Gurobi 5.0.1 (linux64) logging started Fri Nov 16 14:15:46 2012

Optimize a model with 19757 rows, 5550 columns and 64452 nonzeros
Presolve removed 2 rows and 2 columns
Presolve time: 0.69s
Presolved: 19829 rows, 5548 columns, 69394 nonzeros
Variable types: 0 continuous, 5548 integer (5548 binary)
Found heuristic solution: objective 74.0000000

Root relaxation: objective 2.000000e+00, 4170 iterations, 0.17 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                      66.0000000    2.00000  97.0%     -    1s
H    0     0                       5.0000000    2.00000  60.0%     -    1s
     0     0    3.00000    0 3501    5.00000    3.00000  40.0%     -   10s
     0     0    3.00000    0 3501    5.00000    3.00000  40.0%     -   19s
     0     2    3.00000    0  159    5.00000    3.00000  40.0%     -   39s
     1     3    3.00348    1 4004    5.00000    3.00000  40.0% 63085   49s
     2     4    3.66667    1 2867    5.00000    3.09091  38.2% 37999   54s
     5     5    4.00000    3  134    5.00000    3.25000  35.0% 16042   55s
*   22     3              19       4.0000000    4.00000   0.0%  3727   55s

Cutting planes:
  Clique: 60
  Zero half: 5

Explored 23 nodes (142303 simplex iterations) in 55.17 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%