Gurobi 5.0.1 (linux64) logging started Fri Jan 18 04:03:25 2013

Optimize a model with 4140 rows, 5020 columns and 18010 nonzeros
Presolve removed 30 rows and 20 columns
Presolve time: 0.22s
Presolved: 4110 rows, 5000 columns, 13980 nonzeros
Variable types: 3010 continuous, 1990 integer (1990 binary)

Root relaxation: objective 1.937272e+04, 1544 iterations, 0.02 seconds

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

     0     0 19372.7157    0    2          - 19372.7157     -      -    0s
     0     0 19450.6945    0    4          - 19450.6945     -      -    0s
H    0     0                    19625.113182 19450.6945  0.89%     -    0s
     0     0 19495.2279    0    3 19625.1132 19495.2279  0.66%     -    0s
     0     0 19495.2279    0    2 19625.1132 19495.2279  0.66%     -    0s
     0     0 19495.2279    0    3 19625.1132 19495.2279  0.66%     -    0s
H    0     0                    19596.412777 19495.2279  0.52%     -    0s
     0     2 19495.2972    0    3 19596.4128 19495.2972  0.52%     -    0s
H   57    46                    19514.543843 19503.7766  0.06%   2.2    1s
*   58    44              48    19513.742915 19503.7766  0.05%   3.6    1s

Cutting planes:
  Gomory: 1
  Flow cover: 3

Explored 1302 nodes (6626 simplex iterations) in 1.84 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 1.951374291540e+04, best bound 1.951218211497e+04, gap 0.0080%