Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:34:16 2012 Optimize a model with 545 rows, 145 columns and 1090 nonzeros Presolve removed 124 rows and 1 columns Presolve time: 0.00s Presolved: 421 rows, 144 columns, 917 nonzeros Variable types: 0 continuous, 144 integer (144 binary) Found heuristic solution: objective 42.0000000 Root relaxation: objective 5.782609e+01, 269 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 57.82609 0 137 42.00000 57.82609 37.7% - 0s H 0 0 48.0000000 57.82609 20.5% - 0s 0 0 56.92077 0 141 48.00000 56.92077 18.6% - 0s H 0 0 49.0000000 56.92077 16.2% - 0s 0 0 56.63291 0 139 49.00000 56.63291 15.6% - 0s H 0 0 51.0000000 56.63291 11.0% - 0s 0 0 56.19231 0 138 51.00000 56.19231 10.2% - 0s 0 0 56.10327 0 138 51.00000 56.10327 10.0% - 0s 0 0 55.97434 0 142 51.00000 55.97434 9.75% - 0s 0 0 55.86177 0 141 51.00000 55.86177 9.53% - 0s 0 0 55.81121 0 140 51.00000 55.81121 9.43% - 0s 0 0 55.72532 0 141 51.00000 55.72532 9.27% - 0s 0 0 55.51156 0 141 51.00000 55.51156 8.85% - 0s 0 0 55.44464 0 142 51.00000 55.44464 8.71% - 0s 0 0 55.38954 0 142 51.00000 55.38954 8.61% - 0s 0 0 55.37900 0 141 51.00000 55.37900 8.59% - 0s 0 0 55.30920 0 140 51.00000 55.30920 8.45% - 0s 0 0 55.23441 0 142 51.00000 55.23441 8.30% - 0s 0 0 55.19993 0 143 51.00000 55.19993 8.24% - 0s 0 0 55.19373 0 143 51.00000 55.19373 8.22% - 0s 0 0 55.19373 0 141 51.00000 55.19373 8.22% - 0s 0 2 55.19216 0 141 51.00000 55.19216 8.22% - 0s * 84 17 9 52.0000000 54.48896 4.79% 42.5 0s Cutting planes: Gomory: 1 Zero half: 115 Explored 134 nodes (6470 simplex iterations) in 0.32 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%