Gurobi 5.0.1 (linux64) logging started Sun Nov 18 06:44:52 2012 Optimize a model with 539 rows, 490 columns and 1835 nonzeros Presolve removed 0 rows and 14 columns Presolve time: 0.00s Presolved: 539 rows, 476 columns, 1821 nonzeros Variable types: 0 continuous, 476 integer (475 binary) Found heuristic solution: objective 100.0000000 Root relaxation: objective 0.000000e+00, 300 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 0 202 100.00000 0.00000 100% - 0s H 0 0 78.0000000 0.00000 100% - 0s H 0 0 73.0000000 0.00000 100% - 0s 0 0 0.44275 0 204 73.00000 0.44275 99.4% - 0s H 0 0 61.0000000 0.44275 99.3% - 0s 0 0 0.66667 0 204 61.00000 0.66667 98.9% - 0s H 0 0 45.0000000 0.66667 98.5% - 0s 0 0 0.66667 0 206 45.00000 0.66667 98.5% - 0s 0 0 0.66667 0 206 45.00000 0.66667 98.5% - 0s 0 0 0.66667 0 204 45.00000 0.66667 98.5% - 0s 0 2 0.66667 0 204 45.00000 0.66667 98.5% - 0s H 54 54 43.0000000 1.94175 95.5% 28.4 0s * 64 44 41 22.0000000 1.94175 91.2% 27.8 0s * 106 67 26 21.0000000 2.16471 89.7% 28.0 0s * 182 86 25 20.0000000 4.00000 80.0% 28.8 0s H 219 99 19.0000000 6.91011 63.6% 29.0 0s * 261 89 25 18.0000000 7.16168 60.2% 30.2 0s Cutting planes: Gomory: 1 Explored 861 nodes (30135 simplex iterations) in 1.33 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 1.800000000000e+01, best bound 1.800000000000e+01, gap 0.0%