Gurobi 5.0.1 (linux64) logging started Sun Nov 18 06:42:33 2012 Optimize a model with 276 rows, 770 columns and 770 nonzeros Model has 550 quadratic constraints Presolve removed 0 rows and 15 columns Presolve time: 3.21s Presolved: 276 rows, 755 columns, 755 nonzeros Variable types: 550 continuous, 205 integer (204 binary) Root relaxation: objective 0.000000e+00, 83 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time H 0 0 143.0000000 - - - 3s 0 0 0.00000 0 89 143.00000 0.00000 100% - 3s 0 0 0.00000 0 180 143.00000 0.00000 100% - 3s 0 0 0.00000 0 179 143.00000 0.00000 100% - 3s 0 2 0.00000 0 175 143.00000 0.00000 100% - 3s H 50 50 26.0000000 2.68510 89.7% 40.5 3s * 50 50 29 22.0000000 2.68510 87.8% 40.7 3s * 51 47 28 21.0000000 2.68510 87.2% 41.5 3s 606 274 9.33354 12 461 21.00000 9.33354 55.6% 36.3 5s * 967 343 61 20.0000000 9.33354 53.3% 44.7 7s 2096 281 16.80311 37 470 20.00000 13.29688 33.5% 41.5 10s 3154 152 cutoff 36 20.00000 15.92308 20.4% 41.0 15s Explored 3558 nodes (147682 simplex iterations) in 17.86 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%