Gurobi 5.0.1 (linux64) logging started Tue Dec 25 15:24:01 2012 Optimize a model with 442 rows, 441 columns and 1980 nonzeros Presolve removed 169 rows and 98 columns Presolve time: 0.01s Presolved: 273 rows, 343 columns, 3051 nonzeros Variable types: 20 continuous, 323 integer (323 binary) Root relaxation: objective 2.582569e+02, 99 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 258.25685 0 32 - 258.25685 - - 0s 0 0 272.78158 0 37 - 272.78158 - - 0s 0 0 273.50000 0 19 - 273.50000 - - 0s 0 0 273.61163 0 38 - 273.61163 - - 0s 0 0 273.65996 0 40 - 273.65996 - - 0s 0 0 273.65996 0 40 - 273.65996 - - 0s 0 0 273.65996 0 33 - 273.65996 - - 0s H 0 0 351.0000000 273.65996 22.0% - 0s H 0 0 313.0000000 273.65996 12.6% - 0s 0 2 273.87773 0 33 313.00000 273.87773 12.5% - 0s * 68 25 8 303.0000000 279.89953 7.62% 7.9 0s Cutting planes: Gomory: 4 Cover: 1 Implied bound: 2 Clique: 1 MIR: 2 Zero half: 3 Explored 4405 nodes (26088 simplex iterations) in 1.22 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 3.030000000000e+02, best bound 3.030000000000e+02, gap 0.0%