Gurobi 5.0.1 (linux64) logging started Wed Apr 24 01:04:43 2013

Optimize a model with 506 rows, 21206 columns and 42366 nonzeros
Presolve time: 0.03s
Presolved: 506 rows, 21206 columns, 42366 nonzeros
Variable types: 21160 continuous, 46 integer (46 binary)

Root relaxation: objective 4.864820e+04, 777 iterations, 0.02 seconds

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

     0     0 48648.1962    0    8          - 48648.1962     -      -    0s
H    0     0                    50975.000000 48648.1962  4.56%     -    0s
H    0     0                    49368.000000 48648.1962  1.46%     -    0s
     0     0 49129.5136    0    4 49368.0000 49129.5136  0.48%     -    0s
     0     0 49155.3152    0    6 49368.0000 49155.3152  0.43%     -    0s
     0     0 49155.3152    0    8 49368.0000 49155.3152  0.43%     -    0s
     0     0 49155.3152    0    4 49368.0000 49155.3152  0.43%     -    0s
     0     0 49155.5804    0    5 49368.0000 49155.5804  0.43%     -    0s
     0     0 49172.9693    0    6 49368.0000 49172.9693  0.40%     -    0s
     0     0 49178.2767    0    5 49368.0000 49178.2767  0.38%     -    0s
     0     0 49178.5992    0    5 49368.0000 49178.5992  0.38%     -    0s
     0     0 49178.6547    0    5 49368.0000 49178.6547  0.38%     -    0s
     0     0 49179.8892    0    5 49368.0000 49179.8892  0.38%     -    0s
     0     0 49180.1524    0    4 49368.0000 49180.1524  0.38%     -    0s
H    0     0                    49291.000000 49180.1524  0.22%     -    0s
     0     2 49200.5109    0    3 49291.0000 49200.5109  0.18%     -    0s
*    9     1               4    49283.000000 49204.8482  0.16%  35.1    0s

Cutting planes:
  Implied bound: 98
  Flow cover: 6

Explored 12 nodes (2577 simplex iterations) in 0.69 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 4.928300000000e+04, best bound 4.928223239437e+04, gap 0.0016%