Gurobi 5.0.1 (linux64) logging started Sun Nov 18 03:12:53 2012 Optimize a model with 215 rows, 164 columns and 699 nonzeros Presolve removed 0 rows and 3 columns Presolve time: 0.00s Presolved: 215 rows, 161 columns, 696 nonzeros Variable types: 0 continuous, 161 integer (160 binary) Found heuristic solution: objective 53.0000000 Root relaxation: objective 0.000000e+00, 84 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 53 53.00000 0.00000 100% - 0s H 0 0 41.0000000 0.00000 100% - 0s H 0 0 38.0000000 0.00000 100% - 0s H 0 0 36.0000000 0.00000 100% - 0s 0 0 0.49221 0 54 36.00000 0.49221 98.6% - 0s 0 0 1.00000 0 56 36.00000 1.00000 97.2% - 0s H 0 0 35.0000000 1.00000 97.1% - 0s 0 0 1.09539 0 56 35.00000 1.09539 96.9% - 0s H 0 0 30.0000000 1.09539 96.3% - 0s 0 0 1.09722 0 57 30.00000 1.09722 96.3% - 0s 0 0 1.09722 0 57 30.00000 1.09722 96.3% - 0s H 0 0 28.0000000 1.09722 96.1% - 0s 0 2 1.09850 0 57 28.00000 1.09850 96.1% - 0s * 27 25 16 25.0000000 2.47787 90.1% 25.0 0s * 53 40 16 24.0000000 2.49584 89.6% 26.8 0s * 175 111 17 23.0000000 6.47826 71.8% 25.4 0s * 190 111 15 22.0000000 7.25898 67.0% 24.3 0s * 193 106 13 21.0000000 7.25898 65.4% 23.9 0s * 197 99 13 20.0000000 7.25898 63.7% 23.8 0s Cutting planes: Gomory: 4 Mod-K: 1 Explored 1063 nodes (20105 simplex iterations) in 0.52 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 2.000000000000e+01, best bound 2.000000000000e+01, gap 0.0%