Gurobi 5.0.1 (linux64) logging started Sat Dec  8 02:35:16 2012

Optimize a model with 825 rows, 810 columns and 2954 nonzeros
Presolve removed 118 rows and 33 columns
Presolve time: 0.00s
Presolved: 707 rows, 777 columns, 2696 nonzeros
Variable types: 693 continuous, 84 integer (84 binary)

Root relaxation: objective 3.150414e+04, 140 iterations, 0.00 seconds

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

     0     0 31504.1446    0    9          - 31504.1446     -      -    0s
H    0     0                    33621.000000 31504.1446  6.30%     -    0s
H    0     0                    31817.000000 31504.1446  0.98%     -    0s
     0     0 31786.8612    0   11 31817.0000 31786.8612  0.09%     -    0s
     0     0 31787.2611    0   12 31817.0000 31787.2611  0.09%     -    0s
     0     0 31787.2611    0    8 31817.0000 31787.2611  0.09%     -    0s
     0     0 31789.4664    0   11 31817.0000 31789.4664  0.09%     -    0s
     0     0     cutoff    0      31817.0000 31817.0000   0.0%     -    0s

Cutting planes:
  Gomory: 2
  Flow cover: 1

Explored 0 nodes (241 simplex iterations) in 0.03 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 3.181700000000e+04, best bound 3.181700000000e+04, gap 0.0%