Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:36:43 2012 Optimize a model with 568 rows, 151 columns and 1136 nonzeros Presolve removed 106 rows and 2 columns Presolve time: 0.00s Presolved: 462 rows, 149 columns, 983 nonzeros Variable types: 0 continuous, 149 integer (149 binary) Found heuristic solution: objective 47.0000000 Root relaxation: objective 6.400000e+01, 280 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 64.00000 0 122 47.00000 64.00000 36.2% - 0s 0 0 62.56250 0 145 47.00000 62.56250 33.1% - 0s 0 0 61.83333 0 141 47.00000 61.83333 31.6% - 0s H 0 0 48.0000000 61.83333 28.8% - 0s 0 0 61.40000 0 143 48.00000 61.40000 27.9% - 0s 0 0 60.62187 0 147 48.00000 60.62187 26.3% - 0s 0 0 59.79046 0 145 48.00000 59.79046 24.6% - 0s 0 0 59.69547 0 146 48.00000 59.69547 24.4% - 0s 0 0 59.53587 0 146 48.00000 59.53587 24.0% - 0s 0 0 59.39838 0 148 48.00000 59.39838 23.7% - 0s 0 0 59.28636 0 147 48.00000 59.28636 23.5% - 0s 0 0 59.19205 0 147 48.00000 59.19205 23.3% - 0s 0 0 59.16968 0 147 48.00000 59.16968 23.3% - 0s 0 0 59.16968 0 147 48.00000 59.16968 23.3% - 0s H 0 0 52.0000000 59.16968 13.8% - 0s 0 2 59.16775 0 147 52.00000 59.16775 13.8% - 0s * 570 124 9 53.0000000 56.52830 6.66% 34.8 0s 714 149 54.68421 10 146 53.00000 56.18985 6.02% 33.7 5s Cutting planes: Gomory: 3 Zero half: 70 Explored 1987 nodes (60959 simplex iterations) in 6.93 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 5.300000000000e+01, best bound 5.300000000000e+01, gap 0.0%