Gurobi 5.0.1 (linux64) logging started Tue Nov 20 05:49:00 2012 Optimize a model with 433 rows, 91 columns and 866 nonzeros Presolve removed 164 rows and 0 columns Presolve time: 0.00s Presolved: 269 rows, 91 columns, 671 nonzeros Variable types: 0 continuous, 91 integer (91 binary) Found heuristic solution: objective 25.0000000 Root relaxation: objective 3.238049e+01, 184 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 32.38049 0 89 25.00000 32.38049 29.5% - 0s 0 0 32.00995 0 88 25.00000 32.00995 28.0% - 0s 0 0 31.73452 0 88 25.00000 31.73452 26.9% - 0s H 0 0 27.0000000 31.73452 17.5% - 0s 0 0 31.55165 0 88 27.00000 31.55165 16.9% - 0s 0 0 31.46928 0 89 27.00000 31.46928 16.6% - 0s 0 0 31.42505 0 90 27.00000 31.42505 16.4% - 0s 0 0 31.33633 0 87 27.00000 31.33633 16.1% - 0s 0 0 31.30740 0 89 27.00000 31.30740 16.0% - 0s 0 0 31.28009 0 87 27.00000 31.28009 15.9% - 0s 0 0 31.23487 0 88 27.00000 31.23487 15.7% - 0s 0 0 31.11217 0 89 27.00000 31.11217 15.2% - 0s 0 0 31.08832 0 89 27.00000 31.08832 15.1% - 0s 0 0 31.00185 0 88 27.00000 31.00185 14.8% - 0s 0 0 30.95461 0 88 27.00000 30.95461 14.6% - 0s 0 0 30.84066 0 89 27.00000 30.84066 14.2% - 0s H 0 0 28.0000000 30.84066 10.1% - 0s 0 0 30.77161 0 88 28.00000 30.77161 9.90% - 0s 0 0 30.75071 0 87 28.00000 30.75071 9.82% - 0s 0 0 30.74309 0 89 28.00000 30.74309 9.80% - 0s 0 0 30.74309 0 88 28.00000 30.74309 9.80% - 0s 0 2 30.74054 0 88 28.00000 30.74054 9.79% - 0s Cutting planes: Zero half: 46 Mod-K: 2 Explored 45 nodes (2211 simplex iterations) in 0.15 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 2.800000000000e+01, best bound 2.800000000000e+01, gap 0.0%