Gurobi 5.0.1 (linux64) logging started Tue Nov 20 05:49:30 2012 Optimize a model with 518 rows, 103 columns and 1036 nonzeros Presolve removed 193 rows and 0 columns Presolve time: 0.00s Presolved: 325 rows, 103 columns, 811 nonzeros Variable types: 0 continuous, 103 integer (103 binary) Found heuristic solution: objective 28.0000000 Root relaxation: objective 3.719703e+01, 221 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 37.19703 0 100 28.00000 37.19703 32.8% - 0s 0 0 36.69161 0 101 28.00000 36.69161 31.0% - 0s 0 0 36.52662 0 101 28.00000 36.52662 30.5% - 0s 0 0 36.26495 0 101 28.00000 36.26495 29.5% - 0s H 0 0 29.0000000 36.26495 25.1% - 0s 0 0 36.12114 0 100 29.00000 36.12114 24.6% - 0s 0 0 36.07012 0 101 29.00000 36.07012 24.4% - 0s 0 0 36.01670 0 101 29.00000 36.01670 24.2% - 0s 0 0 35.96969 0 101 29.00000 35.96969 24.0% - 0s 0 0 35.91982 0 100 29.00000 35.91982 23.9% - 0s 0 0 35.82405 0 100 29.00000 35.82405 23.5% - 0s 0 0 35.80967 0 102 29.00000 35.80967 23.5% - 0s 0 0 35.80967 0 102 29.00000 35.80967 23.5% - 0s 0 2 35.80867 0 102 29.00000 35.80867 23.5% - 0s H 6 6 31.0000000 35.80867 15.5% 47.5 0s Cutting planes: Clique: 1 Zero half: 48 Mod-K: 2 Explored 236 nodes (6198 simplex iterations) in 0.27 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 3.100000000000e+01, best bound 3.100000000000e+01, gap 0.0%