Gurobi 5.0.1 (linux64) logging started Fri Nov 16 11:39:05 2012

Optimize a model with 18744 rows, 5112 columns and 61060 nonzeros
Presolve time: 0.15s
Presolved: 18744 rows, 5112 columns, 61169 nonzeros
Variable types: 0 continuous, 5112 integer (5112 binary)
Found heuristic solution: objective 47.0000000

Root relaxation: objective 2.000000e+00, 6615 iterations, 0.67 seconds

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

     0     0    2.00000    0  142   47.00000    2.00000  95.7%     -    4s
H    0     0                      17.0000000    2.00000  88.2%     -    4s
H    0     0                       5.0000000    2.00000  60.0%     -    4s
     0     0    2.00000    0  142    5.00000    2.00000  60.0%     -    8s
     0     0    2.00000    0  142    5.00000    2.00000  60.0%     -   18s
     0     0    2.00000    0  142    5.00000    2.00000  60.0%     -   27s
     0     0    2.00000    0  142    5.00000    2.00000  60.0%     -   37s
     0     0    2.00000    0  142    5.00000    2.00000  60.0%     -   48s
     0     0    2.00000    0  142    5.00000    2.00000  60.0%     -   54s
     0     2    2.00000    0  142    5.00000    2.00000  60.0%     -   83s
     1     3    3.00000    1  528    5.00000    2.00000  60.0% 49977   97s
     2     4    3.00000    1  665    5.00000    3.00000  40.0% 38184  108s
     6     4    3.00000    3  136    5.00000    3.00000  40.0% 13211  110s
*   23     4              16       4.0000000    3.00000  25.0%  4027  114s
    26     3    3.00000    2  252    4.00000    3.00000  25.0%  3767  116s
    31     2     cutoff    5         4.00000    3.00000  25.0%  3800  122s

Cutting planes:
  Clique: 152

Explored 34 nodes (259171 simplex iterations) in 124.87 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%