Gurobi 5.0.1 (linux64) logging started Fri Nov 16 14:18:20 2012

Optimize a model with 18499 rows, 5550 columns and 60678 nonzeros
Presolve removed 2 rows and 2 columns
Presolve time: 0.66s
Presolved: 18571 rows, 5548 columns, 65654 nonzeros
Variable types: 0 continuous, 5548 integer (5548 binary)
Found heuristic solution: objective 74.0000000

Root relaxation: objective 2.000000e+00, 4018 iterations, 0.15 seconds

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

     0     0    2.00000    0  148   74.00000    2.00000  97.3%     -    1s
H    0     0                      68.0000000    2.00000  97.1%     -    1s
H    0     0                       5.0000000    2.00000  60.0%     -    1s
     0     0    3.00000    0 2216    5.00000    3.00000  40.0%     -   12s
     0     0    3.00000    0 2007    5.00000    3.00000  40.0%     -   14s
H    0     0                       4.0000000    3.00000  25.0%     -   15s
     0     0    3.00000    0 2007    4.00000    3.00000  25.0%     -   16s
     0     0    3.00000    0 1914    4.00000    3.00000  25.0%     -   23s
     0     0    3.00000    0 1376    4.00000    3.00000  25.0%     -   30s
     0     0    3.00000    0  176    4.00000    3.00000  25.0%     -   36s
     0     0 infeasible    0         4.00000    3.00001  25.0%     -   43s

Cutting planes:
  Clique: 62
  Zero half: 30

Explored 0 nodes (126535 simplex iterations) in 43.79 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 4.000000000000e+00, best bound 4.000000000000e+00, gap 0.0%