Gurobi 5.0.1 (linux64) logging started Tue Nov 20 05:48:46 2012 Optimize a model with 269 rows, 76 columns and 538 nonzeros Presolve removed 79 rows and 2 columns Presolve time: 0.00s Presolved: 190 rows, 74 columns, 435 nonzeros Variable types: 0 continuous, 74 integer (74 binary) Found heuristic solution: objective 24.0000000 Root relaxation: objective 3.083333e+01, 121 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 30.83333 0 69 24.00000 30.83333 28.5% - 0s H 0 0 26.0000000 30.83333 18.6% - 0s 0 0 30.00000 0 67 26.00000 30.00000 15.4% - 0s 0 0 30.00000 0 63 26.00000 30.00000 15.4% - 0s H 0 0 27.0000000 30.00000 11.1% - 0s 0 0 30.00000 0 67 27.00000 30.00000 11.1% - 0s 0 0 30.00000 0 61 27.00000 30.00000 11.1% - 0s H 0 0 28.0000000 30.00000 7.14% - 0s 0 0 29.88889 0 66 28.00000 29.88889 6.75% - 0s 0 0 29.87500 0 67 28.00000 29.87500 6.70% - 0s 0 0 29.85000 0 65 28.00000 29.85000 6.61% - 0s 0 0 29.79000 0 74 28.00000 29.79000 6.39% - 0s 0 0 29.71795 0 72 28.00000 29.71795 6.14% - 0s 0 0 29.62791 0 72 28.00000 29.62791 5.81% - 0s 0 0 29.56522 0 72 28.00000 29.56522 5.59% - 0s 0 0 29.53333 0 72 28.00000 29.53333 5.48% - 0s 0 0 29.51456 0 72 28.00000 29.51456 5.41% - 0s 0 0 29.51402 0 72 28.00000 29.51402 5.41% - 0s 0 0 29.51402 0 72 28.00000 29.51402 5.41% - 0s 0 2 29.50993 0 72 28.00000 29.50993 5.39% - 0s Cutting planes: Gomory: 1 Clique: 1 Zero half: 26 Explored 7 nodes (713 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%