Gurobi 5.0.1 (linux64) logging started Wed Apr 24 02:06:50 2013

Optimize a model with 46988 rows, 46308 columns and 185028 nonzeros
Presolve removed 1977 rows and 0 columns
Presolve time: 0.28s
Presolved: 45011 rows, 46308 columns, 181074 nonzeros
Variable types: 46240 continuous, 68 integer (68 binary)

Root relaxation: objective 7.347257e+04, 9780 iterations, 1.90 seconds

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

     0     0 73472.5683    0    4          - 73472.5683     -      -    2s
H    0     0                    74324.000000 73472.5683  1.15%     -    2s
H    0     0                    73570.000000 73472.5683  0.13%     -    2s
     0     0 73488.1535    0    4 73570.0000 73488.1535  0.11%     -    2s
     0     0 73488.1535    0    4 73570.0000 73488.1535  0.11%     -    3s
     0     0 73488.1535    0    4 73570.0000 73488.1535  0.11%     -    4s
     0     0 73488.1535    0    4 73570.0000 73488.1535  0.11%     -    4s
     0     0 73488.2463    0    4 73570.0000 73488.2463  0.11%     -    4s
     0     0 73506.1519    0    1 73570.0000 73506.1519  0.09%     -    4s
*    0     0               0    73526.000000 73526.0000   0.0%     -    4s

Cutting planes:
  Gomory: 1
  Flow cover: 5

Explored 0 nodes (12654 simplex iterations) in 4.50 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 7.352600000000e+04, best bound 7.352600000000e+04, gap 0.0%