Gurobi 5.0.1 (linux64) logging started Sun Nov 18 06:15:42 2012 Optimize a model with 505 rows, 463 columns and 1723 nonzeros Presolve removed 0 rows and 21 columns Presolve time: 0.00s Presolved: 505 rows, 442 columns, 1702 nonzeros Variable types: 0 continuous, 442 integer (441 binary) Found heuristic solution: objective 87.0000000 Root relaxation: objective 0.000000e+00, 281 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 0 181 87.00000 0.00000 100% - 0s H 0 0 84.0000000 0.00000 100% - 0s H 0 0 83.0000000 0.00000 100% - 0s H 0 0 67.0000000 0.00000 100% - 0s H 0 0 63.0000000 0.00000 100% - 0s 0 0 0.26235 0 183 63.00000 0.26235 100% - 0s H 0 0 62.0000000 0.26235 100% - 0s 0 0 0.91482 0 185 62.00000 0.91482 98.5% - 0s H 0 0 61.0000000 0.91482 98.5% - 0s 0 0 0.91506 0 187 61.00000 0.91506 98.5% - 0s 0 0 0.91506 0 187 61.00000 0.91506 98.5% - 0s H 0 0 59.0000000 0.91506 98.4% - 0s 0 2 0.92953 0 187 59.00000 0.92953 98.4% - 0s H 27 27 34.0000000 1.00000 97.1% 47.1 0s * 39 37 23 22.0000000 1.00000 95.5% 39.2 0s * 65 40 18 21.0000000 1.00000 95.2% 39.8 0s * 248 142 13 20.0000000 1.25551 93.7% 37.8 0s * 650 224 38 19.0000000 7.00000 63.2% 37.3 1s Explored 3384 nodes (87989 simplex iterations) in 4.94 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 1.900000000000e+01, best bound 1.900000000000e+01, gap 0.0%