Gurobi 5.0.1 (linux64) logging started Wed Apr 24 01:22:45 2013

Optimize a model with 31976 rows, 31416 columns and 125496 nonzeros
Presolve removed 1640 rows and 0 columns
Presolve time: 0.18s
Presolved: 30336 rows, 31416 columns, 122216 nonzeros
Variable types: 31360 continuous, 56 integer (56 binary)

Root relaxation: objective 5.912550e+04, 5096 iterations, 0.58 seconds

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

     0     0 59125.4951    0    4          - 59125.4951     -      -    0s
H    0     0                    59620.000000 59125.4951  0.83%     -    0s
H    0     0                    59206.000000 59125.4951  0.14%     -    1s
     0     0 59125.6354    0    5 59206.0000 59125.6354  0.14%     -    1s
     0     0 59125.6354    0    4 59206.0000 59125.6354  0.14%     -    1s
     0     0 59125.6704    0    5 59206.0000 59125.6704  0.14%     -    2s
     0     0 59125.6704    0    5 59206.0000 59125.6704  0.14%     -    2s
     0     0 59128.5698    0    3 59206.0000 59128.5698  0.13%     -    2s
     0     2 59174.8182    0    3 59206.0000 59174.8182  0.05%     -    2s

Cutting planes:
  Gomory: 1
  Flow cover: 6

Explored 5 nodes (7046 simplex iterations) in 2.56 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 5.920600000000e+04, best bound 5.920124369748e+04, gap 0.0080%