Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:34:52 2012 Optimize a model with 538 rows, 147 columns and 1076 nonzeros Presolve removed 105 rows and 2 columns Presolve time: 0.00s Presolved: 433 rows, 145 columns, 933 nonzeros Variable types: 0 continuous, 145 integer (145 binary) Found heuristic solution: objective 47.0000000 Root relaxation: objective 6.100000e+01, 228 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 61.00000 0 122 47.00000 61.00000 29.8% - 0s 0 0 60.16667 0 140 47.00000 60.16667 28.0% - 0s H 0 0 49.0000000 60.16667 22.8% - 0s 0 0 59.33333 0 136 49.00000 59.33333 21.1% - 0s 0 0 58.94937 0 139 49.00000 58.94937 20.3% - 0s H 0 0 50.0000000 58.94937 17.9% - 0s 0 0 58.45884 0 137 50.00000 58.45884 16.9% - 0s H 0 0 51.0000000 58.45884 14.6% - 0s 0 0 57.88000 0 142 51.00000 57.88000 13.5% - 0s 0 0 57.55424 0 143 51.00000 57.55424 12.9% - 0s 0 0 57.46740 0 144 51.00000 57.46740 12.7% - 0s 0 0 57.33589 0 143 51.00000 57.33589 12.4% - 0s 0 0 57.21203 0 143 51.00000 57.21203 12.2% - 0s 0 0 57.08889 0 142 51.00000 57.08889 11.9% - 0s 0 0 57.04125 0 142 51.00000 57.04125 11.8% - 0s 0 0 56.98415 0 142 51.00000 56.98415 11.7% - 0s 0 0 56.96854 0 143 51.00000 56.96854 11.7% - 0s 0 0 56.96854 0 143 51.00000 56.96854 11.7% - 0s H 0 0 52.0000000 56.96854 9.55% - 0s 0 2 56.96562 0 143 52.00000 56.96562 9.55% - 0s * 42 14 9 53.0000000 56.85029 7.26% 35.2 0s Cutting planes: Zero half: 124 Explored 172 nodes (7302 simplex iterations) in 0.34 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%