Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:34:15 2012 Optimize a model with 553 rows, 145 columns and 1106 nonzeros Presolve removed 98 rows and 0 columns Presolve time: 0.00s Presolved: 455 rows, 145 columns, 972 nonzeros Variable types: 0 continuous, 145 integer (145 binary) Found heuristic solution: objective 45.0000000 Root relaxation: objective 6.025000e+01, 208 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 60.25000 0 123 45.00000 60.25000 33.9% - 0s 0 0 58.62500 0 130 45.00000 58.62500 30.3% - 0s 0 0 57.75000 0 121 45.00000 57.75000 28.3% - 0s 0 0 57.32601 0 138 45.00000 57.32601 27.4% - 0s 0 0 56.69565 0 140 45.00000 56.69565 26.0% - 0s H 0 0 47.0000000 56.69565 20.6% - 0s 0 0 56.48991 0 143 47.00000 56.48991 20.2% - 0s 0 0 55.77126 0 143 47.00000 55.77126 18.7% - 0s 0 0 55.68470 0 141 47.00000 55.68470 18.5% - 0s 0 0 55.51950 0 143 47.00000 55.51950 18.1% - 0s 0 0 55.16394 0 141 47.00000 55.16394 17.4% - 0s 0 0 55.05895 0 141 47.00000 55.05895 17.1% - 0s 0 0 55.02878 0 143 47.00000 55.02878 17.1% - 0s 0 0 55.02878 0 143 47.00000 55.02878 17.1% - 0s 0 2 55.02857 0 141 47.00000 55.02857 17.1% - 0s * 14 14 11 49.0000000 55.02857 12.3% 49.6 0s * 91 24 12 50.0000000 54.33817 8.68% 36.8 0s Cutting planes: Gomory: 1 Zero half: 150 Explored 447 nodes (16405 simplex iterations) in 0.64 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 5.000000000000e+01, best bound 5.000000000000e+01, gap 0.0%