Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:53:49 2012 Optimize a model with 685 rows, 166 columns and 1370 nonzeros Presolve removed 148 rows and 1 columns Presolve time: 0.00s Presolved: 537 rows, 165 columns, 1159 nonzeros Variable types: 0 continuous, 165 integer (165 binary) Found heuristic solution: objective 47.0000000 Root relaxation: objective 6.587500e+01, 288 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 65.87500 0 154 47.00000 65.87500 40.2% - 0s H 0 0 50.0000000 65.87500 31.8% - 0s 0 0 64.37185 0 160 50.00000 64.37185 28.7% - 0s 0 0 63.80769 0 159 50.00000 63.80769 27.6% - 0s 0 0 63.63401 0 161 50.00000 63.63401 27.3% - 0s 0 0 63.30367 0 162 50.00000 63.30367 26.6% - 0s H 0 0 51.0000000 63.30367 24.1% - 0s 0 0 63.24081 0 163 51.00000 63.24081 24.0% - 0s 0 0 62.99174 0 160 51.00000 62.99174 23.5% - 0s 0 0 62.78694 0 162 51.00000 62.78694 23.1% - 0s H 0 0 52.0000000 62.78694 20.7% - 0s 0 0 62.70180 0 163 52.00000 62.70180 20.6% - 0s 0 0 62.58858 0 162 52.00000 62.58858 20.4% - 0s 0 0 62.56678 0 162 52.00000 62.56678 20.3% - 0s 0 0 62.56678 0 162 52.00000 62.56678 20.3% - 0s 0 2 62.56678 0 162 52.00000 62.56678 20.3% - 0s * 23 18 18 54.0000000 62.56420 15.9% 41.7 0s * 260 80 16 55.0000000 61.44856 11.7% 34.8 0s 615 213 59.91362 10 162 55.00000 60.47799 10.0% 36.4 5s H 1417 260 56.0000000 59.29085 5.88% 43.2 7s Cutting planes: Gomory: 4 Zero half: 182 Explored 2285 nodes (91697 simplex iterations) in 9.26 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 5.600000000000e+01, best bound 5.600000000000e+01, gap 0.0%