Gurobi 5.0.1 (linux64) logging started Wed Apr 24 01:51:23 2013

Optimize a model with 42965 rows, 42315 columns and 169065 nonzeros
Presolve removed 2104 rows and 0 columns
Presolve time: 0.25s
Presolved: 40861 rows, 42315 columns, 164857 nonzeros
Variable types: 42250 continuous, 65 integer (65 binary)

Root relaxation: objective 7.846117e+04, 10276 iterations, 1.71 seconds

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

     0     0 78461.1740    0    6          - 78461.1740     -      -    2s
H    0     0                    82303.000000 78461.1740  4.67%     -    2s
H    0     0                    79478.000000 78461.1740  1.28%     -    2s
     0     0 78466.4026    0    8 79478.0000 78466.4026  1.27%     -    2s
     0     0 78467.0404    0    7 79478.0000 78467.0404  1.27%     -    2s
     0     0 78467.0404    0    7 79478.0000 78467.0404  1.27%     -    3s
     0     2 78470.8725    0    7 79478.0000 78470.8725  1.27%     -    4s
     2     4 78609.0510    2    6 79478.0000 78586.1737  1.12%   239    5s
H   12    11                    79134.000000 78586.1737  0.69%  88.3    5s
H   14     9                    78932.851852 78586.1737  0.44%  84.1    5s
*   21     8              20    78917.000000 78586.1737  0.42%  81.4    6s
H   27    11                    78873.000000 78634.5618  0.30%  97.1    6s
*   68     4              17    78834.000000 78780.1818  0.07%  87.9    7s

Cutting planes:
  Gomory: 2
  Flow cover: 7

Explored 75 nodes (16527 simplex iterations) in 8.03 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 7.883400000000e+04, best bound 7.883400000000e+04, gap 0.0%