Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:33:21 2012 Optimize a model with 505 rows, 139 columns and 1010 nonzeros Presolve removed 112 rows and 4 columns Presolve time: 0.00s Presolved: 393 rows, 135 columns, 844 nonzeros Variable types: 0 continuous, 135 integer (135 binary) Found heuristic solution: objective 49.0000000 Root relaxation: objective 5.850000e+01, 217 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 58.50000 0 95 49.00000 58.50000 19.4% - 0s 0 0 57.75000 0 127 49.00000 57.75000 17.9% - 0s 0 0 56.82955 0 134 49.00000 56.82955 16.0% - 0s H 0 0 50.0000000 56.82955 13.7% - 0s 0 0 56.43151 0 134 50.00000 56.43151 12.9% - 0s 0 0 56.00242 0 135 50.00000 56.00242 12.0% - 0s H 0 0 51.0000000 56.00242 9.81% - 0s 0 0 55.81754 0 134 51.00000 55.81754 9.45% - 0s 0 0 55.73333 0 135 51.00000 55.73333 9.28% - 0s 0 0 55.55102 0 133 51.00000 55.55102 8.92% - 0s 0 0 55.47386 0 133 51.00000 55.47386 8.77% - 0s 0 0 55.37711 0 135 51.00000 55.37711 8.58% - 0s 0 0 55.32156 0 134 51.00000 55.32156 8.47% - 0s 0 0 55.26551 0 135 51.00000 55.26551 8.36% - 0s 0 0 55.26127 0 135 51.00000 55.26127 8.36% - 0s 0 0 55.26127 0 135 51.00000 55.26127 8.36% - 0s H 0 0 52.0000000 55.26127 6.27% - 0s 0 2 55.26089 0 135 52.00000 55.26089 6.27% - 0s Cutting planes: Gomory: 1 Zero half: 82 Explored 74 nodes (3616 simplex iterations) in 0.19 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 5.200000000000e+01, best bound 5.200000000000e+01, gap 0.0%