Gurobi 5.0.1 (linux64) logging started Tue Nov 20 05:48:50 2012 Optimize a model with 352 rows, 82 columns and 704 nonzeros Presolve removed 113 rows and 0 columns Presolve time: 0.00s Presolved: 239 rows, 82 columns, 566 nonzeros Variable types: 0 continuous, 82 integer (82 binary) Found heuristic solution: objective 23.0000000 Root relaxation: objective 3.125000e+01, 150 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 31.25000 0 61 23.00000 31.25000 35.9% - 0s 0 0 30.77660 0 79 23.00000 30.77660 33.8% - 0s H 0 0 25.0000000 30.77660 23.1% - 0s 0 0 30.16667 0 79 25.00000 30.16667 20.7% - 0s 0 0 29.86250 0 80 25.00000 29.86250 19.5% - 0s 0 0 29.84375 0 81 25.00000 29.84375 19.4% - 0s 0 0 29.75812 0 80 25.00000 29.75812 19.0% - 0s 0 0 29.66808 0 81 25.00000 29.66808 18.7% - 0s 0 0 29.60243 0 82 25.00000 29.60243 18.4% - 0s 0 0 29.52941 0 80 25.00000 29.52941 18.1% - 0s H 0 0 26.0000000 29.52941 13.6% - 0s 0 0 29.42982 0 80 26.00000 29.42982 13.2% - 0s 0 0 29.33911 0 81 26.00000 29.33911 12.8% - 0s H 0 0 27.0000000 29.33911 8.66% - 0s 0 0 29.31433 0 81 27.00000 29.31433 8.57% - 0s 0 0 29.29821 0 81 27.00000 29.29821 8.51% - 0s 0 0 29.29821 0 81 27.00000 29.29821 8.51% - 0s 0 2 29.29398 0 81 27.00000 29.29398 8.50% - 0s * 7 3 5 28.0000000 29.28571 4.59% 35.4 0s Cutting planes: Zero half: 30 Explored 11 nodes (862 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%