Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:32:18 2012

Optimize a model with 309 rows, 115 columns and 618 nonzeros
Presolve removed 56 rows and 4 columns
Presolve time: 0.00s
Presolved: 253 rows, 111 columns, 530 nonzeros
Variable types: 0 continuous, 111 integer (111 binary)
Found heuristic solution: objective 43.0000000

Root relaxation: objective 5.050000e+01, 168 iterations, 0.00 seconds

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

     0     0   50.50000    0   87   43.00000   50.50000  17.4%     -    0s
     0     0   49.66667    0   94   43.00000   49.66667  15.5%     -    0s
H    0     0                      46.0000000   49.66667  7.97%     -    0s
H    0     0                      47.0000000   49.66667  5.67%     -    0s
     0     0   49.00000    0   94   47.00000   49.00000  4.26%     -    0s
     0     0   48.66667    0   78   47.00000   48.66667  3.55%     -    0s
     0     0   48.55556    0  105   47.00000   48.55556  3.31%     -    0s
     0     0   48.50000    0   78   47.00000   48.50000  3.19%     -    0s
     0     0   48.50000    0  101   47.00000   48.50000  3.19%     -    0s
     0     0   48.50000    0   91   47.00000   48.50000  3.19%     -    0s
     0     2   48.50000    0   91   47.00000   48.50000  3.19%     -    0s

Cutting planes:
  Zero half: 18

Explored 23 nodes (677 simplex iterations) in 0.04 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 4.700000000000e+01, best bound 4.700000000000e+01, gap 0.0%