Gurobi 5.0.1 (linux64) logging started Wed Apr 24 01:49:58 2013

Optimize a model with 41728 rows, 41088 columns and 163968 nonzeros
Presolve removed 64 rows and 0 columns
Presolve time: 0.18s
Presolved: 41664 rows, 41088 columns, 163904 nonzeros
Variable types: 41024 continuous, 64 integer (64 binary)

Root relaxation: objective 5.540358e+04, 5527 iterations, 2.88 seconds

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

     0     0 55403.5770    0   53          - 55403.5770     -      -    3s
H    0     0                    86266.000000 55403.5770  35.8%     -    4s
     0     0 70633.1371    0   11 86266.0000 70633.1371  18.1%     -    9s
H    0     0                    83490.013783 70633.1371  15.4%     -    9s
H    0     0                    79398.000000 70633.1371  11.0%     -    9s
     0     0 72251.1413    0    7 79398.0000 72251.1413  9.00%     -   10s
H    0     0                    77565.720890 72251.1413  6.85%     -   10s
H    0     0                    76085.000000 72251.1413  5.04%     -   10s
     0     0 72333.5547    0    7 76085.0000 72333.5547  4.93%     -   10s
     0     0 72336.2480    0    5 76085.0000 72336.2480  4.93%     -   10s
H    0     0                    75101.797786 72336.2480  3.68%     -   10s
H    0     0                    74364.000000 72336.2480  2.73%     -   10s
H    0     0                    72701.000000 72336.2480  0.50%     -   11s
     0     2 72344.2646    0    5 72701.0000 72344.2646  0.49%     -   11s
*    8     6               8    72455.000000 72417.0830  0.05%  89.9   12s

Cutting planes:
  Gomory: 1
  Implied bound: 62

Explored 14 nodes (11757 simplex iterations) in 12.14 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 7.245500000000e+04, best bound 7.244862400162e+04, gap 0.0088%