Gurobi 5.0.1 (linux64) logging started Tue Nov 20 05:48:47 2012 Optimize a model with 271 rows, 77 columns and 542 nonzeros Presolve removed 66 rows and 0 columns Presolve time: 0.00s Presolved: 205 rows, 77 columns, 458 nonzeros Variable types: 0 continuous, 77 integer (77 binary) Found heuristic solution: objective 28.0000000 Root relaxation: objective 3.155556e+01, 150 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 31.55556 0 74 28.00000 31.55556 12.7% - 0s 0 0 30.58824 0 73 28.00000 30.58824 9.24% - 0s 0 0 30.33333 0 66 28.00000 30.33333 8.33% - 0s 0 0 30.27273 0 75 28.00000 30.27273 8.12% - 0s 0 0 30.21348 0 76 28.00000 30.21348 7.91% - 0s 0 0 30.00000 0 59 28.00000 30.00000 7.14% - 0s 0 0 29.96154 0 72 28.00000 29.96154 7.01% - 0s 0 0 29.82222 0 75 28.00000 29.82222 6.51% - 0s 0 0 29.82192 0 72 28.00000 29.82192 6.51% - 0s 0 0 29.76316 0 71 28.00000 29.76316 6.30% - 0s 0 0 29.70803 0 70 28.00000 29.70803 6.10% - 0s 0 0 29.64789 0 76 28.00000 29.64789 5.89% - 0s 0 0 29.61538 0 75 28.00000 29.61538 5.77% - 0s 0 0 29.60000 0 69 28.00000 29.60000 5.71% - 0s 0 0 29.55000 0 75 28.00000 29.55000 5.54% - 0s 0 0 29.54545 0 76 28.00000 29.54545 5.52% - 0s 0 0 29.54545 0 68 28.00000 29.54545 5.52% - 0s 0 2 29.54545 0 67 28.00000 29.54545 5.52% - 0s Cutting planes: Gomory: 1 Zero half: 41 Explored 25 nodes (985 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%