Gurobi 5.0.1 (linux64) logging started Wed Apr 24 01:37:58 2013

Optimize a model with 37942 rows, 37332 columns and 148962 nonzeros
Presolve removed 61 rows and 0 columns
Presolve time: 0.17s
Presolved: 37881 rows, 37332 columns, 148901 nonzeros
Variable types: 37271 continuous, 61 integer (61 binary)

Root relaxation: objective 5.540873e+04, 5916 iterations, 2.61 seconds

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

     0     0 55408.7258    0   48          - 55408.7258     -      -    2s
H    0     0                    80172.000000 55408.7258  30.9%     -    4s
     0     0 68880.7063    0   11 80172.0000 68880.7063  14.1%     -    8s
H    0     0                    76684.000000 68880.7063  10.2%     -    8s
     0     0 70302.1907    0    8 76684.0000 70302.1907  8.32%     -    9s
     0     0 70520.4970    0    5 76684.0000 70520.4970  8.04%     -    9s
H    0     0                    73597.463804 70520.4970  4.18%     -    9s
H    0     0                    72013.000000 70520.4970  2.07%     -    9s
     0     2 70531.7470    0    5 72013.0000 70531.7470  2.06%     -   10s
H    3     3                    71884.697917 70603.9713  1.78%   169   11s
H    4     4                    71285.008185 70609.4298  0.95%   149   11s
H    7     6                    70960.162162 70622.6852  0.48%   104   11s
*    8     7               6    70796.000000 70622.6852  0.24%   116   11s
H   18     5                    70787.000000 70625.8746  0.23%   111   11s
H   19     6                    70759.777778 70625.8746  0.19%   107   11s
*   20     7               9    70746.000000 70625.8746  0.17%   102   11s

Cutting planes:
  Implied bound: 59

Explored 34 nodes (14101 simplex iterations) in 12.39 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 7.074600000000e+04, best bound 7.074600000000e+04, gap 0.0%