Gurobi 5.0.1 (linux64) logging started Sat Nov 17 23:55:26 2012 Optimize a model with 1 rows, 48 columns and 48 nonzeros Model has 141 quadratic objective terms Modified 48 Q diagonals Presolve time: 0.01s Presolved: 1 rows, 48 columns, 48 nonzeros Presolved model has 189 quadratic objective terms Variable types: 0 continuous, 48 integer (48 binary) Found heuristic solution: objective 75.0000000 Root relaxation: objective 0.000000e+00, 49 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 48 75.00000 0.00000 100% - 0s H 0 0 55.0000000 0.00000 100% - 0s H 0 0 51.0000000 0.00000 100% - 0s H 0 0 44.0000000 0.00000 100% - 0s H 0 0 41.0000000 0.00000 100% - 0s 0 2 2.19127 0 48 41.00000 2.19127 94.7% - 0s H 65 59 40.0000000 2.84546 92.9% 2.2 0s H 81 72 38.0000000 2.84546 92.5% 2.1 0s H 109 90 37.0000000 2.84546 92.3% 2.2 0s H 174 129 33.0000000 5.62694 82.9% 2.3 0s H 1118 613 32.0000000 10.14415 68.3% 2.3 0s 54154 21282 30.05607 26 32 32.00000 22.29019 30.3% 2.2 5s 109147 34982 28.27217 29 28 32.00000 24.11130 24.7% 2.2 10s 164055 44198 30.22756 26 32 32.00000 25.16853 21.3% 2.2 15s 218512 49807 30.21784 29 29 32.00000 25.94047 18.9% 2.2 20s 273037 52009 30.45829 32 25 32.00000 26.55101 17.0% 2.2 25s 327884 50975 28.67080 28 30 32.00000 27.09709 15.3% 2.2 30s 382859 46817 29.56789 28 30 32.00000 27.60067 13.7% 2.2 35s 437751 39377 30.11059 34 24 32.00000 28.13567 12.1% 2.2 40s 492498 27641 28.84225 29 29 32.00000 28.84225 9.87% 2.2 45s 546664 6412 30.29933 26 32 32.00000 30.29933 5.31% 2.2 50s Explored 554132 nodes (1231904 simplex iterations) in 50.83 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 3.200000000000e+01, best bound 3.200000000000e+01, gap 0.0%