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

Optimize a model with 101 rows, 44 columns and 202 nonzeros
Presolve removed 22 rows and 5 columns
Presolve time: 0.00s
Presolved: 79 rows, 39 columns, 173 nonzeros
Variable types: 0 continuous, 39 integer (39 binary)
Found heuristic solution: objective 20.0000000

Root relaxation: objective 2.150000e+01, 55 iterations, 0.00 seconds

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

     0     0   21.50000    0   27   20.00000   21.50000  7.50%     -    0s
     0     0 infeasible    0        20.00000   20.99998  5.00%     -    0s

Explored 0 nodes (89 simplex iterations) in 0.00 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%