Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:32:31 2012

Optimize a model with 431 rows, 126 columns and 862 nonzeros
Presolve removed 89 rows and 2 columns
Presolve time: 0.00s
Presolved: 342 rows, 124 columns, 736 nonzeros
Variable types: 0 continuous, 124 integer (124 binary)
Found heuristic solution: objective 44.0000000

Root relaxation: objective 5.275000e+01, 216 iterations, 0.00 seconds

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

     0     0   52.75000    0   89   44.00000   52.75000  19.9%     -    0s
     0     0   51.60000    0  111   44.00000   51.60000  17.3%     -    0s
     0     0   51.48829    0  120   44.00000   51.48829  17.0%     -    0s
H    0     0                      46.0000000   51.48829  11.9%     -    0s
     0     0   50.92857    0  114   46.00000   50.92857  10.7%     -    0s
     0     0   50.73109    0  119   46.00000   50.73109  10.3%     -    0s
     0     0   50.59295    0  120   46.00000   50.59295  10.0%     -    0s
     0     0   50.42671    0  118   46.00000   50.42671  9.62%     -    0s
     0     0   50.22405    0  124   46.00000   50.22405  9.18%     -    0s
     0     0   49.97554    0  124   46.00000   49.97554  8.64%     -    0s
     0     0   49.91908    0  122   46.00000   49.91908  8.52%     -    0s
     0     0   49.79224    0  122   46.00000   49.79224  8.24%     -    0s
     0     0   49.76993    0  123   46.00000   49.76993  8.20%     -    0s
     0     0   49.76993    0  122   46.00000   49.76993  8.20%     -    0s
     0     2   49.76316    0  122   46.00000   49.76316  8.18%     -    0s

Cutting planes:
  Gomory: 1
  Zero half: 91

Explored 143 nodes (4624 simplex iterations) in 0.19 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 4.600000000000e+01, best bound 4.600000000000e+01, gap 0.0%