Gurobi 5.0.1 (linux64) logging started Mon Feb  4 17:30:37 2013

Optimize a model with 1847 rows, 56368 columns and 2950147 nonzeros
Presolve removed 23 rows and 115 columns (presolve time = 5s) ...
Presolve removed 23 rows and 115 columns
Presolve time: 6.21s
Presolved: 1824 rows, 56253 columns, 2944989 nonzeros
Variable types: 0 continuous, 56253 integer (56253 binary)
Found heuristic solution: objective 23934.000000

Root simplex log...

Iteration    Objective       Primal Inf.    Dual Inf.      Time
    7323    1.9332330e+04   2.290716e+02   0.000000e+00      5s
   10359    1.9436665e+04   6.173279e+03   0.000000e+00     10s
   12735    1.9460750e+04   3.672840e+01   0.000000e+00     15s
   13189    1.9461800e+04   0.000000e+00   0.000000e+00     16s

Root relaxation: objective 1.946180e+04, 13189 iterations, 16.45 seconds

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

     0     0 19461.8000    0  122 23934.0000 19461.8000  18.7%     -   24s
H    0     0                    20934.000000 19461.8000  7.03%     -   30s
*    0     0               0    19488.000000 19488.0000   0.0%     -   36s

Cutting planes:
  Clique: 17
  Zero half: 5

Explored 0 nodes (15503 simplex iterations) in 36.85 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 1.948800000000e+04, best bound 1.948800000000e+04, gap 0.0000%