Gurobi 5.0.1 (linux64) logging started Sun Nov 18 04:19:53 2012 Optimize a model with 369 rows, 273 columns and 1193 nonzeros Presolve removed 0 rows and 2 columns Presolve time: 0.00s Presolved: 369 rows, 271 columns, 1191 nonzeros Variable types: 0 continuous, 271 integer (270 binary) Found heuristic solution: objective 79.0000000 Root relaxation: objective 0.000000e+00, 129 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 86 79.00000 0.00000 100% - 0s H 0 0 60.0000000 0.00000 100% - 0s 0 0 0.66744 0 87 60.00000 0.66744 98.9% - 0s H 0 0 56.0000000 0.66744 98.8% - 0s 0 0 1.18734 0 89 56.00000 1.18734 97.9% - 0s 0 0 1.41817 0 90 56.00000 1.41817 97.5% - 0s 0 0 1.42002 0 91 56.00000 1.42002 97.5% - 0s H 0 0 53.0000000 1.42002 97.3% - 0s H 0 0 52.0000000 1.42002 97.3% - 0s 0 2 1.43502 0 91 52.00000 1.43502 97.2% - 0s * 40 39 24 42.0000000 3.28434 92.2% 29.6 0s H 54 41 39.0000000 3.38732 91.3% 30.7 0s * 120 91 23 38.0000000 5.51282 85.5% 27.6 0s * 181 134 19 35.0000000 6.00000 82.9% 28.7 0s * 368 235 17 34.0000000 9.00000 73.5% 28.8 0s * 448 276 20 33.0000000 10.11209 69.4% 28.9 0s * 1302 324 31 32.0000000 17.47059 45.4% 28.3 1s * 1763 229 27 31.0000000 20.33333 34.4% 27.8 1s Explored 2738 nodes (75839 simplex iterations) in 3.03 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 3.100000000000e+01, best bound 3.100000000000e+01, gap 0.0%