Gurobi 5.0.1 (linux64) logging started Tue Nov 20 05:49:51 2012 Optimize a model with 537 rows, 106 columns and 1074 nonzeros Presolve removed 177 rows and 0 columns Presolve time: 0.00s Presolved: 360 rows, 106 columns, 870 nonzeros Variable types: 0 continuous, 106 integer (106 binary) Found heuristic solution: objective 26.0000000 Root relaxation: objective 3.844444e+01, 263 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 38.44444 0 98 26.00000 38.44444 47.9% - 0s H 0 0 28.0000000 38.44444 37.3% - 0s 0 0 37.97264 0 102 28.00000 37.97264 35.6% - 0s H 0 0 29.0000000 37.97264 30.9% - 0s 0 0 37.40993 0 97 29.00000 37.40993 29.0% - 0s 0 0 36.87097 0 101 29.00000 36.87097 27.1% - 0s 0 0 36.78864 0 100 29.00000 36.78864 26.9% - 0s 0 0 36.71000 0 101 29.00000 36.71000 26.6% - 0s 0 0 36.67917 0 104 29.00000 36.67917 26.5% - 0s H 0 0 30.0000000 36.67917 22.3% - 0s 0 0 36.66940 0 103 30.00000 36.66940 22.2% - 0s 0 0 36.65023 0 103 30.00000 36.65023 22.2% - 0s 0 0 36.63763 0 104 30.00000 36.63763 22.1% - 0s 0 0 36.63763 0 104 30.00000 36.63763 22.1% - 0s 0 2 36.63720 0 103 30.00000 36.63720 22.1% - 0s * 17 11 12 31.0000000 36.62852 18.2% 28.3 0s * 62 19 10 32.0000000 36.09916 12.8% 30.8 0s Cutting planes: Clique: 3 Zero half: 54 Explored 339 nodes (9060 simplex iterations) in 0.32 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 3.200000000000e+01, best bound 3.200000000000e+01, gap 0.0%