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

Optimize a model with 121 rows, 48 columns and 242 nonzeros
Presolve removed 27 rows and 1 columns
Presolve time: 0.00s
Presolved: 94 rows, 47 columns, 206 nonzeros
Variable types: 0 continuous, 47 integer (47 binary)
Found heuristic solution: objective 17.0000000

Root relaxation: objective 2.100000e+01, 52 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   36   17.00000   21.00000  23.5%     -    0s
H    0     0                      19.0000000   21.00000  10.5%     -    0s
     0     0   20.66667    0   45   19.00000   20.66667  8.77%     -    0s
     0     0   20.00000    0   36   19.00000   20.00000  5.26%     -    0s
     0     0   20.00000    0   41   19.00000   20.00000  5.26%     -    0s
     0     0   20.00000    0   36   19.00000   20.00000  5.26%     -    0s
     0     2   20.00000    0   36   19.00000   20.00000  5.26%     -    0s

Explored 3 nodes (220 simplex iterations) in 0.02 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%