Gurobi 5.0.1 (linux64) logging started Sun Nov 18 03:30:17 2012 Optimize a model with 321 rows, 236 columns and 1036 nonzeros Presolve removed 0 rows and 2 columns Presolve time: 0.00s Presolved: 321 rows, 234 columns, 1034 nonzeros Variable types: 0 continuous, 234 integer (233 binary) Found heuristic solution: objective 73.0000000 Root relaxation: objective 0.000000e+00, 122 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 73 73.00000 0.00000 100% - 0s H 0 0 53.0000000 0.00000 100% - 0s 0 0 0.47945 0 74 53.00000 0.47945 99.1% - 0s H 0 0 52.0000000 0.47945 99.1% - 0s 0 0 1.00000 0 77 52.00000 1.00000 98.1% - 0s H 0 0 50.0000000 1.00000 98.0% - 0s 0 0 1.00000 0 77 50.00000 1.00000 98.0% - 0s 0 0 1.00000 0 76 50.00000 1.00000 98.0% - 0s H 0 0 48.0000000 1.00000 97.9% - 0s H 0 0 47.0000000 1.00000 97.9% - 0s 0 2 1.00000 0 74 47.00000 1.00000 97.9% - 0s H 27 27 44.0000000 3.07286 93.0% 41.3 0s * 45 45 24 36.0000000 3.07286 91.5% 31.6 0s * 47 39 23 35.0000000 3.07286 91.2% 31.3 0s * 184 147 19 34.0000000 8.50000 75.0% 30.1 0s * 404 280 22 33.0000000 10.66667 67.7% 29.3 0s * 728 392 27 32.0000000 13.00000 59.4% 29.5 0s * 1806 146 29 31.0000000 21.40000 31.0% 26.3 1s Explored 2588 nodes (64992 simplex iterations) in 2.22 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%