Gurobi 5.0.1 (linux64) logging started Tue Nov 20 05:50:59 2012 Optimize a model with 611 rows, 112 columns and 1222 nonzeros Presolve removed 217 rows and 0 columns Presolve time: 0.00s Presolved: 394 rows, 112 columns, 969 nonzeros Variable types: 0 continuous, 112 integer (112 binary) Found heuristic solution: objective 29.0000000 Root relaxation: objective 3.996215e+01, 249 iterations, 0.01 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 39.96215 0 110 29.00000 39.96215 37.8% - 0s H 0 0 30.0000000 39.96215 33.2% - 0s 0 0 39.48375 0 109 30.00000 39.48375 31.6% - 0s 0 0 39.26129 0 112 30.00000 39.26129 30.9% - 0s H 0 0 32.0000000 39.26129 22.7% - 0s 0 0 39.08000 0 111 32.00000 39.08000 22.1% - 0s 0 0 38.91536 0 111 32.00000 38.91536 21.6% - 0s 0 0 38.63066 0 111 32.00000 38.63066 20.7% - 0s 0 0 38.27394 0 107 32.00000 38.27394 19.6% - 0s 0 0 38.17196 0 108 32.00000 38.17196 19.3% - 0s 0 0 38.06498 0 112 32.00000 38.06498 19.0% - 0s 0 0 37.98017 0 111 32.00000 37.98017 18.7% - 0s 0 0 37.92500 0 112 32.00000 37.92500 18.5% - 0s 0 0 37.89337 0 112 32.00000 37.89337 18.4% - 0s 0 0 37.89013 0 112 32.00000 37.89013 18.4% - 0s 0 2 37.88856 0 112 32.00000 37.88856 18.4% - 0s Cutting planes: Clique: 2 Zero half: 69 Explored 637 nodes (18900 simplex iterations) in 0.76 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%