Gurobi 5.0.1 (linux64) logging started Tue Nov 20 05:48:50 2012 Optimize a model with 337 rows, 81 columns and 674 nonzeros Presolve removed 121 rows and 2 columns Presolve time: 0.00s Presolved: 216 rows, 79 columns, 522 nonzeros Variable types: 0 continuous, 79 integer (79 binary) Found heuristic solution: objective 25.0000000 Root relaxation: objective 3.125000e+01, 159 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 31.25000 0 65 25.00000 31.25000 25.0% - 0s 0 0 30.68182 0 76 25.00000 30.68182 22.7% - 0s 0 0 30.14815 0 77 25.00000 30.14815 20.6% - 0s 0 0 29.93071 0 78 25.00000 29.93071 19.7% - 0s 0 0 29.67039 0 77 25.00000 29.67039 18.7% - 0s 0 0 29.43088 0 78 25.00000 29.43088 17.7% - 0s 0 0 29.31769 0 77 25.00000 29.31769 17.3% - 0s 0 0 29.26823 0 76 25.00000 29.26823 17.1% - 0s 0 0 29.25758 0 77 25.00000 29.25758 17.0% - 0s 0 0 29.25758 0 76 25.00000 29.25758 17.0% - 0s H 0 0 27.0000000 29.25758 8.36% - 0s 0 2 29.25758 0 76 27.00000 29.25758 8.36% - 0s Cutting planes: Gomory: 1 Clique: 2 Zero half: 40 Explored 25 nodes (1220 simplex iterations) in 0.07 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 2.700000000000e+01, best bound 2.700000000000e+01, gap 0.0%