Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:32:43 2012 Optimize a model with 475 rows, 132 columns and 950 nonzeros Presolve removed 105 rows and 6 columns Presolve time: 0.00s Presolved: 370 rows, 126 columns, 794 nonzeros Variable types: 0 continuous, 126 integer (126 binary) Found heuristic solution: objective 43.0000000 Root relaxation: objective 5.650000e+01, 194 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 56.50000 0 103 43.00000 56.50000 31.4% - 0s H 0 0 44.0000000 56.50000 28.4% - 0s 0 0 55.58333 0 116 44.00000 55.58333 26.3% - 0s 0 0 54.75000 0 109 44.00000 54.75000 24.4% - 0s 0 0 54.18008 0 124 44.00000 54.18008 23.1% - 0s H 0 0 45.0000000 54.18008 20.4% - 0s 0 0 53.61818 0 124 45.00000 53.61818 19.2% - 0s 0 0 53.24554 0 126 45.00000 53.24554 18.3% - 0s 0 0 52.90099 0 126 45.00000 52.90099 17.6% - 0s 0 0 52.68062 0 125 45.00000 52.68062 17.1% - 0s 0 0 52.58995 0 125 45.00000 52.58995 16.9% - 0s 0 0 52.49684 0 126 45.00000 52.49684 16.7% - 0s 0 0 52.42474 0 126 45.00000 52.42474 16.5% - 0s 0 0 52.36545 0 126 45.00000 52.36545 16.4% - 0s 0 0 52.30375 0 126 45.00000 52.30375 16.2% - 0s 0 0 52.25594 0 126 45.00000 52.25594 16.1% - 0s 0 2 52.25312 0 126 45.00000 52.25312 16.1% - 0s H 37 18 47.0000000 52.10471 10.9% 35.5 0s Cutting planes: Zero half: 138 Explored 630 nodes (19445 simplex iterations) in 0.71 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 4.700000000000e+01, best bound 4.700000000000e+01, gap 0.0%