Gurobi 5.0.1 (linux64) logging started Fri Jan 18 07:07:38 2013 Optimize a model with 4028 rows, 4044 columns and 16082 nonzeros Presolve removed 2022 rows and 2022 columns Presolve time: 0.19s Presolved: 2006 rows, 2022 columns, 6044 nonzeros Variable types: 1022 continuous, 1000 integer (1000 binary) Root relaxation: objective 4.810927e+03, 811 iterations, 0.03 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 4810.92679 0 2 - 4810.92679 - - 0s 0 0 4828.99488 0 2 - 4828.99488 - - 0s H 0 0 4831.1212106 4828.99488 0.04% - 0s 0 0 4831.11879 0 4 4831.12121 4831.11879 0.00% - 0s Cutting planes: Gomory: 1 Implied bound: 2 Flow cover: 4 Explored 0 nodes (1163 simplex iterations) in 0.30 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 4.831121210611e+03, best bound 4.831118786203e+03, gap 0.0001%