Gurobi 5.0.1 (linux64) logging started Fri Jan 18 05:28:25 2013

Optimize a model with 10140 rows, 11020 columns and 42010 nonzeros
Presolve removed 30 rows and 20 columns
Presolve time: 0.30s
Presolved: 10110 rows, 11000 columns, 31980 nonzeros
Variable types: 6010 continuous, 4990 integer (4990 binary)

Root relaxation: objective 1.937272e+04, 3763 iterations, 0.27 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 19445.5024    0    4          - 19445.5024     -      -    0s
     0     0 19495.2462    0    3          - 19495.2462     -      -    1s
H    0     0                    19552.075823 19495.2462  0.29%     -    1s
     0     0 19495.2462    0    2 19552.0758 19495.2462  0.29%     -    1s
     0     0 19495.2462    0    3 19552.0758 19495.2462  0.29%     -    1s
     0     2 19495.2737    0    3 19552.0758 19495.2737  0.29%     -    1s
H  136   112                    19517.400792 19501.4373  0.08%   1.7    2s
*  140   110             130    19517.246067 19501.4373  0.08%   3.2    2s
H  823   402                    19513.893084 19503.8894  0.05%   4.3    3s
H  828   389                    19513.822407 19503.8894  0.05%   4.3    3s
*  829   372             128    19513.765952 19503.8894  0.05%   4.3    3s
*  831   355             129    19513.753028 19503.8894  0.05%   4.3    3s
* 1655   634              65    19513.744346 19504.4057  0.05%   3.0    4s
  3931   793 19509.6489   85    1 19513.7443 19508.2970  0.03%   2.3    5s

Cutting planes:
  Gomory: 1
  Flow cover: 3

Explored 6427 nodes (18678 simplex iterations) in 6.03 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 1.951374434571e+04, best bound 1.951179622184e+04, gap 0.0100%