Gurobi 5.0.1 (linux64) logging started Sat Dec 8 03:30:28 2012 Optimize a model with 555 rows, 540 columns and 1770 nonzeros Presolve removed 63 rows and 36 columns Presolve time: 0.01s Presolved: 492 rows, 504 columns, 1626 nonzeros Variable types: 333 continuous, 171 integer (171 binary) Root relaxation: objective 4.562260e+04, 234 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 45622.5951 0 71 - 45622.5951 - - 0s H 0 0 67875.000000 45622.5951 32.8% - 0s 0 0 54842.8088 0 16 67875.0000 54842.8088 19.2% - 0s 0 0 55124.5069 0 12 67875.0000 55124.5069 18.8% - 0s 0 0 55162.2500 0 1 67875.0000 55162.2500 18.7% - 0s H 0 0 55531.000000 55162.2500 0.66% - 0s H 0 0 55264.000000 55162.2500 0.18% - 0s 0 2 55162.4464 0 1 55264.0000 55162.4464 0.18% - 0s * 39 0 3 55177.000000 55177.0000 0.0% 2.5 0s Cutting planes: Gomory: 10 Cover: 1 Implied bound: 1 Flow cover: 43 Flow path: 32 Explored 40 nodes (441 simplex iterations) in 0.05 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 5.517700000000e+04, best bound 5.517700000000e+04, gap 0.0%