Gurobi 5.0.1 (linux64) logging started Tue Nov 20 05:48:39 2012

Optimize a model with 157 rows, 53 columns and 314 nonzeros
Presolve removed 59 rows and 3 columns
Presolve time: 0.00s
Presolved: 98 rows, 50 columns, 234 nonzeros
Variable types: 0 continuous, 50 integer (50 binary)
Found heuristic solution: objective 17.0000000

Root relaxation: objective 2.100000e+01, 62 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   30   17.00000   21.00000  23.5%     -    0s
H    0     0                      18.0000000   21.00000  16.7%     -    0s
     0     0   20.50000    0   29   18.00000   20.50000  13.9%     -    0s
     0     0   20.28571    0   39   18.00000   20.28571  12.7%     -    0s
H    0     0                      19.0000000   20.28571  6.77%     -    0s
H    0     0                      20.0000000   20.28571  1.43%     -    0s

Cutting planes:
  Gomory: 1
  Zero half: 8

Explored 0 nodes (126 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%