Gurobi 5.0.1 (linux64) logging started Mon Feb  4 18:52:35 2013

Optimize a model with 12383 rows, 1764 columns and 37926 nonzeros
Presolve removed 1917 rows and 912 columns
Presolve time: 0.08s
Presolved: 10466 rows, 852 columns, 32099 nonzeros
Variable types: 18 continuous, 834 integer (834 binary)
Found heuristic solution: objective 41838.000000

Root relaxation: objective 3.123815e+04, 4049 iterations, 0.17 seconds

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

     0     0 31238.1481    0    9 41838.0000 31238.1481  25.3%     -    0s
H    0     0                    31252.000000 31238.1481  0.04%     -    0s
H    0     0                    31248.000000 31238.1481  0.03%     -    0s
     0     0 31238.3864    0   21 31248.0000 31238.3864  0.03%     -    0s
     0     0 31238.3864    0    9 31248.0000 31238.3864  0.03%     -    0s
     0     0 31238.5556    0   21 31248.0000 31238.5556  0.03%     -    0s
H    0     0                    31247.000000 31238.5556  0.03%     -    0s
     0     2 31238.6675    0   21 31247.0000 31238.6675  0.03%     -    0s

Cutting planes:
  Gomory: 6
  Implied bound: 2
  MIR: 13
  GUB cover: 1
  Zero half: 10

Explored 26 nodes (5089 simplex iterations) in 0.54 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 3.124700000000e+04, best bound 3.124400000000e+04, gap 0.0096%