Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:32:50 2012 Optimize a model with 446 rows, 133 columns and 892 nonzeros Presolve removed 99 rows and 4 columns Presolve time: 0.00s Presolved: 347 rows, 129 columns, 752 nonzeros Variable types: 0 continuous, 129 integer (129 binary) Found heuristic solution: objective 43.0000000 Root relaxation: objective 5.559091e+01, 222 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 55.59091 0 119 43.00000 55.59091 29.3% - 0s H 0 0 48.0000000 55.59091 15.8% - 0s H 0 0 49.0000000 55.59091 13.5% - 0s 0 0 54.52439 0 125 49.00000 54.52439 11.3% - 0s 0 0 54.27976 0 125 49.00000 54.27976 10.8% - 0s 0 0 53.94366 0 119 49.00000 53.94366 10.1% - 0s 0 0 53.65606 0 117 49.00000 53.65606 9.50% - 0s 0 0 53.57195 0 123 49.00000 53.57195 9.33% - 0s H 0 0 50.0000000 53.57195 7.14% - 0s 0 0 53.51079 0 121 50.00000 53.51079 7.02% - 0s 0 0 53.38326 0 124 50.00000 53.38326 6.77% - 0s 0 0 53.21568 0 124 50.00000 53.21568 6.43% - 0s 0 0 53.11710 0 125 50.00000 53.11710 6.23% - 0s 0 0 52.92908 0 124 50.00000 52.92908 5.86% - 0s 0 0 52.83188 0 123 50.00000 52.83188 5.66% - 0s 0 0 52.81801 0 125 50.00000 52.81801 5.64% - 0s 0 0 52.81801 0 124 50.00000 52.81801 5.64% - 0s 0 2 52.81523 0 124 50.00000 52.81523 5.63% - 0s Cutting planes: Zero half: 70 Explored 60 nodes (2447 simplex iterations) in 0.15 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 5.000000000000e+01, best bound 5.000000000000e+01, gap 0.0%