzeros Presolve removed 147 rows and 0 columns Presolve time: 0.00s Presolved: 302 rows, 96 columns, 720 nonzeros Variable types: 0 continuous, 96 integer (96 binary) Found heuristic solution: objective 27.0000000 Root relaxation: objective 3.573333e+01, 223 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 35.73333 0 92 27.00000 35.73333 32.3% - 0s H 0 0 28.0000000 35.73333 27.6% - 0s 0 0 34.86784 0 95 28.00000 34.86784 24.5% - 0s 0 0 34.66129 0 95 28.00000 34.66129 23.8% - 0s H 0 0 29.0000000 34.66129 19.5% - 0s 0 0 34.46812 0 96 29.00000 34.46812 18.9% - 0s 0 0 34.40444 0 93 29.00000 34.40444 18.6% - 0s 0 0 34.32318 0 95 29.00000 34.32318 18.4% - 0s 0 0 34.28932 0 95 29.00000 34.28932 18.2% - 0s H 0 0 31.0000000 34.28932 10.6% - 0s 0 0 34.24960 0 94 31.00000 34.24960 10.5% - 0s 0 0 34.15242 0 95 31.00000 34.15242 10.2% - 0s 0 0 34.02972 0 96 31.00000 34.02972 9.77% - 0s 0 0 33.97896 0 96 31.00000 33.97896 9.61% - 0s 0 0 33.97040 0 96 31.00000 33.97040 9.58% - 0s 0 0 33.97040 0 95 31.00000 33.97040 9.58% - 0s 0 2 33.97037 0 95 31.00000 33.97037 9.58% - 0s Cutting planes: Clique: 2 Zero half: 47 Explored 37 nodes (2005 simplex iterations) in 0.13 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 3.100000000000e+01, best bound 3.100000000000e+01, gap 0.0%