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

Optimize a model with 145 rows, 50 columns and 290 nonzeros
Presolve removed 44 rows and 0 columns
Presolve time: 0.00s
Presolved: 101 rows, 50 columns, 231 nonzeros
Variable types: 0 continuous, 50 integer (50 binary)
Found heuristic solution: objective 17.0000000

Root relaxation: objective 2.050000e+01, 73 iterations, 0.00 seconds

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

     0     0   20.50000    0   33   17.00000   20.50000  20.6%     -    0s
H    0     0                      18.0000000   20.50000  13.9%     -    0s
H    0     0                      19.0000000   20.50000  7.89%     -    0s
H    0     0                      20.0000000   20.50000  2.50%     -    0s

Explored 0 nodes (113 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%