Gurobi 5.6.3 (linux64) logging started Wed Oct  8 01:04:30 2014

Optimize a model with 31153 rows, 31152 columns and 93104 nonzeros
Presolve time: 0.80s
Presolved: 31153 rows, 31152 columns, 93104 nonzeros
Variable types: 0 continuous, 31152 integer (31152 binary)
Found heuristic solution: objective 20.5049210

Root relaxation: objective 1.330767e+01, 2181 iterations, 0.23 seconds

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

*    0     0               0      13.3076728   13.30767  0.00%     -    1s

Explored 0 nodes (2181 simplex iterations) in 1.11 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 1.330767277347e+01, best bound 1.330767277347e+01, gap 0.0%