Gurobi 5.0.1 (linux64) logging started Fri Jan 18 02:46:57 2013

Optimize a model with 280 rows, 3650 columns and 22150 nonzeros
Presolve removed 10 rows and 570 columns
Presolve time: 0.03s
Presolved: 270 rows, 3080 columns, 20150 nonzeros
Variable types: 3010 continuous, 70 integer (70 binary)

Root relaxation: objective 1.937272e+04, 126 iterations, 0.00 seconds

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

     0     0 19372.7157    0    8          - 19372.7157     -      -    0s
     0     0 19373.7670    0    8          - 19373.7670     -      -    0s
     0     0 19441.7427    0    7          - 19441.7427     -      -    0s
     0     0 19441.7427    0    7          - 19441.7427     -      -    0s
H    0     0                    19808.990879 19441.7427  1.85%     -    0s
     0     2 19441.7427    0    7 19808.9909 19441.7427  1.85%     -    0s
*   20    13              19    19526.856383 19497.3203  0.15%   7.5    0s
*   21    11              19    19518.491561 19497.3203  0.11%   7.2    0s
H   28     7                    19514.479721 19510.8505  0.02%   6.0    0s

Cutting planes:
  Flow cover: 1

Explored 75 nodes (603 simplex iterations) in 0.25 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 1.951447972079e+04, best bound 1.951260629062e+04, gap 0.0096%