Gurobi 5.0.1 (linux64) logging started Wed Apr 24 02:17:15 2013

Optimize a model with 48438 rows, 47748 columns and 190578 nonzeros
Presolve removed 69 rows and 0 columns
Presolve time: 0.21s
Presolved: 48369 rows, 47748 columns, 190509 nonzeros
Variable types: 47679 continuous, 69 integer (69 binary)

Root relaxation: objective 5.698051e+04, 6704 iterations, 3.68 seconds

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

     0     0 56980.5063    0   58          - 56980.5063     -      -    4s
H    0     0                    92322.000000 56980.5063  38.3%     -    6s
     0     0 71332.2189    0   13 92322.0000 71332.2189  22.7%     -   12s
H    0     0                    83809.000000 71332.2189  14.9%     -   12s
     0     0 74266.0362    0    7 83809.0000 74266.0362  11.4%     -   14s
H    0     0                    81495.000000 74266.0362  8.87%     -   14s
     0     0 75256.5670    0    3 81495.0000 75256.5670  7.65%     -   15s
H    0     0                    77171.390748 75256.5670  2.48%     -   15s
H    0     0                    76787.000000 75256.5670  1.99%     -   15s
     0     2 75261.2210    0    3 76787.0000 75261.2210  1.99%     -   17s
*    3     3               3    75411.000000 75411.0000   0.0%   136   17s

Cutting planes:
  Gomory: 1
  Implied bound: 68

Explored 4 nodes (15229 simplex iterations) in 17.97 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 7.541100000000e+04, best bound 7.541100000000e+04, gap 0.0%