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

Optimize a model with 141 rows, 48 columns and 282 nonzeros
Presolve removed 37 rows and 0 columns
Presolve time: 0.00s
Presolved: 104 rows, 48 columns, 237 nonzeros
Variable types: 0 continuous, 48 integer (48 binary)
Found heuristic solution: objective 18.0000000

Root relaxation: objective 2.000000e+01, 68 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   38   18.00000   20.00000  11.1%     -    0s
     0     0   19.40000    0   42   18.00000   19.40000  7.78%     -    0s
     0     0     cutoff    0        18.00000   18.99998  5.56%     -    0s

Cutting planes:
  Gomory: 1
  Zero half: 10

Explored 0 nodes (149 simplex iterations) in 0.01 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 1.800000000000e+01, best bound 1.800000000000e+01, gap 0.0%