Gurobi 5.0.1 (linux64) logging started Fri Nov 16 20:35:10 2012

Optimize a model with 12240 rows, 18632 columns and 54808 nonzeros
Presolve removed 35 rows and 4760 columns
Presolve time: 0.22s
Presolved: 12205 rows, 13872 columns, 50048 nonzeros
Variable types: 0 continuous, 13872 integer (13872 binary)
Found heuristic solution: objective 39.0000000

Root relaxation: objective 2.000000e+00, 18758 iterations, 3.01 seconds
Total elapsed time = 6.44s

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

     0     0    2.00000    0  136   39.00000    2.00000  94.9%     -    7s
H    0     0                       4.0000000    2.00000  50.0%     -    7s
     0     0    2.00000    0  520    4.00000    2.00000  50.0%     -   11s
H    0     0                       3.0000000    2.00000  33.3%     -   11s
     0     0    2.00000    0  326    3.00000    2.00000  33.3%     -   20s
     0     0    2.00000    0  240    3.00000    2.00000  33.3%     -   27s
     0     0    2.00000    0  238    3.00000    2.00000  33.3%     -   38s
     0     0    2.00000    0  273    3.00000    2.00000  33.3%     -   46s
     0     0    2.00000    0  136    3.00000    2.00000  33.3%     -   50s
     0     0    2.00000    0  242    3.00000    2.00000  33.3%     -   59s
     0     0    2.00000    0  273    3.00000    2.00000  33.3%     -   67s
     0     0    2.00000    0  136    3.00000    2.00000  33.3%     -   73s
     0     0    2.00000    0  236    3.00000    2.00000  33.3%     -   81s
     0     0    2.00000    0  236    3.00000    2.00000  33.3%     -   84s
     0     2    2.00000    0  236    3.00000    2.00000  33.3%     -   89s
     2     3    2.00000    1  236    3.00000    2.00000  33.3%  9070   91s
     4     4    2.00000    1  136    3.00000    2.00000  33.3%  4535   97s
     5     5    2.00000    1  240    3.00000    2.00000  33.3%  3628  106s
     6     6    2.00000    1  240    3.00000    2.00000  33.3%  3023  116s
     7     6    2.00000    1  136    3.00000    2.00000  33.3%  2591  126s
     8     7    2.00000    1  136    3.00000    2.00000  33.3%  2268  137s
     9     8    2.00000    1  136    3.00000    2.00000  33.3%  2016  147s
    10     8    2.00000    1  136    3.00000    2.00000  33.3%  1814  163s
    11     9    2.00000    1  136    3.00000    2.00000  33.3%  1649  171s
    13    10 infeasible   14         3.00000    2.00000  33.3% 19949  186s

Cutting planes:
  Gomory: 10
  Zero half: 1

Explored 15 nodes (569500 simplex iterations) in 186.68 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 3.000000000000e+00, best bound 3.000000000000e+00, gap 0.0%