Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:50:47 2012 Optimize a model with 680 rows, 165 columns and 1360 nonzeros Presolve removed 157 rows and 2 columns Presolve time: 0.00s Presolved: 523 rows, 163 columns, 1144 nonzeros Variable types: 0 continuous, 163 integer (163 binary) Found heuristic solution: objective 51.0000000 Root relaxation: objective 6.575000e+01, 325 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 65.75000 0 135 51.00000 65.75000 28.9% - 0s 0 0 65.00000 0 154 51.00000 65.00000 27.5% - 0s H 0 0 53.0000000 65.00000 22.6% - 0s 0 0 63.98299 0 157 53.00000 63.98299 20.7% - 0s 0 0 63.37609 0 158 53.00000 63.37609 19.6% - 0s 0 0 63.13008 0 157 53.00000 63.13008 19.1% - 0s 0 0 63.05263 0 157 53.00000 63.05263 19.0% - 0s 0 0 62.81631 0 157 53.00000 62.81631 18.5% - 0s H 0 0 54.0000000 62.81631 16.3% - 0s 0 0 62.71630 0 158 54.00000 62.71630 16.1% - 0s 0 0 62.56794 0 156 54.00000 62.56794 15.9% - 0s 0 0 62.45479 0 155 54.00000 62.45479 15.7% - 0s 0 0 62.29569 0 156 54.00000 62.29569 15.4% - 0s 0 0 62.24730 0 156 54.00000 62.24730 15.3% - 0s 0 0 62.22931 0 157 54.00000 62.22931 15.2% - 0s 0 0 62.22931 0 154 54.00000 62.22931 15.2% - 0s 0 2 62.22355 0 154 54.00000 62.22355 15.2% - 0s H 12 12 55.0000000 62.03922 12.8% 61.6 0s H 15 15 56.0000000 62.03922 10.8% 54.5 0s * 80 26 9 57.0000000 61.48276 7.86% 44.0 0s Cutting planes: Zero half: 135 Mod-K: 1 Explored 428 nodes (17965 simplex iterations) in 0.77 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 5.700000000000e+01, best bound 5.700000000000e+01, gap 0.0%