Gurobi 5.0.1 (linux64) logging started Tue Nov 20 14:02:31 2012 Optimize a model with 850 rows, 186 columns and 1700 nonzeros Presolve removed 179 rows and 0 columns Presolve time: 0.01s Presolved: 671 rows, 186 columns, 1462 nonzeros Variable types: 0 continuous, 186 integer (186 binary) Found heuristic solution: objective 50.0000000 Root relaxation: objective 7.360000e+01, 407 iterations, 0.01 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 73.60000 0 179 50.00000 73.60000 47.2% - 0s 0 0 72.03846 0 185 50.00000 72.03846 44.1% - 0s H 0 0 56.0000000 72.03846 28.6% - 0s 0 0 71.29545 0 185 56.00000 71.29545 27.3% - 0s 0 0 70.69231 0 182 56.00000 70.69231 26.2% - 0s 0 0 70.41482 0 185 56.00000 70.41482 25.7% - 0s 0 0 70.23426 0 185 56.00000 70.23426 25.4% - 0s 0 0 70.09845 0 183 56.00000 70.09845 25.2% - 0s 0 0 69.98577 0 185 56.00000 69.98577 25.0% - 0s 0 0 69.79108 0 183 56.00000 69.79108 24.6% - 0s 0 0 69.71395 0 182 56.00000 69.71395 24.5% - 0s 0 0 69.58516 0 182 56.00000 69.58516 24.3% - 0s 0 0 69.54145 0 181 56.00000 69.54145 24.2% - 0s 0 0 69.38629 0 186 56.00000 69.38629 23.9% - 0s 0 0 69.29674 0 184 56.00000 69.29674 23.7% - 0s 0 0 69.12003 0 185 56.00000 69.12003 23.4% - 0s 0 0 68.96069 0 185 56.00000 68.96069 23.1% - 0s 0 0 68.92879 0 186 56.00000 68.92879 23.1% - 0s 0 0 68.92879 0 186 56.00000 68.92879 23.1% - 0s 0 2 68.92844 0 186 56.00000 68.92844 23.1% - 0s H 12 12 59.0000000 68.92844 16.8% 70.0 0s H 109 57 60.0000000 67.95443 13.3% 60.5 0s 611 254 62.40000 20 182 60.00000 66.27857 10.5% 52.4 5s 2207 777 62.00000 30 138 60.00000 65.34848 8.91% 48.1 10s 5694 1595 61.50000 27 109 60.00000 63.75000 6.25% 38.4 15s 9543 1723 61.34800 25 130 60.00000 62.87500 4.79% 34.5 20s 14602 624 61.00000 33 106 60.00000 61.75000 2.92% 31.8 25s Cutting planes: Gomory: 2 Zero half: 85 Explored 15714 nodes (488096 simplex iterations) in 25.98 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%