Gurobi 5.6.3 (linux64) logging started Tue Oct  7 23:39:42 2014

Optimize a model with 20881 rows, 20880 columns and 62352 nonzeros
Presolve time: 0.44s
Presolved: 20881 rows, 20880 columns, 62352 nonzeros
Variable types: 0 continuous, 20880 integer (20880 binary)
Found heuristic solution: objective 18.7419268

Root relaxation: objective 1.237750e+01, 2051 iterations, 0.18 seconds

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

*    0     0               0      12.3774961   12.37750  0.00%     -    0s

Explored 0 nodes (2051 simplex iterations) in 0.68 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 1.237749605342e+01, best bound 1.237749605342e+01, gap 0.0%