Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:33:28 2012 Optimize a model with 476 rows, 141 columns and 952 nonzeros Presolve removed 81 rows and 0 columns Presolve time: 0.00s Presolved: 395 rows, 141 columns, 843 nonzeros Variable types: 0 continuous, 141 integer (141 binary) Found heuristic solution: objective 49.0000000 Root relaxation: objective 6.025000e+01, 256 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 60.25000 0 122 49.00000 60.25000 23.0% - 0s H 0 0 52.0000000 60.25000 15.9% - 0s 0 0 59.43333 0 138 52.00000 59.43333 14.3% - 0s H 0 0 53.0000000 59.43333 12.1% - 0s 0 0 58.96721 0 135 53.00000 58.96721 11.3% - 0s H 0 0 54.0000000 58.96721 9.20% - 0s H 0 0 55.0000000 58.96721 7.21% - 0s 0 0 58.43235 0 138 55.00000 58.43235 6.24% - 0s 0 0 58.16730 0 138 55.00000 58.16730 5.76% - 0s 0 0 58.00000 0 132 55.00000 58.00000 5.45% - 0s 0 0 57.85393 0 138 55.00000 57.85393 5.19% - 0s 0 0 57.76260 0 138 55.00000 57.76260 5.02% - 0s 0 0 57.70179 0 138 55.00000 57.70179 4.91% - 0s 0 0 57.64847 0 138 55.00000 57.64847 4.82% - 0s 0 0 57.57259 0 140 55.00000 57.57259 4.68% - 0s 0 0 57.39676 0 140 55.00000 57.39676 4.36% - 0s 0 0 57.33089 0 140 55.00000 57.33089 4.24% - 0s 0 0 57.26769 0 139 55.00000 57.26769 4.12% - 0s 0 0 57.22819 0 138 55.00000 57.22819 4.05% - 0s 0 0 57.19120 0 139 55.00000 57.19120 3.98% - 0s 0 0 57.17867 0 138 55.00000 57.17867 3.96% - 0s 0 0 57.17803 0 139 55.00000 57.17803 3.96% - 0s 0 0 57.17803 0 137 55.00000 57.17803 3.96% - 0s 0 2 57.17511 0 136 55.00000 57.17511 3.95% - 0s Cutting planes: Zero half: 50 Explored 26 nodes (1865 simplex iterations) in 0.15 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%