Gurobi 5.0.1 (linux64) logging started Sun Nov 18 07:15:20 2012 Optimize a model with 559 rows, 506 columns and 1901 nonzeros Presolve removed 0 rows and 13 columns Presolve time: 0.00s Presolved: 559 rows, 493 columns, 1888 nonzeros Variable types: 0 continuous, 493 integer (492 binary) Found heuristic solution: objective 91.0000000 Root relaxation: objective 0.000000e+00, 316 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 0 201 91.00000 0.00000 100% - 0s H 0 0 69.0000000 0.00000 100% - 0s H 0 0 67.0000000 0.00000 100% - 0s 0 0 0.47612 0 202 67.00000 0.47612 99.3% - 0s H 0 0 50.0000000 0.47612 99.0% - 0s 0 0 1.00000 0 203 50.00000 1.00000 98.0% - 0s H 0 0 43.0000000 1.00000 97.7% - 0s 0 0 1.00000 0 201 43.00000 1.00000 97.7% - 0s 0 2 1.00000 0 201 43.00000 1.00000 97.7% - 0s H 54 46 23.0000000 3.78695 83.5% 40.3 0s * 80 56 15 22.0000000 3.79302 82.8% 40.7 0s H 198 122 21.0000000 7.07711 66.3% 36.9 0s * 306 112 14 20.0000000 7.74805 61.3% 34.4 0s 3075 426 17.10563 28 179 20.00000 13.00000 35.0% 29.7 5s Explored 5921 nodes (167387 simplex iterations) in 8.72 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 2.000000000000e+01, best bound 2.000000000000e+01, gap 0.0%