Gurobi 5.0.1 (linux64) logging started Sun Nov 18 05:26:15 2012 Optimize a model with 257 rows, 277 columns and 917 nonzeros Presolve removed 0 rows and 23 columns Presolve time: 0.00s Presolved: 257 rows, 254 columns, 894 nonzeros Variable types: 0 continuous, 254 integer (253 binary) Found heuristic solution: objective 40.0000000 Root relaxation: objective 0.000000e+00, 183 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 0.00000 0 107 40.00000 0.00000 100% - 0s H 0 0 30.0000000 0.00000 100% - 0s H 0 0 28.0000000 0.00000 100% - 0s 0 0 0.13603 0 109 28.00000 0.13603 100% - 0s H 0 0 20.0000000 0.13603 99.3% - 0s 0 0 0.74470 0 116 20.00000 0.74470 96.3% - 0s H 0 0 19.0000000 0.74470 96.1% - 0s 0 0 0.74470 0 122 19.00000 0.74470 96.1% - 0s 0 0 0.74470 0 122 19.00000 0.74470 96.1% - 0s H 0 0 12.0000000 0.74470 93.8% - 0s 0 2 0.74650 0 119 12.00000 0.74650 93.8% - 0s H 27 17 5.0000000 1.21001 75.8% 17.7 0s * 28 6 15 4.0000000 1.21001 69.7% 17.7 0s Cutting planes: Gomory: 4 Zero half: 1 Explored 53 nodes (1834 simplex iterations) in 0.10 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 4.000000000000e+00, best bound 4.000000000000e+00, gap 0.0%