Gurobi 5.0.1 (linux64) logging started Wed Apr 24 01:43:15 2013

Optimize a model with 40383 rows, 39753 columns and 158823 nonzeros
Presolve removed 3951 rows and 0 columns
Presolve time: 0.24s
Presolved: 36432 rows, 39753 columns, 150921 nonzeros
Variable types: 39690 continuous, 63 integer (63 binary)

Root relaxation: objective 7.529640e+04, 8348 iterations, 1.17 seconds

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

     0     0 75296.3978    0    4          - 75296.3978     -      -    1s
H    0     0                    77060.000000 75296.3978  2.29%     -    1s
H    0     0                    76124.000000 75296.3978  1.09%     -    1s
H    0     0                    75595.000000 75296.3978  0.40%     -    1s
     0     0 75296.7834    0    5 75595.0000 75296.7834  0.39%     -    1s
     0     0 75297.0540    0    5 75595.0000 75297.0540  0.39%     -    2s
H    0     0                    75370.000000 75297.0540  0.10%     -    2s
     0     0 75297.9312    0    3 75370.0000 75297.9312  0.10%     -    3s
     0     0 75298.9797    0    4 75370.0000 75298.9797  0.09%     -    4s
     0     0 75299.2521    0    4 75370.0000 75299.2521  0.09%     -    4s
     0     2 75315.2943    0    4 75370.0000 75315.2943  0.07%     -    4s
*    3     3               3    75363.000000 75340.8947  0.03%  27.0    4s

Cutting planes:
  Gomory: 1
  Flow cover: 3

Explored 9 nodes (11852 simplex iterations) in 4.80 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 7.536300000000e+04, best bound 7.536059335038e+04, gap 0.0032%