Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:33:10 2012 Optimize a model with 459 rows, 137 columns and 918 nonzeros Presolve removed 78 rows and 0 columns Presolve time: 0.00s Presolved: 381 rows, 137 columns, 810 nonzeros Variable types: 0 continuous, 137 integer (137 binary) Found heuristic solution: objective 45.0000000 Root relaxation: objective 5.900000e+01, 206 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 H 0 0 47.0000000 59.00000 25.5% - 0s 0 0 57.83333 0 125 47.00000 57.83333 23.0% - 0s 0 0 57.14583 0 135 47.00000 57.14583 21.6% - 0s H 0 0 49.0000000 57.14583 16.6% - 0s 0 0 56.45000 0 134 49.00000 56.45000 15.2% - 0s 0 0 56.20417 0 137 49.00000 56.20417 14.7% - 0s 0 0 55.63634 0 136 49.00000 55.63634 13.5% - 0s 0 0 55.49217 0 136 49.00000 55.49217 13.2% - 0s 0 0 55.37648 0 136 49.00000 55.37648 13.0% - 0s 0 0 55.15760 0 135 49.00000 55.15760 12.6% - 0s 0 0 55.05499 0 137 49.00000 55.05499 12.4% - 0s H 0 0 51.0000000 55.05499 7.95% - 0s H 0 0 52.0000000 55.05499 5.87% - 0s 0 0 54.91836 0 137 52.00000 54.91836 5.61% - 0s 0 0 54.75204 0 135 52.00000 54.75204 5.29% - 0s 0 0 54.67040 0 136 52.00000 54.67040 5.14% - 0s 0 0 54.66174 0 137 52.00000 54.66174 5.12% - 0s 0 0 54.66174 0 137 52.00000 54.66174 5.12% - 0s 0 2 54.66024 0 137 52.00000 54.66024 5.12% - 0s Cutting planes: Zero half: 84 Explored 38 nodes (2558 simplex iterations) in 0.16 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 5.200000000000e+01, best bound 5.200000000000e+01, gap 0.0%