Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:32:36 2012 Optimize a model with 412 rows, 128 columns and 824 nonzeros Presolve removed 82 rows and 2 columns Presolve time: 0.00s Presolved: 330 rows, 126 columns, 706 nonzeros Variable types: 0 continuous, 126 integer (126 binary) Found heuristic solution: objective 49.0000000 Root relaxation: objective 5.500000e+01, 203 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 55.00000 0 108 49.00000 55.00000 12.2% - 0s H 0 0 50.0000000 55.00000 10.0% - 0s 0 0 54.28571 0 119 50.00000 54.28571 8.57% - 0s H 0 0 51.0000000 54.28571 6.44% - 0s 0 0 54.00000 0 123 51.00000 54.00000 5.88% - 0s 0 0 53.69672 0 123 51.00000 53.69672 5.29% - 0s 0 0 53.50000 0 122 51.00000 53.50000 4.90% - 0s 0 0 53.44737 0 124 51.00000 53.44737 4.80% - 0s 0 0 53.27848 0 116 51.00000 53.27848 4.47% - 0s 0 0 52.96809 0 125 51.00000 52.96809 3.86% - 0s 0 0 52.86377 0 117 51.00000 52.86377 3.65% - 0s 0 0 52.72229 0 116 51.00000 52.72229 3.38% - 0s 0 0 52.72165 0 115 51.00000 52.72165 3.38% - 0s 0 0 52.67005 0 118 51.00000 52.67005 3.27% - 0s 0 0 52.66574 0 124 51.00000 52.66574 3.27% - 0s 0 0 52.66574 0 124 51.00000 52.66574 3.27% - 0s 0 2 52.66574 0 124 51.00000 52.66574 3.27% - 0s Cutting planes: Gomory: 1 Zero half: 48 Explored 23 nodes (1290 simplex iterations) in 0.09 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 5.100000000000e+01, best bound 5.100000000000e+01, gap 0.0%