Gurobi 5.6.3 (linux64) logging started Tue Oct  7 23:37:53 2014

Optimize a model with 20593 rows, 20592 columns and 61490 nonzeros
Presolve time: 0.43s
Presolved: 20593 rows, 20592 columns, 61490 nonzeros
Variable types: 0 continuous, 20592 integer (20592 binary)
Found heuristic solution: objective 17.9910090

Root relaxation: objective 1.242238e+01, 1786 iterations, 0.16 seconds

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

     0     0   12.42238    0   68   17.99101   12.42238  31.0%     -    0s
H    0     0                      14.4811350   12.42238  14.2%     -    0s
H    0     0                      12.4299331   12.42238  0.06%     -    0s
     0     0     cutoff    0        12.42993   12.42993  0.00%     -    0s

Cutting planes:
  Gomory: 1
  Zero half: 7

Explored 0 nodes (1794 simplex iterations) in 0.87 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 1.242993311434e+01, best bound 1.242993311434e+01, gap 0.0%