Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:40:59 2012 Optimize a model with 615 rows, 158 columns and 1230 nonzeros Presolve removed 120 rows and 0 columns Presolve time: 0.00s Presolved: 495 rows, 158 columns, 1064 nonzeros Variable types: 0 continuous, 158 integer (158 binary) Found heuristic solution: objective 50.0000000 Root relaxation: objective 6.600000e+01, 263 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 66.00000 0 112 50.00000 66.00000 32.0% - 0s 0 0 64.53226 0 153 50.00000 64.53226 29.1% - 0s 0 0 63.14286 0 153 50.00000 63.14286 26.3% - 0s H 0 0 52.0000000 63.14286 21.4% - 0s 0 0 62.81410 0 147 52.00000 62.81410 20.8% - 0s 0 0 62.41575 0 154 52.00000 62.41575 20.0% - 0s 0 0 62.33333 0 146 52.00000 62.33333 19.9% - 0s 0 0 62.26851 0 157 52.00000 62.26851 19.7% - 0s 0 0 62.01676 0 155 52.00000 62.01676 19.3% - 0s H 0 0 54.0000000 62.01676 14.8% - 0s 0 0 61.94964 0 154 54.00000 61.94964 14.7% - 0s 0 0 61.86601 0 156 54.00000 61.86601 14.6% - 0s 0 0 61.80748 0 157 54.00000 61.80748 14.5% - 0s 0 0 61.75434 0 157 54.00000 61.75434 14.4% - 0s 0 0 61.72434 0 157 54.00000 61.72434 14.3% - 0s 0 0 61.72434 0 157 54.00000 61.72434 14.3% - 0s H 0 0 55.0000000 61.72434 12.2% - 0s 0 2 61.71866 0 157 55.00000 61.71866 12.2% - 0s * 49 23 12 56.0000000 61.36463 9.58% 45.3 0s Cutting planes: Gomory: 2 Zero half: 171 Explored 1021 nodes (32330 simplex iterations) in 1.31 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%