Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:35:40 2012 Optimize a model with 544 rows, 150 columns and 1088 nonzeros Presolve removed 141 rows and 7 columns Presolve time: 0.00s Presolved: 403 rows, 143 columns, 879 nonzeros Variable types: 0 continuous, 143 integer (143 binary) Found heuristic solution: objective 50.0000000 Root relaxation: objective 6.095833e+01, 246 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 60.95833 0 128 50.00000 60.95833 21.9% - 0s H 0 0 51.0000000 60.95833 19.5% - 0s 0 0 60.00000 0 132 51.00000 60.00000 17.6% - 0s 0 0 59.85714 0 134 51.00000 59.85714 17.4% - 0s H 0 0 52.0000000 59.85714 15.1% - 0s 0 0 59.32143 0 136 52.00000 59.32143 14.1% - 0s H 0 0 53.0000000 59.32143 11.9% - 0s 0 0 59.05398 0 134 53.00000 59.05398 11.4% - 0s 0 0 58.82609 0 132 53.00000 58.82609 11.0% - 0s 0 0 58.68895 0 137 53.00000 58.68895 10.7% - 0s 0 0 58.45005 0 137 53.00000 58.45005 10.3% - 0s 0 0 58.35530 0 137 53.00000 58.35530 10.1% - 0s 0 0 58.26103 0 138 53.00000 58.26103 9.93% - 0s 0 0 58.22770 0 138 53.00000 58.22770 9.86% - 0s 0 0 58.15520 0 138 53.00000 58.15520 9.73% - 0s 0 0 58.10897 0 139 53.00000 58.10897 9.64% - 0s 0 0 58.06177 0 138 53.00000 58.06177 9.55% - 0s H 0 0 54.0000000 58.06177 7.52% - 0s 0 0 57.97610 0 138 54.00000 57.97610 7.36% - 0s 0 0 57.95772 0 140 54.00000 57.95772 7.33% - 0s 0 0 57.95772 0 139 54.00000 57.95772 7.33% - 0s H 0 0 55.0000000 57.95772 5.38% - 0s 0 2 57.95772 0 138 55.00000 57.95772 5.38% - 0s Cutting planes: Gomory: 1 Zero half: 99 Explored 56 nodes (3236 simplex iterations) in 0.20 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 5.500000000000e+01, best bound 5.500000000000e+01, gap 0.0%