Gurobi 5.0.1 (linux64) logging started Tue Nov 20 05:48:54 2012 Optimize a model with 349 rows, 86 columns and 698 nonzeros Presolve removed 105 rows and 0 columns Presolve time: 0.00s Presolved: 244 rows, 86 columns, 572 nonzeros Variable types: 0 continuous, 86 integer (86 binary) Found heuristic solution: objective 25.0000000 Root relaxation: objective 3.333333e+01, 153 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 33.33333 0 83 25.00000 33.33333 33.3% - 0s 0 0 32.56250 0 83 25.00000 32.56250 30.2% - 0s H 0 0 26.0000000 32.56250 25.2% - 0s 0 0 32.38019 0 84 26.00000 32.38019 24.5% - 0s H 0 0 27.0000000 32.38019 19.9% - 0s 0 0 32.28236 0 85 27.00000 32.28236 19.6% - 0s H 0 0 28.0000000 32.28236 15.3% - 0s 0 0 32.11869 0 84 28.00000 32.11869 14.7% - 0s 0 0 31.95370 0 83 28.00000 31.95370 14.1% - 0s 0 0 31.86337 0 86 28.00000 31.86337 13.8% - 0s 0 0 31.79458 0 86 28.00000 31.79458 13.6% - 0s 0 0 31.69233 0 86 28.00000 31.69233 13.2% - 0s 0 0 31.63195 0 86 28.00000 31.63195 13.0% - 0s 0 0 31.58752 0 86 28.00000 31.58752 12.8% - 0s 0 0 31.57051 0 86 28.00000 31.57051 12.8% - 0s 0 0 31.57051 0 86 28.00000 31.57051 12.8% - 0s 0 2 31.57051 0 86 28.00000 31.57051 12.8% - 0s Cutting planes: Gomory: 2 Zero half: 48 Explored 92 nodes (2673 simplex iterations) in 0.12 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%