Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:32:02 2012

Optimize a model with 170 rows, 75 columns and 340 nonzeros
Presolve removed 47 rows and 13 columns
Presolve time: 0.00s
Presolved: 123 rows, 62 columns, 253 nonzeros
Variable types: 0 continuous, 62 integer (62 binary)
Found heuristic solution: objective 31.0000000

Root relaxation: objective 3.600000e+01, 91 iterations, 0.00 seconds

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

     0     0   36.00000    0   52   31.00000   36.00000  16.1%     -    0s
H    0     0                      32.0000000   36.00000  12.5%     -    0s
     0     0   35.00000    0   54   32.00000   35.00000  9.38%     -    0s
     0     0   34.62500    0   58   32.00000   34.62500  8.20%     -    0s
     0     0   34.00000    0   54   32.00000   34.00000  6.25%     -    0s
     0     0   33.83333    0   62   32.00000   33.83333  5.73%     -    0s
H    0     0                      33.0000000   33.83333  2.53%     -    0s

Cutting planes:
  Zero half: 17

Explored 0 nodes (228 simplex iterations) in 0.01 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 3.300000000000e+01, best bound 3.300000000000e+01, gap 0.0%