Gurobi 5.0.1 (linux64) logging started Sun Nov 18 03:12:42 2012

Optimize a model with 1 rows, 56 columns and 56 nonzeros
Model has 85 quadratic objective terms
Presolve time: 0.00s
Presolved: 86 rows, 141 columns, 311 nonzeros
Variable types: 0 continuous, 141 integer (141 binary)
Found heuristic solution: objective 36.0000000

Root relaxation: objective 0.000000e+00, 110 iterations, 0.00 seconds

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

     0     0    0.00000    0   31   36.00000    0.00000   100%     -    0s
H    0     0                      28.0000000    0.00000   100%     -    0s
     0     0    0.00000    0   41   28.00000    0.00000   100%     -    0s
     0     0    0.00000    0   21   28.00000    0.00000   100%     -    0s
H    0     0                      21.0000000    0.00000   100%     -    0s
     0     0    0.00000    0   29   21.00000    0.00000   100%     -    0s
     0     0    0.00000    0   29   21.00000    0.00000   100%     -    0s
H    0     0                      18.0000000    0.00000   100%     -    0s
     0     2    0.00000    0   20   18.00000    0.00000   100%     -    0s
H  188   121                      15.0000000    0.00000   100%   5.8    0s
H  238   143                      14.0000000    0.00000   100%   7.8    0s
*  258   138              20      13.0000000    0.00000   100%   7.5    0s
*  345   123               8      12.0000000    1.00000  91.7%  12.6    0s

Cutting planes:
  Cover: 167
  MIR: 4

Explored 571 nodes (10725 simplex iterations) in 0.19 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 1.200000000000e+01, best bound 1.200000000000e+01, gap 0.0%