Gurobi 5.0.1 (linux64) logging started Tue Nov 20 05:49:00 2012 Optimize a model with 416 rows, 91 columns and 832 nonzeros Presolve removed 142 rows and 0 columns Presolve time: 0.00s Presolved: 274 rows, 91 columns, 658 nonzeros Variable types: 0 continuous, 91 integer (91 binary) Found heuristic solution: objective 22.0000000 Root relaxation: objective 3.363478e+01, 191 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 33.63478 0 89 22.00000 33.63478 52.9% - 0s H 0 0 25.0000000 33.63478 34.5% - 0s H 0 0 27.0000000 33.63478 24.6% - 0s 0 0 33.23414 0 90 27.00000 33.23414 23.1% - 0s 0 0 33.12934 0 90 27.00000 33.12934 22.7% - 0s 0 0 32.97351 0 91 27.00000 32.97351 22.1% - 0s 0 0 32.75956 0 90 27.00000 32.75956 21.3% - 0s 0 0 32.59012 0 89 27.00000 32.59012 20.7% - 0s 0 0 32.50055 0 91 27.00000 32.50055 20.4% - 0s 0 0 32.42113 0 90 27.00000 32.42113 20.1% - 0s 0 0 32.34672 0 91 27.00000 32.34672 19.8% - 0s 0 0 32.30680 0 91 27.00000 32.30680 19.7% - 0s 0 0 32.20313 0 90 27.00000 32.20313 19.3% - 0s 0 0 32.19623 0 91 27.00000 32.19623 19.2% - 0s 0 0 32.19623 0 91 27.00000 32.19623 19.2% - 0s 0 2 32.19062 0 91 27.00000 32.19062 19.2% - 0s * 32 13 7 28.0000000 31.93814 14.1% 24.4 0s Cutting planes: Clique: 2 Zero half: 48 Explored 177 nodes (4736 simplex iterations) in 0.20 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%