Gurobi 5.0.1 (linux64) logging started Tue Nov 20 05:48:52 2012 Optimize a model with 331 rows, 84 columns and 662 nonzeros Presolve removed 94 rows and 0 columns Presolve time: 0.00s Presolved: 237 rows, 84 columns, 538 nonzeros Variable types: 0 continuous, 84 integer (84 binary) Found heuristic solution: objective 26.0000000 Root relaxation: objective 3.257143e+01, 138 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 32.57143 0 79 26.00000 32.57143 25.3% - 0s 0 0 31.88095 0 80 26.00000 31.88095 22.6% - 0s 0 0 31.50000 0 81 26.00000 31.50000 21.2% - 0s 0 0 31.00000 0 80 26.00000 31.00000 19.2% - 0s 0 0 31.00000 0 79 26.00000 31.00000 19.2% - 0s 0 0 30.67797 0 80 26.00000 30.67797 18.0% - 0s 0 0 30.58333 0 84 26.00000 30.58333 17.6% - 0s H 0 0 27.0000000 30.58333 13.3% - 0s 0 0 30.53910 0 84 27.00000 30.53910 13.1% - 0s 0 0 30.46250 0 80 27.00000 30.46250 12.8% - 0s H 0 0 28.0000000 30.46250 8.79% - 0s 0 0 30.44286 0 84 28.00000 30.44286 8.72% - 0s 0 0 30.44286 0 83 28.00000 30.44286 8.72% - 0s 0 2 30.43455 0 83 28.00000 30.43455 8.69% - 0s Cutting planes: Clique: 1 Zero half: 42 Explored 49 nodes (1407 simplex iterations) in 0.07 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%