Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:36:18 2012 Optimize a model with 563 rows, 151 columns and 1126 nonzeros Presolve removed 125 rows and 7 columns Presolve time: 0.00s Presolved: 438 rows, 144 columns, 939 nonzeros Variable types: 0 continuous, 144 integer (144 binary) Found heuristic solution: objective 49.0000000 Root relaxation: objective 6.375000e+01, 231 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 63.75000 0 119 49.00000 63.75000 30.1% - 0s 0 0 62.64078 0 142 49.00000 62.64078 27.8% - 0s 0 0 61.23750 0 143 49.00000 61.23750 25.0% - 0s 0 0 60.51029 0 143 49.00000 60.51029 23.5% - 0s H 0 0 51.0000000 60.51029 18.6% - 0s 0 0 60.23826 0 143 51.00000 60.23826 18.1% - 0s 0 0 59.72853 0 143 51.00000 59.72853 17.1% - 0s 0 0 59.50817 0 144 51.00000 59.50817 16.7% - 0s 0 0 59.33821 0 144 51.00000 59.33821 16.3% - 0s 0 0 59.17186 0 143 51.00000 59.17186 16.0% - 0s 0 0 58.95907 0 144 51.00000 58.95907 15.6% - 0s 0 0 58.81229 0 143 51.00000 58.81229 15.3% - 0s 0 0 58.75853 0 144 51.00000 58.75853 15.2% - 0s 0 0 58.75853 0 144 51.00000 58.75853 15.2% - 0s H 0 0 52.0000000 58.75853 13.0% - 0s 0 2 58.75631 0 144 52.00000 58.75631 13.0% - 0s * 135 44 16 53.0000000 57.65901 8.79% 37.7 0s 613 106 55.66667 7 144 53.00000 55.90511 5.48% 32.2 5s Cutting planes: Gomory: 5 Zero half: 74 Explored 1803 nodes (51467 simplex iterations) in 6.74 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 5.300000000000e+01, best bound 5.300000000000e+01, gap 0.0%