Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:32:17 2012 Optimize a model with 328 rows, 114 columns and 656 nonzeros Presolve removed 64 rows and 6 columns Presolve time: 0.00s Presolved: 264 rows, 108 columns, 555 nonzeros Variable types: 0 continuous, 108 integer (108 binary) Found heuristic solution: objective 45.0000000 Root relaxation: objective 5.200000e+01, 160 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 52.00000 0 92 45.00000 52.00000 15.6% - 0s H 0 0 47.0000000 52.00000 10.6% - 0s 0 0 51.00000 0 97 47.00000 51.00000 8.51% - 0s 0 0 50.75000 0 103 47.00000 50.75000 7.98% - 0s 0 0 50.50000 0 93 47.00000 50.50000 7.45% - 0s H 0 0 48.0000000 50.50000 5.21% - 0s 0 0 50.20000 0 104 48.00000 50.20000 4.58% - 0s H 0 0 49.0000000 50.20000 2.45% - 0s 0 0 cutoff 0 49.00000 49.99995 2.04% - 0s Cutting planes: Gomory: 1 Zero half: 74 Explored 0 nodes (435 simplex iterations) in 0.03 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 4.900000000000e+01, best bound 4.900000000000e+01, gap 0.0%