Gurobi 5.0.1 (linux64) logging started Tue Nov 20 05:48:50 2012 Optimize a model with 337 rows, 81 columns and 674 nonzeros Presolve removed 115 rows and 0 columns Presolve time: 0.00s Presolved: 222 rows, 81 columns, 539 nonzeros Variable types: 0 continuous, 81 integer (81 binary) Found heuristic solution: objective 23.0000000 Root relaxation: objective 3.033333e+01, 134 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 30.33333 0 69 23.00000 30.33333 31.9% - 0s H 0 0 24.0000000 30.33333 26.4% - 0s 0 0 29.82308 0 77 24.00000 29.82308 24.3% - 0s H 0 0 25.0000000 29.82308 19.3% - 0s 0 0 29.66667 0 77 25.00000 29.66667 18.7% - 0s H 0 0 26.0000000 29.66667 14.1% - 0s 0 0 29.37931 0 78 26.00000 29.37931 13.0% - 0s 0 0 29.03158 0 81 26.00000 29.03158 11.7% - 0s 0 0 28.85561 0 79 26.00000 28.85561 11.0% - 0s 0 0 28.75758 0 79 26.00000 28.75758 10.6% - 0s 0 0 28.69806 0 79 26.00000 28.69806 10.4% - 0s 0 0 28.65566 0 80 26.00000 28.65566 10.2% - 0s 0 0 28.62642 0 81 26.00000 28.62642 10.1% - 0s 0 0 28.60751 0 80 26.00000 28.60751 10.0% - 0s 0 0 28.59714 0 80 26.00000 28.59714 10.0% - 0s 0 0 28.59714 0 79 26.00000 28.59714 10.0% - 0s 0 2 28.59579 0 79 26.00000 28.59579 10.0% - 0s * 26 4 7 27.0000000 28.06897 3.96% 22.7 0s Cutting planes: Zero half: 33 Explored 31 nodes (1211 simplex iterations) in 0.08 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 2.700000000000e+01, best bound 2.700000000000e+01, gap 0.0%