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

Optimize a model with 151 rows, 52 columns and 302 nonzeros
Presolve removed 69 rows and 5 columns
Presolve time: 0.00s
Presolved: 82 rows, 47 columns, 199 nonzeros
Variable types: 0 continuous, 47 integer (47 binary)
Found heuristic solution: objective 18.0000000

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   18.00000   21.00000  16.7%     -    0s
H    0     0                      20.0000000   21.00000  5.00%     -    0s
     0     0   21.00000    0   35   20.00000   21.00000  5.00%     -    0s
     0     0 infeasible    0        20.00000   20.99998  5.00%     -    0s

Cutting planes:
  Zero half: 2

Explored 0 nodes (97 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%