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

Optimize a model with 87 rows, 42 columns and 174 nonzeros
Presolve removed 26 rows and 7 columns
Presolve time: 0.00s
Presolved: 61 rows, 35 columns, 131 nonzeros
Variable types: 0 continuous, 35 integer (35 binary)
Found heuristic solution: objective 17.0000000

Root relaxation: objective 1.950000e+01, 40 iterations, 0.00 seconds

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

     0     0   19.50000    0   23   17.00000   19.50000  14.7%     -    0s
H    0     0                      18.0000000   19.50000  8.33%     -    0s
     0     0   19.00000    0   20   18.00000   19.00000  5.56%     -    0s
H    0     0                      19.0000000   19.00000   0.0%     -    0s

Cutting planes:
  Gomory: 1
  Zero half: 4

Explored 0 nodes (58 simplex iterations) in 0.01 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%