Gurobi 5.0.1 (linux64) logging started Mon Feb  4 17:21:27 2013

Optimize a model with 1817 rows, 54211 columns and 2872555 nonzeros
Presolve removed 9 rows and 0 columns
Presolve time: 3.25s
Presolved: 1808 rows, 54211 columns, 2872405 nonzeros
Variable types: 0 continuous, 54211 integer (54211 binary)
Found heuristic solution: objective 26004.000000

Root simplex log...

Iteration    Objective       Primal Inf.    Dual Inf.      Time
    7673    1.8286269e+04   7.742096e+02   0.000000e+00      5s
   11603    1.8473238e+04   3.309854e+02   0.000000e+00     10s
   14354    1.8518376e+04   4.935329e+02   0.000000e+00     15s
   15428    1.8522500e+04   0.000000e+00   0.000000e+00     18s

Root relaxation: objective 1.852250e+04, 15428 iterations, 18.37 seconds

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

     0     0 18522.5000    0   60 26004.0000 18522.5000  28.8%     -   23s
H    0     0                    19168.000000 18522.5000  3.37%     -   24s
*    0     0               0    18523.000000 18523.0000   0.0%     -   29s

Cutting planes:
  Clique: 6
  Zero half: 4

Explored 0 nodes (17162 simplex iterations) in 29.06 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 1.852300000000e+04, best bound 1.852300000000e+04, gap 0.0%