Gurobi 5.0.1 (linux64) logging started Wed Apr 24 02:08:17 2013

Optimize a model with 47056 rows, 46376 columns and 185096 nonzeros
Presolve removed 68 rows and 0 columns
Presolve time: 0.21s
Presolved: 46988 rows, 46376 columns, 185028 nonzeros
Variable types: 46308 continuous, 68 integer (68 binary)

Root relaxation: objective 5.514219e+04, 5148 iterations, 2.51 seconds

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

     0     0 55142.1866    0   53          - 55142.1866     -      -    2s
H    0     0                    82784.000000 55142.1866  33.4%     -    3s
     0     0 66078.6827    0   11 82784.0000 66078.6827  20.2%     -    8s
H    0     0                    77984.000000 66078.6827  15.3%     -    9s
     0     0 69047.4688    0    6 77984.0000 69047.4688  11.5%     -   10s
H    0     0                    72557.507361 69047.4688  4.84%     -   10s
H    0     0                    71425.000000 69047.4688  3.33%     -   10s
H    0     0                    69346.000000 69047.4688  0.43%     -   10s
     0     0 69173.9009    0    7 69346.0000 69173.9009  0.25%     -   11s
     0     0 69174.6498    0    6 69346.0000 69174.6498  0.25%     -   11s
     0     0 69290.5793    0    3 69346.0000 69290.5793  0.08%     -   12s
     0     0 69290.5793    0   40 69346.0000 69290.5793  0.08%     -   15s
     0     0 69290.5793    0    7 69346.0000 69290.5793  0.08%     -   19s
     0     0 69290.5793    0    4 69346.0000 69290.5793  0.08%     -   19s
     0     0 69290.5793    0    3 69346.0000 69290.5793  0.08%     -   20s
     0     0     cutoff    0      69346.0000 69346.0000   0.0%     -   20s

Cutting planes:
  Gomory: 2
  Implied bound: 43

Explored 0 nodes (18738 simplex iterations) in 20.71 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 6.934600000000e+04, best bound 6.934600000000e+04, gap 0.0%