Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:33:23 2012 Optimize a model with 470 rows, 140 columns and 940 nonzeros Presolve removed 83 rows and 0 columns Presolve time: 0.00s Presolved: 387 rows, 140 columns, 825 nonzeros Variable types: 0 continuous, 140 integer (140 binary) Found heuristic solution: objective 47.0000000 Root relaxation: objective 6.061538e+01, 247 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 60.61538 0 129 47.00000 60.61538 29.0% - 0s H 0 0 51.0000000 60.61538 18.9% - 0s 0 0 59.42857 0 135 51.00000 59.42857 16.5% - 0s H 0 0 52.0000000 59.42857 14.3% - 0s 0 0 59.14722 0 138 52.00000 59.14722 13.7% - 0s 0 0 58.60870 0 135 52.00000 58.60870 12.7% - 0s 0 0 58.26316 0 132 52.00000 58.26316 12.0% - 0s 0 0 57.97947 0 139 52.00000 57.97947 11.5% - 0s 0 0 57.83562 0 138 52.00000 57.83562 11.2% - 0s 0 0 57.67930 0 138 52.00000 57.67930 10.9% - 0s 0 0 57.53146 0 138 52.00000 57.53146 10.6% - 0s 0 0 57.33542 0 138 52.00000 57.33542 10.3% - 0s 0 0 57.24276 0 139 52.00000 57.24276 10.1% - 0s 0 0 57.18752 0 139 52.00000 57.18752 10.0% - 0s 0 0 57.18417 0 139 52.00000 57.18417 10.0% - 0s 0 0 57.18417 0 139 52.00000 57.18417 10.0% - 0s 0 2 57.17646 0 139 52.00000 57.17646 10.0% - 0s * 10 10 7 53.0000000 57.00662 7.56% 43.4 0s Cutting planes: Zero half: 102 Explored 178 nodes (6392 simplex iterations) in 0.30 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 5.300000000000e+01, best bound 5.300000000000e+01, gap 0.0%