Gurobi 5.0.1 (linux64) logging started Mon Feb  4 17:54:37 2013

Optimize a model with 1717 rows, 55660 columns and 2550385 nonzeros
Presolve removed 35 rows and 237 columns (presolve time = 5s) ...
Presolve removed 35 rows and 237 columns
Presolve time: 6.78s
Presolved: 1682 rows, 55423 columns, 2538445 nonzeros
Variable types: 0 continuous, 55423 integer (55423 binary)
Found heuristic solution: objective 28646.000000

Root simplex log...

Iteration    Objective       Primal Inf.    Dual Inf.      Time
    8913    1.8506164e+04   8.793240e+02   0.000000e+00      5s
   12788    1.8662154e+04   1.356467e+02   0.000000e+00     10s
   15038    1.8683750e+04   3.661525e+01   0.000000e+00     15s
   15520    1.8684500e+04   0.000000e+00   0.000000e+00     17s

Root relaxation: objective 1.868450e+04, 15520 iterations, 16.66 seconds
Total elapsed time = 25.27s

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

     0     0 18684.5000    0  187 28646.0000 18684.5000  34.8%     -   25s
H    0     0                    18795.000000 18684.5000  0.59%     -   29s
     0     0 18690.6000    0  218 18795.0000 18690.6000  0.56%     -   34s
H    0     0                    18791.000000 18690.6000  0.53%     -   51s
     0     0 18690.6000    0  147 18791.0000 18690.6000  0.53%     -   59s
     0     0 18691.0000    0   90 18791.0000 18691.0000  0.53%     -   62s
     0     0 18692.2857    0  232 18791.0000 18692.2857  0.53%     -   64s
*    0     0               0    18694.000000 18694.0000   0.0%     -   67s

Cutting planes:
  Clique: 24
  Zero half: 16

Explored 0 nodes (33555 simplex iterations) in 67.55 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 1.869400000000e+04, best bound 1.869400000000e+04, gap 0.0%