Gurobi 5.0.1 (linux64) logging started Fri Jan 18 07:07:38 2013

Optimize a model with 4028 rows, 4044 columns and 16082 nonzeros
Presolve removed 2022 rows and 2022 columns
Presolve time: 0.19s
Presolved: 2006 rows, 2022 columns, 6044 nonzeros
Variable types: 1022 continuous, 1000 integer (1000 binary)

Root relaxation: objective 4.810927e+03, 811 iterations, 0.03 seconds

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

     0     0 4810.92679    0    2          - 4810.92679     -      -    0s
     0     0 4828.99488    0    2          - 4828.99488     -      -    0s
H    0     0                    4831.1212106 4828.99488  0.04%     -    0s
     0     0 4831.11879    0    4 4831.12121 4831.11879  0.00%     -    0s

Cutting planes:
  Gomory: 1
  Implied bound: 2
  Flow cover: 4

Explored 0 nodes (1163 simplex iterations) in 0.30 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 4.831121210611e+03, best bound 4.831118786203e+03, gap 0.0001%