Gurobi 5.0.1 (linux64) logging started Tue Nov 20 05:49:02 2012

Optimize a model with 411 rows, 92 columns and 822 nonzeros
Presolve removed 145 rows and 3 columns
Presolve time: 0.00s
Presolved: 266 rows, 89 columns, 633 nonzeros
Variable types: 0 continuous, 89 integer (89 binary)
Found heuristic solution: objective 28.0000000

Root relaxation: objective 3.481250e+01, 164 iterations, 0.00 seconds

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

     0     0   34.81250    0   86   28.00000   34.81250  24.3%     -    0s
H    0     0                      31.0000000   34.81250  12.3%     -    0s
     0     0   33.97571    0   87   31.00000   33.97571  9.60%     -    0s
     0     0   33.71108    0   84   31.00000   33.71108  8.75%     -    0s
     0     0   33.56083    0   85   31.00000   33.56083  8.26%     -    0s
     0     0   33.39631    0   84   31.00000   33.39631  7.73%     -    0s
     0     0   33.28313    0   84   31.00000   33.28313  7.36%     -    0s
     0     0   33.24144    0   81   31.00000   33.24144  7.23%     -    0s
     0     0   33.16541    0   86   31.00000   33.16541  6.99%     -    0s
     0     0   33.10831    0   83   31.00000   33.10831  6.80%     -    0s
     0     0   33.08485    0   82   31.00000   33.08485  6.73%     -    0s
     0     0   33.03522    0   85   31.00000   33.03522  6.57%     -    0s
     0     0   33.01174    0   86   31.00000   33.01174  6.49%     -    0s
     0     0   33.01174    0   82   31.00000   33.01174  6.49%     -    0s
     0     2   33.01031    0   82   31.00000   33.01031  6.48%     -    0s

Cutting planes:
  Gomory: 1
  Zero half: 36

Explored 21 nodes (1002 simplex iterations) in 0.08 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%