Gurobi 5.0.1 (linux64) logging started Fri Nov 16 12:07:05 2012

Optimize a model with 18814 rows, 5112 columns and 61200 nonzeros
Presolve removed 2 rows and 2 columns
Presolve time: 0.65s
Presolved: 18883 rows, 5110 columns, 65711 nonzeros
Variable types: 0 continuous, 5110 integer (5110 binary)
Found heuristic solution: objective 71.0000000

Root relaxation: objective 2.000000e+00, 3703 iterations, 0.14 seconds

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

     0     0    2.00000    0  142   71.00000    2.00000  97.2%     -    1s
H    0     0                       6.0000000    2.00000  66.7%     -    2s
     0     0    3.00000    0 3595    6.00000    3.00000  50.0%     -   16s
     0     0    3.00000    0 3230    6.00000    3.00000  50.0%     -   19s
     0     0    3.00000    0 3240    6.00000    3.00000  50.0%     -   22s
H    0     0                       5.0000000    3.00000  40.0%     -   22s
     0     0    3.00000    0 3254    5.00000    3.00000  40.0%     -   29s
     0     0    3.00000    0 3251    5.00000    3.00000  40.0%     -   37s
     0     0    3.00000    0  110    5.00000    3.00000  40.0%     -   47s
H    0     0                       4.0000000    3.00000  25.0%     -   48s
     0     0 infeasible    0         4.00000    3.00001  25.0%     -   55s

Cutting planes:
  Clique: 66
  Zero half: 83

Explored 0 nodes (149502 simplex iterations) in 55.20 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%