Gurobi 5.0.1 (linux64) logging started Sun Nov 18 03:19:22 2012

Optimize a model with 221 rows, 172 columns and 722 nonzeros
Presolve time: 0.00s
Presolved: 221 rows, 172 columns, 722 nonzeros
Variable types: 0 continuous, 172 integer (172 binary)
Found heuristic solution: objective 42.0000000

Root relaxation: objective 0.000000e+00, 106 iterations, 0.00 seconds

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

     0     0    0.00000    0   62   42.00000    0.00000   100%     -    0s
H    0     0                      38.0000000    0.00000   100%     -    0s
     0     0    0.50000    0   63   38.00000    0.50000  98.7%     -    0s
     0     0    0.50980    0   65   38.00000    0.50980  98.7%     -    0s
H    0     0                      35.0000000    0.50980  98.5%     -    0s
     0     0    0.58385    0   65   35.00000    0.58385  98.3%     -    0s
     0     0    0.60806    0   65   35.00000    0.60806  98.3%     -    0s
     0     0    0.60806    0   65   35.00000    0.60806  98.3%     -    0s
     0     0    0.60806    0   65   35.00000    0.60806  98.3%     -    0s
     0     2    0.66201    0   65   35.00000    0.66201  98.1%     -    0s
*   27    24              20      20.0000000    3.46348  82.7%  21.4    0s
*  130    57              12      19.0000000    7.57143  60.2%  20.5    0s
*  259    61              12      18.0000000    8.75556  51.4%  17.9    0s

Cutting planes:
  Gomory: 1
  Zero half: 5

Explored 657 nodes (11110 simplex iterations) in 0.36 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%