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

Optimize a model with 145 rows, 49 columns and 290 nonzeros
Presolve removed 46 rows and 4 columns
Presolve time: 0.00s
Presolved: 99 rows, 45 columns, 223 nonzeros
Variable types: 0 continuous, 45 integer (45 binary)
Found heuristic solution: objective 15.0000000

Root relaxation: objective 1.980000e+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   19.80000    0   44   15.00000   19.80000  32.0%     -    0s
H    0     0                      17.0000000   19.80000  16.5%     -    0s
     0     0   19.00000    0   41   17.00000   19.00000  11.8%     -    0s
     0     0   19.00000    0   41   17.00000   19.00000  11.8%     -    0s
     0     0   19.00000    0   41   17.00000   19.00000  11.8%     -    0s
     0     2   19.00000    0   40   17.00000   19.00000  11.8%     -    0s
*    4     3               4      18.0000000   19.00000  5.56%  21.8    0s

Explored 7 nodes (353 simplex iterations) in 0.02 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 1.800000000000e+01, best bound 1.800000000000e+01, gap 0.0%