Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:33:54 2012

Optimize a model with 549 rows, 143 columns and 1098 nonzeros
Presolve removed 120 rows and 0 columns
Presolve time: 0.00s
Presolved: 429 rows, 143 columns, 931 nonzeros
Variable types: 0 continuous, 143 integer (143 binary)
Found heuristic solution: objective 47.0000000

Root relaxation: objective 5.866667e+01, 248 iterations, 0.00 seconds

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

     0     0   58.66667    0  118   47.00000   58.66667  24.8%     -    0s
     0     0   57.97727    0  138   47.00000   57.97727  23.4%     -    0s
H    0     0                      48.0000000   57.97727  20.8%     -    0s
H    0     0                      49.0000000   57.97727  18.3%     -    0s
     0     0   57.25231    0  141   49.00000   57.25231  16.8%     -    0s
     0     0   56.55973    0  141   49.00000   56.55973  15.4%     -    0s
     0     0   56.29306    0  141   49.00000   56.29306  14.9%     -    0s
     0     0   56.17339    0  142   49.00000   56.17339  14.6%     -    0s
     0     0   56.03609    0  141   49.00000   56.03609  14.4%     -    0s
     0     0   55.92234    0  142   49.00000   55.92234  14.1%     -    0s
     0     0   55.90913    0  142   49.00000   55.90913  14.1%     -    0s
     0     0   55.90913    0  137   49.00000   55.90913  14.1%     -    0s
     0     2   55.90708    0  137   49.00000   55.90708  14.1%     -    0s
*   11    11               8      50.0000000   55.90708  11.8%  39.5    0s
H  110    23                      51.0000000   54.49937  6.86%  31.6    0s

Cutting planes:
  Clique: 1
  Zero half: 78

Explored 348 nodes (10291 simplex iterations) in 0.40 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 5.100000000000e+01, best bound 5.100000000000e+01, gap 0.0%