Gurobi 5.0.1 (linux64) logging started Mon Feb  4 17:12:22 2013

Optimize a model with 1744 rows, 50058 columns and 2644530 nonzeros
Presolve removed 29 rows and 239 columns (presolve time = 5s) ...
Presolve removed 35 rows and 322 columns (presolve time = 10s) ...
Presolve removed 35 rows and 322 columns
Presolve time: 11.53s
Presolved: 1709 rows, 49736 columns, 2623506 nonzeros
Variable types: 0 continuous, 49736 integer (49736 binary)
Found heuristic solution: objective 28289.000000

Root simplex log...

Iteration    Objective       Primal Inf.    Dual Inf.      Time
    8179    1.8790419e+04   4.892538e+02   0.000000e+00      5s
   11608    1.8879022e+04   3.998617e+02   0.000000e+00     10s
   13801    1.8894000e+04   0.000000e+00   0.000000e+00     15s

Root relaxation: objective 1.889400e+04, 13801 iterations, 14.85 seconds

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

     0     0 18894.0000    0  141 28289.0000 18894.0000  33.2%     -   27s
H    0     0                    19046.000000 18894.0000  0.80%     -   31s
*    0     0               0    18901.000000 18901.0000   0.0%     -   34s

Cutting planes:
  Clique: 12
  Zero half: 32

Explored 0 nodes (14826 simplex iterations) in 34.77 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 1.890100000000e+04, best bound 1.890100000000e+04, gap 0.0%