Gurobi 5.0.1 (linux64) logging started Tue Nov 20 05:48:37 2012

Optimize a model with 92 rows, 41 columns and 184 nonzeros
Presolve removed 63 rows and 21 columns
Presolve time: 0.00s
Presolved: 29 rows, 20 columns, 58 nonzeros
Variable types: 0 continuous, 20 integer (20 binary)
Found heuristic solution: objective 18.0000000

Root relaxation: objective 2.000000e+01, 25 iterations, 0.00 seconds

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

     0     0   20.00000    0   20   18.00000   20.00000  11.1%     -    0s
     0     0   19.33333    0   20   18.00000   19.33333  7.41%     -    0s
H    0     0                      19.0000000   19.33333  1.75%     -    0s

Cutting planes:
  Gomory: 1
  Zero half: 2

Explored 0 nodes (35 simplex iterations) in 0.00 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 1.900000000000e+01, best bound 1.900000000000e+01, gap 0.0%