Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:32:41 2012 Optimize a model with 405 rows, 131 columns and 810 nonzeros Presolve removed 56 rows and 0 columns Presolve time: 0.00s Presolved: 349 rows, 131 columns, 733 nonzeros Variable types: 0 continuous, 131 integer (131 binary) Found heuristic solution: objective 45.0000000 Root relaxation: objective 5.900000e+01, 170 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 59.00000 0 114 45.00000 59.00000 31.1% - 0s 0 0 56.75000 0 117 45.00000 56.75000 26.1% - 0s 0 0 56.04545 0 126 45.00000 56.04545 24.5% - 0s 0 0 55.01471 0 129 45.00000 55.01471 22.3% - 0s H 0 0 47.0000000 55.01471 17.1% - 0s 0 0 54.28594 0 130 47.00000 54.28594 15.5% - 0s 0 0 54.03536 0 131 47.00000 54.03536 15.0% - 0s 0 0 53.66292 0 128 47.00000 53.66292 14.2% - 0s 0 0 53.66292 0 129 47.00000 53.66292 14.2% - 0s 0 0 53.66292 0 128 47.00000 53.66292 14.2% - 0s H 0 0 49.0000000 53.66292 9.52% - 0s 0 2 53.66292 0 126 49.00000 53.66292 9.52% - 0s * 37 17 6 50.0000000 53.28436 6.57% 29.2 0s Cutting planes: Gomory: 1 Zero half: 87 Explored 162 nodes (5737 simplex iterations) in 0.20 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%