Gurobi 5.0.1 (linux64) logging started Sun Nov 18 03:19:45 2012

Optimize a model with 237 rows, 181 columns and 771 nonzeros
Presolve removed 0 rows and 1 columns
Presolve time: 0.00s
Presolved: 237 rows, 180 columns, 770 nonzeros
Variable types: 0 continuous, 180 integer (179 binary)
Found heuristic solution: objective 48.0000000

Root relaxation: objective 0.000000e+00, 96 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   61   48.00000    0.00000   100%     -    0s
H    0     0                      43.0000000    0.00000   100%     -    0s
H    0     0                      30.0000000    0.00000   100%     -    0s
     0     0    0.52823    0   62   30.00000    0.52823  98.2%     -    0s
H    0     0                      29.0000000    0.52823  98.2%     -    0s
     0     0    1.00000    0   61   29.00000    1.00000  96.6%     -    0s
     0     0    1.00000    0   61   29.00000    1.00000  96.6%     -    0s
H    0     0                      28.0000000    1.00000  96.4%     -    0s
H    0     0                      27.0000000    1.00000  96.3%     -    0s
H    0     0                      24.0000000    1.00000  95.8%     -    0s
     0     2    1.00000    0   61   24.00000    1.00000  95.8%     -    0s
*   55    37              16      23.0000000    4.83333  79.0%  26.5    0s
*  132    82              15      22.0000000    6.00000  72.7%  24.3    0s
*  166    97              11      20.0000000    7.39130  63.0%  24.8    0s
*  526   130              12      19.0000000   11.25000  40.8%  22.8    0s

Cutting planes:
  Gomory: 2
  Zero half: 7

Explored 991 nodes (20963 simplex iterations) in 0.52 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%