Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:37:13 2012 Optimize a model with 553 rows, 152 columns and 1106 nonzeros Presolve removed 87 rows and 2 columns Presolve time: 0.00s Presolved: 466 rows, 150 columns, 982 nonzeros Variable types: 0 continuous, 150 integer (150 binary) Found heuristic solution: objective 48.0000000 Root relaxation: objective 6.500000e+01, 253 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 65.00000 0 128 48.00000 65.00000 35.4% - 0s 0 0 62.85841 0 144 48.00000 62.85841 31.0% - 0s H 0 0 50.0000000 62.85841 25.7% - 0s H 0 0 51.0000000 62.85841 23.3% - 0s 0 0 62.02632 0 138 51.00000 62.02632 21.6% - 0s 0 0 61.40661 0 145 51.00000 61.40661 20.4% - 0s H 0 0 52.0000000 61.40661 18.1% - 0s H 0 0 55.0000000 61.40661 11.6% - 0s 0 0 60.90983 0 146 55.00000 60.90983 10.7% - 0s 0 0 60.70714 0 148 55.00000 60.70714 10.4% - 0s 0 0 60.52428 0 146 55.00000 60.52428 10.0% - 0s 0 0 60.31331 0 147 55.00000 60.31331 9.66% - 0s 0 0 60.23659 0 149 55.00000 60.23659 9.52% - 0s 0 0 60.14736 0 147 55.00000 60.14736 9.36% - 0s 0 0 60.01330 0 147 55.00000 60.01330 9.12% - 0s 0 0 59.90649 0 149 55.00000 59.90649 8.92% - 0s 0 0 59.80883 0 147 55.00000 59.80883 8.74% - 0s 0 0 59.74945 0 148 55.00000 59.74945 8.64% - 0s 0 0 59.74945 0 146 55.00000 59.74945 8.64% - 0s 0 2 59.74856 0 146 55.00000 59.74856 8.63% - 0s Cutting planes: Gomory: 2 Zero half: 165 Explored 424 nodes (18063 simplex iterations) in 0.79 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%