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

Optimize a model with 135 rows, 49 columns and 270 nonzeros
Presolve removed 37 rows and 1 columns
Presolve time: 0.00s
Presolved: 98 rows, 48 columns, 224 nonzeros
Variable types: 0 continuous, 48 integer (48 binary)
Found heuristic solution: objective 19.0000000

Root relaxation: objective 2.146154e+01, 70 iterations, 0.00 seconds

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

     0     0   21.46154    0   47   19.00000   21.46154  13.0%     -    0s
H    0     0                      20.0000000   21.46154  7.31%     -    0s
     0     0   21.00000    0   43   20.00000   21.00000  5.00%     -    0s
     0     0     cutoff    0        20.00000   20.99998  5.00%     -    0s

Cutting planes:
  Zero half: 23

Explored 0 nodes (96 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%