Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:32:17 2012

Optimize a model with 316 rows, 113 columns and 632 nonzeros
Presolve removed 85 rows and 12 columns
Presolve time: 0.00s
Presolved: 231 rows, 101 columns, 492 nonzeros
Variable types: 0 continuous, 101 integer (101 binary)
Found heuristic solution: objective 45.0000000

Root relaxation: objective 5.000000e+01, 135 iterations, 0.00 seconds

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

     0     0   50.00000    0   84   45.00000   50.00000  11.1%     -    0s
H    0     0                      48.0000000   50.00000  4.17%     -    0s
     0     0   49.56522    0   96   48.00000   49.56522  3.26%     -    0s
     0     0     cutoff    0        48.00000   48.99995  2.08%     -    0s

Cutting planes:
  Gomory: 1
  Zero half: 60

Explored 0 nodes (252 simplex iterations) in 0.02 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%