Gurobi 5.0.1 (linux64) logging started Tue Nov 20 05:48:38 2012

Optimize a model with 128 rows, 48 columns and 256 nonzeros
Presolve removed 42 rows and 2 columns
Presolve time: 0.00s
Presolved: 86 rows, 46 columns, 194 nonzeros
Variable types: 0 continuous, 46 integer (46 binary)
Found heuristic solution: objective 18.0000000

Root relaxation: objective 2.100000e+01, 50 iterations, 0.00 seconds

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

     0     0   21.00000    0   36   18.00000   21.00000  16.7%     -    0s
H    0     0                      19.0000000   21.00000  10.5%     -    0s
     0     0   20.50000    0   44   19.00000   20.50000  7.89%     -    0s
     0     0   20.17647    0   43   19.00000   20.17647  6.19%     -    0s
H    0     0                      20.0000000   20.17647  0.88%     -    0s

Cutting planes:
  Gomory: 1
  Zero half: 7

Explored 0 nodes (103 simplex iterations) in 0.01 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 2.000000000000e+01, best bound 2.000000000000e+01, gap 0.0%