Gurobi 5.0.1 (linux64) logging started Sun Nov 18 05:56:53 2012 Optimize a model with 423 rows, 402 columns and 1457 nonzeros Presolve removed 0 rows and 21 columns Presolve time: 0.00s Presolved: 423 rows, 381 columns, 1436 nonzeros Variable types: 0 continuous, 381 integer (380 binary) Found heuristic solution: objective 75.0000000 Root relaxation: objective 0.000000e+00, 236 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 0.00000 0 167 75.00000 0.00000 100% - 0s H 0 0 58.0000000 0.00000 100% - 0s 0 0 0.42540 0 170 58.00000 0.42540 99.3% - 0s H 0 0 40.0000000 0.42540 98.9% - 0s 0 0 0.94877 0 174 40.00000 0.94877 97.6% - 0s 0 0 0.94889 0 173 40.00000 0.94889 97.6% - 0s H 0 0 39.0000000 0.94889 97.6% - 0s 0 0 0.94889 0 172 39.00000 0.94889 97.6% - 0s 0 2 0.97895 0 172 39.00000 0.97895 97.5% - 0s H 27 18 12.0000000 1.00000 91.7% 39.5 0s Cutting planes: Gomory: 3 Zero half: 6 Mod-K: 1 Explored 179 nodes (8034 simplex iterations) in 0.40 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 1.200000000000e+01, best bound 1.200000000000e+01, gap 0.0%