Gurobi 5.0.1 (linux64) logging started Tue Nov 20 05:48:50 2012 Optimize a model with 345 rows, 82 columns and 690 nonzeros Presolve removed 116 rows and 1 columns Presolve time: 0.00s Presolved: 229 rows, 81 columns, 539 nonzeros Variable types: 0 continuous, 81 integer (81 binary) Found heuristic solution: objective 26.0000000 Root relaxation: objective 3.152632e+01, 139 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 31.52632 0 80 26.00000 31.52632 21.3% - 0s H 0 0 28.0000000 31.52632 12.6% - 0s 0 0 30.90909 0 79 28.00000 30.90909 10.4% - 0s 0 0 30.60870 0 79 28.00000 30.60870 9.32% - 0s 0 0 30.56757 0 81 28.00000 30.56757 9.17% - 0s 0 0 30.50000 0 80 28.00000 30.50000 8.93% - 0s 0 0 30.46723 0 81 28.00000 30.46723 8.81% - 0s 0 0 30.27440 0 80 28.00000 30.27440 8.12% - 0s 0 0 30.18065 0 80 28.00000 30.18065 7.79% - 0s 0 0 30.10427 0 80 28.00000 30.10427 7.52% - 0s 0 0 30.06383 0 79 28.00000 30.06383 7.37% - 0s 0 0 29.96933 0 76 28.00000 29.96933 7.03% - 0s 0 0 29.94438 0 78 28.00000 29.94438 6.94% - 0s 0 0 29.89722 0 79 28.00000 29.89722 6.78% - 0s 0 0 29.87272 0 80 28.00000 29.87272 6.69% - 0s 0 0 29.86963 0 80 28.00000 29.86963 6.68% - 0s 0 0 29.86963 0 80 28.00000 29.86963 6.68% - 0s 0 2 29.85464 0 80 28.00000 29.85464 6.62% - 0s Cutting planes: Clique: 1 Zero half: 36 Explored 23 nodes (1022 simplex iterations) in 0.08 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%