Gurobi 5.0.1 (linux64) logging started Tue Nov 20 13:26:43 2012 Optimize a model with 801 rows, 179 columns and 1602 nonzeros Presolve removed 189 rows and 0 columns Presolve time: 0.01s Presolved: 612 rows, 179 columns, 1349 nonzeros Variable types: 0 continuous, 179 integer (179 binary) Found heuristic solution: objective 50.0000000 Root relaxation: objective 7.104167e+01, 397 iterations, 0.01 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 71.04167 0 171 50.00000 71.04167 42.1% - 0s H 0 0 52.0000000 71.04167 36.6% - 0s 0 0 69.62375 0 177 52.00000 69.62375 33.9% - 0s 0 0 68.84824 0 178 52.00000 68.84824 32.4% - 0s 0 0 68.44149 0 178 52.00000 68.44149 31.6% - 0s H 0 0 54.0000000 68.44149 26.7% - 0s 0 0 67.75611 0 178 54.00000 67.75611 25.5% - 0s 0 0 67.58642 0 179 54.00000 67.58642 25.2% - 0s H 0 0 55.0000000 67.58642 22.9% - 0s 0 0 67.39967 0 178 55.00000 67.39967 22.5% - 0s 0 0 67.27589 0 178 55.00000 67.27589 22.3% - 0s 0 0 67.18316 0 177 55.00000 67.18316 22.2% - 0s 0 0 67.09280 0 179 55.00000 67.09280 22.0% - 0s 0 0 67.03597 0 179 55.00000 67.03597 21.9% - 0s 0 0 66.92653 0 179 55.00000 66.92653 21.7% - 0s 0 0 66.89627 0 178 55.00000 66.89627 21.6% - 0s H 0 0 56.0000000 66.89627 19.5% - 0s 0 0 66.83702 0 177 56.00000 66.83702 19.4% - 0s 0 0 66.81916 0 176 56.00000 66.81916 19.3% - 0s 0 0 66.79917 0 177 56.00000 66.79917 19.3% - 0s 0 0 66.79917 0 176 56.00000 66.79917 19.3% - 0s 0 2 66.79670 0 176 56.00000 66.79670 19.3% - 0s * 20 18 18 57.0000000 66.79670 17.2% 49.8 0s * 36 18 10 58.0000000 66.62659 14.9% 47.9 0s H 117 34 60.0000000 65.68468 9.47% 50.1 0s 697 179 cutoff 31 60.00000 63.86029 6.43% 54.4 5s Cutting planes: Gomory: 3 Zero half: 68 Explored 2467 nodes (96521 simplex iterations) in 8.03 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 6.000000000000e+01, best bound 6.000000000000e+01, gap 0.0%