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

Optimize a model with 117 rows, 46 columns and 234 nonzeros
Presolve removed 37 rows and 5 columns
Presolve time: 0.00s
Presolved: 80 rows, 41 columns, 171 nonzeros
Variable types: 0 continuous, 41 integer (41 binary)
Found heuristic solution: objective 16.0000000

Root relaxation: objective 2.050000e+01, 45 iterations, 0.00 seconds

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

     0     0   20.50000    0   35   16.00000   20.50000  28.1%     -    0s
H    0     0                      17.0000000   20.50000  20.6%     -    0s
     0     0   19.75000    0   40   17.00000   19.75000  16.2%     -    0s
H    0     0                      18.0000000   19.75000  9.72%     -    0s
     0     0   19.33333    0   38   18.00000   19.33333  7.41%     -    0s
     0     0   19.20000    0   40   18.00000   19.20000  6.67%     -    0s
     0     0   19.00000    0   39   18.00000   19.00000  5.56%     -    0s
H    0     0                      19.0000000   19.00000   0.0%     -    0s

Cutting planes:
  Zero half: 13

Explored 0 nodes (130 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%