Gurobi 5.0.1 (linux64) logging started Tue Nov 20 05:50:04 2012

Optimize a model with 579 rows, 108 columns and 1158 nonzeros
Presolve removed 218 rows and 0 columns
Presolve time: 0.00s
Presolved: 361 rows, 108 columns, 902 nonzeros
Variable types: 0 continuous, 108 integer (108 binary)
Found heuristic solution: objective 29.0000000

Root relaxation: objective 3.777586e+01, 264 iterations, 0.00 seconds

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

     0     0   37.77586    0  104   29.00000   37.77586  30.3%     -    0s
H    0     0                      31.0000000   37.77586  21.9%     -    0s
     0     0   37.00000    0  104   31.00000   37.00000  19.4%     -    0s
     0     0   37.00000    0  104   31.00000   37.00000  19.4%     -    0s
     0     0   36.85601    0  106   31.00000   36.85601  18.9%     -    0s
     0     0   36.68462    0  107   31.00000   36.68462  18.3%     -    0s
     0     0   36.41187    0  106   31.00000   36.41187  17.5%     -    0s
     0     0   36.24636    0  106   31.00000   36.24636  16.9%     -    0s
     0     0   36.13012    0  106   31.00000   36.13012  16.5%     -    0s
     0     0   36.07080    0  106   31.00000   36.07080  16.4%     -    0s
     0     0   36.02017    0  107   31.00000   36.02017  16.2%     -    0s
     0     0   36.00852    0  107   31.00000   36.00852  16.2%     -    0s
     0     0   36.00852    0  107   31.00000   36.00852  16.2%     -    0s
     0     2   36.00834    0  107   31.00000   36.00834  16.2%     -    0s

Cutting planes:
  Clique: 2
  Zero half: 55

Explored 588 nodes (15594 simplex iterations) in 0.55 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%