Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:32:11 2012 Optimize a model with 254 rows, 103 columns and 508 nonzeros Presolve removed 52 rows and 9 columns Presolve time: 0.00s Presolved: 202 rows, 94 columns, 421 nonzeros Variable types: 0 continuous, 94 integer (94 binary) Found heuristic solution: objective 41.0000000 Root relaxation: objective 4.750000e+01, 122 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 47.50000 0 81 41.00000 47.50000 15.9% - 0s H 0 0 42.0000000 47.50000 13.1% - 0s 0 0 46.00000 0 90 42.00000 46.00000 9.52% - 0s 0 0 45.66667 0 93 42.00000 45.66667 8.73% - 0s H 0 0 43.0000000 45.66667 6.20% - 0s 0 0 45.18367 0 91 43.00000 45.18367 5.08% - 0s 0 0 45.04878 0 89 43.00000 45.04878 4.76% - 0s 0 0 44.79528 0 93 43.00000 44.79528 4.18% - 0s 0 0 44.35676 0 94 43.00000 44.35676 3.16% - 0s 0 0 44.18182 0 89 43.00000 44.18182 2.75% - 0s 0 0 44.00000 0 88 43.00000 44.00000 2.33% - 0s 0 0 44.00000 0 92 43.00000 44.00000 2.33% - 0s 0 0 44.00000 0 78 43.00000 44.00000 2.33% - 0s 0 2 44.00000 0 78 43.00000 44.00000 2.33% - 0s Explored 3 nodes (691 simplex iterations) in 0.05 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 4.300000000000e+01, best bound 4.300000000000e+01, gap 0.0%