Gurobi 5.0.1 (linux64) logging started Fri Jan 18 02:46:37 2013

Optimize a model with 2140 rows, 3020 columns and 10010 nonzeros
Presolve removed 30 rows and 20 columns
Presolve time: 0.11s
Presolved: 2110 rows, 3000 columns, 7980 nonzeros
Variable types: 2010 continuous, 990 integer (990 binary)

Root relaxation: objective 1.937272e+04, 796 iterations, 0.01 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 19450.6095    0    4          - 19450.6095     -      -    0s
H    0     0                    19611.553827 19450.6095  0.82%     -    0s
     0     0 19495.1391    0    3 19611.5538 19495.1391  0.59%     -    0s
     0     0 19495.1391    0    2 19611.5538 19495.1391  0.59%     -    0s
     0     0 19495.1391    0    3 19611.5538 19495.1391  0.59%     -    0s
H    0     0                    19520.297553 19495.1391  0.13%     -    0s
     0     0 19495.4344    0    2 19520.2976 19495.4344  0.13%     -    0s
     0     0 19495.5877    0    2 19520.2976 19495.5877  0.13%     -    0s
     0     0 19495.7425    0    2 19520.2976 19495.7425  0.13%     -    0s
     0     2 19495.8991    0    2 19520.2976 19495.8991  0.12%     -    0s
*   27    24              21    19513.736503 19503.7766  0.05%   2.7    0s

Cutting planes:
  Gomory: 1
  Flow cover: 3

Explored 198 nodes (1873 simplex iterations) in 0.46 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 1.951373650331e+04, best bound 1.951184040980e+04, gap 0.0097%