Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:40:21 2012 Optimize a model with 601 rows, 157 columns and 1202 nonzeros Presolve removed 119 rows and 0 columns Presolve time: 0.00s Presolved: 482 rows, 157 columns, 1047 nonzeros Variable types: 0 continuous, 157 integer (157 binary) Found heuristic solution: objective 50.0000000 Root relaxation: objective 6.500000e+01, 240 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 65.00000 0 124 50.00000 65.00000 30.0% - 0s 0 0 63.40000 0 146 50.00000 63.40000 26.8% - 0s 0 0 62.77027 0 148 50.00000 62.77027 25.5% - 0s 0 0 62.21429 0 151 50.00000 62.21429 24.4% - 0s 0 0 61.42857 0 153 50.00000 61.42857 22.9% - 0s H 0 0 51.0000000 61.42857 20.4% - 0s 0 0 60.70734 0 153 51.00000 60.70734 19.0% - 0s 0 0 60.47886 0 153 51.00000 60.47886 18.6% - 0s 0 0 60.30030 0 156 51.00000 60.30030 18.2% - 0s 0 0 60.19749 0 156 51.00000 60.19749 18.0% - 0s 0 0 60.14405 0 154 51.00000 60.14405 17.9% - 0s 0 0 60.08090 0 155 51.00000 60.08090 17.8% - 0s 0 0 60.04535 0 156 51.00000 60.04535 17.7% - 0s 0 0 60.04535 0 156 51.00000 60.04535 17.7% - 0s H 0 0 52.0000000 60.04535 15.5% - 0s H 0 0 54.0000000 60.04535 11.2% - 0s 0 2 60.04410 0 156 54.00000 60.04410 11.2% - 0s * 100 27 10 55.0000000 59.27420 7.77% 46.5 0s Cutting planes: Gomory: 1 Zero half: 136 Explored 603 nodes (22306 simplex iterations) in 0.91 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 5.500000000000e+01, best bound 5.500000000000e+01, gap 0.0%