Gurobi 5.0.1 (linux64) logging started Sun Nov 18 03:10:05 2012 Optimize a model with 93 rows, 86 columns and 316 nonzeros Presolve removed 0 rows and 3 columns Presolve time: 0.00s Presolved: 93 rows, 83 columns, 313 nonzeros Variable types: 0 continuous, 83 integer (82 binary) Found heuristic solution: objective 20.0000000 Root relaxation: objective 0.000000e+00, 50 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 36 20.00000 0.00000 100% - 0s H 0 0 13.0000000 0.00000 100% - 0s 0 0 0.44444 0 37 13.00000 0.44444 96.6% - 0s H 0 0 12.0000000 0.44444 96.3% - 0s H 0 0 8.0000000 0.44444 94.4% - 0s 0 0 1.00000 0 38 8.00000 1.00000 87.5% - 0s H 0 0 4.0000000 1.00000 75.0% - 0s 0 0 1.00000 0 36 4.00000 1.00000 75.0% - 0s 0 2 1.00000 0 36 4.00000 1.00000 75.0% - 0s Cutting planes: Gomory: 1 Mod-K: 4 Explored 15 nodes (538 simplex iterations) in 0.02 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%