Gurobi 5.0.1 (linux64) logging started Tue Nov 20 05:48:50 2012

Optimize a model with 311 rows, 81 columns and 622 nonzeros
Presolve removed 91 rows and 0 columns
Presolve time: 0.00s
Presolved: 220 rows, 81 columns, 509 nonzeros
Variable types: 0 continuous, 81 integer (81 binary)
Found heuristic solution: objective 28.0000000

Root relaxation: objective 3.200000e+01, 132 iterations, 0.00 seconds

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

     0     0   32.00000    0   64   28.00000   32.00000  14.3%     -    0s
H    0     0                      29.0000000   32.00000  10.3%     -    0s
     0     0   31.63964    0   77   29.00000   31.63964  9.10%     -    0s
     0     0   31.39271    0   76   29.00000   31.39271  8.25%     -    0s
     0     0   31.24138    0   80   29.00000   31.24138  7.73%     -    0s
     0     0   31.09290    0   75   29.00000   31.09290  7.22%     -    0s
     0     0   30.90000    0   72   29.00000   30.90000  6.55%     -    0s
     0     0   30.81967    0   77   29.00000   30.81967  6.27%     -    0s
H    0     0                      30.0000000   30.81967  2.73%     -    0s

Cutting planes:
  Clique: 1
  Zero half: 17

Explored 0 nodes (469 simplex iterations) in 0.03 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 3.000000000000e+01, best bound 3.000000000000e+01, gap 0.0%