Gurobi 5.0.1 (linux64) logging started Tue Nov 20 05:48:50 2012 Optimize a model with 299 rows, 81 columns and 598 nonzeros Presolve removed 104 rows and 2 columns Presolve time: 0.00s Presolved: 195 rows, 79 columns, 459 nonzeros Variable types: 0 continuous, 79 integer (79 binary) Found heuristic solution: objective 24.0000000 Root relaxation: objective 3.100000e+01, 127 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 31.00000 0 68 24.00000 31.00000 29.2% - 0s H 0 0 25.0000000 31.00000 24.0% - 0s 0 0 30.71429 0 72 25.00000 30.71429 22.9% - 0s 0 0 30.45614 0 73 25.00000 30.45614 21.8% - 0s H 0 0 27.0000000 30.45614 12.8% - 0s 0 0 30.22727 0 72 27.00000 30.22727 12.0% - 0s 0 0 30.11111 0 71 27.00000 30.11111 11.5% - 0s 0 0 29.94146 0 77 27.00000 29.94146 10.9% - 0s 0 0 29.81818 0 75 27.00000 29.81818 10.4% - 0s 0 0 29.80000 0 75 27.00000 29.80000 10.4% - 0s 0 0 29.75000 0 75 27.00000 29.75000 10.2% - 0s 0 0 29.74096 0 74 27.00000 29.74096 10.2% - 0s 0 0 29.69547 0 74 27.00000 29.69547 10.0% - 0s 0 0 29.68490 0 76 27.00000 29.68490 9.94% - 0s 0 0 29.68490 0 76 27.00000 29.68490 9.94% - 0s 0 2 29.67577 0 76 27.00000 29.67577 9.91% - 0s * 12 3 8 28.0000000 29.67577 5.98% 15.1 0s Cutting planes: Zero half: 27 Explored 28 nodes (885 simplex iterations) in 0.06 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%