Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:32:01 2012

Optimize a model with 123 rows, 67 columns and 246 nonzeros
Presolve removed 47 rows and 19 columns
Presolve time: 0.00s
Presolved: 76 rows, 48 columns, 156 nonzeros
Variable types: 0 continuous, 48 integer (48 binary)
Found heuristic solution: objective 29.0000000

Root relaxation: objective 3.300000e+01, 54 iterations, 0.00 seconds

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

     0     0   33.00000    0   40   29.00000   33.00000  13.8%     -    0s
H    0     0                      30.0000000   33.00000  10.0%     -    0s
     0     0   31.66667    0   39   30.00000   31.66667  5.56%     -    0s
H    0     0                      31.0000000   31.66667  2.15%     -    0s

Cutting planes:
  Gomory: 2
  Zero half: 4

Explored 0 nodes (89 simplex iterations) in 0.01 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 3.100000000000e+01, best bound 3.100000000000e+01, gap 0.0%