Gurobi 5.0.1 (linux64) logging started Mon Feb  4 19:02:33 2013

Optimize a model with 52462 rows, 4624 columns and 159528 nonzeros
Presolve removed 5052 rows and 2358 columns
Presolve time: 0.40s
Presolved: 47410 rows, 2266 columns, 144244 nonzeros
Variable types: 31 continuous, 2235 integer (2235 binary)
Found heuristic solution: objective 90323.000000

Root relaxation: objective 6.852027e+04, 22169 iterations, 2.16 seconds

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

     0     0 68520.2667    0   15 90323.0000 68520.2667  24.1%     -    2s
H    0     0                    68555.000000 68520.2667  0.05%     -    2s
H    0     0                    68534.000000 68520.2667  0.02%     -    2s
H    0     0                    68531.000000 68520.2667  0.02%     -    2s
     0     0 68521.0000    0   29 68531.0000 68521.0000  0.01%     -    3s
     0     0 68521.0000    0   15 68531.0000 68521.0000  0.01%     -    3s
     0     0 68521.0000    0   32 68531.0000 68521.0000  0.01%     -    3s
     0     2 68521.0000    0   15 68531.0000 68521.0000  0.01%     -    3s
H   11     9                    68530.000000 68521.0000  0.01%  10.7    3s
H   16    11                    68529.000000 68521.0000  0.01%   176    4s
H  363   210                    68528.000000 68521.0000  0.01%  36.5    4s
H  376   192                    68527.000000 68521.0000  0.01%  36.2    4s

Cutting planes:
  Gomory: 26
  Implied bound: 1
  MIR: 58
  Zero half: 30

Explored 376 nodes (39749 simplex iterations) in 4.94 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 6.852700000000e+04, best bound 6.852100000000e+04, gap 0.0088%