Gurobi 5.0.1 (linux64) logging started Sun Nov 18 03:11:38 2012

Optimize a model with 1 rows, 51 columns and 51 nonzeros
Model has 55 quadratic objective terms
Presolve removed 0 rows and 5 columns
Presolve time: 0.00s
Presolved: 56 rows, 101 columns, 211 nonzeros
Variable types: 0 continuous, 101 integer (100 binary)
Found heuristic solution: objective 21.0000000

Root relaxation: objective 0.000000e+00, 67 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   15   21.00000    0.00000   100%     -    0s
H    0     0                      15.0000000    0.00000   100%     -    0s
     0     0    0.00000    0   12   15.00000    0.00000   100%     -    0s
H    0     0                       9.0000000    0.00000   100%     -    0s
     0     0    0.00000    0   19    9.00000    0.00000   100%     -    0s
     0     0    0.00000    0   18    9.00000    0.00000   100%     -    0s
     0     2    0.00000    0   18    9.00000    0.00000   100%     -    0s
H   27    27                       7.0000000    0.00000   100%   1.6    0s
H  176    79                       6.0000000    0.50000  91.7%   5.5    0s
*  189    76              14       5.0000000    0.50000  90.0%   5.4    0s
*  236    27               6       4.0000000    3.00000  25.0%   9.5    0s

Cutting planes:
  Cover: 107

Explored 264 nodes (2619 simplex iterations) in 0.04 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 4.000000000000e+00, best bound 4.000000000000e+00, gap 0.0%