Gurobi 5.0.1 (linux64) logging started Tue Nov 20 05:48:55 2012 Optimize a model with 368 rows, 87 columns and 736 nonzeros Presolve removed 114 rows and 0 columns Presolve time: 0.00s Presolved: 254 rows, 87 columns, 597 nonzeros Variable types: 0 continuous, 87 integer (87 binary) Found heuristic solution: objective 24.0000000 Root relaxation: objective 3.350000e+01, 136 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 33.50000 0 59 24.00000 33.50000 39.6% - 0s H 0 0 25.0000000 33.50000 34.0% - 0s H 0 0 26.0000000 33.50000 28.8% - 0s 0 0 32.50000 0 77 26.00000 32.50000 25.0% - 0s 0 0 32.15625 0 77 26.00000 32.15625 23.7% - 0s 0 0 32.00000 0 79 26.00000 32.00000 23.1% - 0s 0 0 32.00000 0 75 26.00000 32.00000 23.1% - 0s 0 0 31.89474 0 84 26.00000 31.89474 22.7% - 0s 0 0 31.67172 0 79 26.00000 31.67172 21.8% - 0s H 0 0 27.0000000 31.67172 17.3% - 0s 0 0 31.57968 0 84 27.00000 31.57968 17.0% - 0s 0 0 31.45623 0 86 27.00000 31.45623 16.5% - 0s 0 0 31.37745 0 86 27.00000 31.37745 16.2% - 0s 0 0 31.36652 0 85 27.00000 31.36652 16.2% - 0s 0 0 31.31962 0 84 27.00000 31.31962 16.0% - 0s H 0 0 28.0000000 31.31962 11.9% - 0s 0 0 31.31223 0 85 28.00000 31.31223 11.8% - 0s 0 0 31.31223 0 84 28.00000 31.31223 11.8% - 0s 0 2 31.31062 0 84 28.00000 31.31062 11.8% - 0s Cutting planes: Gomory: 1 Clique: 2 Zero half: 67 Explored 123 nodes (3089 simplex iterations) in 0.12 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%