Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:32:14 2012

Optimize a model with 274 rows, 109 columns and 548 nonzeros
Presolve removed 75 rows and 15 columns
Presolve time: 0.00s
Presolved: 199 rows, 94 columns, 420 nonzeros
Variable types: 0 continuous, 94 integer (94 binary)
Found heuristic solution: objective 45.0000000

Root relaxation: objective 5.100000e+01, 120 iterations, 0.00 seconds

    Nodes    |    Current Node    |     Objective Bounds      |     Work
 Expl Unexpl |  Obj  Depth IntInf | Incumbent    BestBd   Gap | It/Node Time

     0     0   51.00000    0   72   45.00000   51.00000  13.3%     -    0s
H    0     0                      47.0000000   51.00000  8.51%     -    0s
     0     0   50.33333    0   91   47.00000   50.33333  7.09%     -    0s
H    0     0                      48.0000000   50.33333  4.86%     -    0s
     0     0   49.77273    0   90   48.00000   49.77273  3.69%     -    0s
     0     0   49.63158    0   89   48.00000   49.63158  3.40%     -    0s
     0     0   49.47059    0   91   48.00000   49.47059  3.06%     -    0s
     0     0   49.37903    0   92   48.00000   49.37903  2.87%     -    0s
     0     0   49.28571    0   87   48.00000   49.28571  2.68%     -    0s
     0     0   49.00000    0   81   48.00000   49.00000  2.08%     -    0s
     0     0     cutoff    0        48.00000   48.99995  2.08%     -    0s

Cutting planes:
  Gomory: 1
  Zero half: 32

Explored 0 nodes (446 simplex iterations) in 0.03 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 4.800000000000e+01, best bound 4.800000000000e+01, gap 0.0%