current bounds on the number of colors: 0 -- 8

Gurobi 5.0.1 (linux64) logging started Thu Dec 13 17:55:52 2012

Optimize a model with 76 rows, 49 columns and 236 nonzeros
Presolve time: 0.00s
Presolved: 76 rows, 49 columns, 236 nonzeros
Variable types: 0 continuous, 49 integer (49 binary)

Root relaxation: objective 0.000000e+00, 17 iterations, 0.00 seconds

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

*    0     0               0       0.0000000    0.00000   0.0%     -    0s

Explored 0 nodes (29 simplex iterations) in 0.00 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 0.000000000000e+00, best bound 0.000000000000e+00, gap 0.0%


current bounds on the number of colors: 0 -- 4

Gurobi 5.0.1 (linux64) logging started Thu Dec 13 17:55:52 2012

Optimize a model with 42 rows, 33 columns and 118 nonzeros
Presolve removed 8 rows and 8 columns
Presolve time: 0.00s
Presolved: 34 rows, 25 columns, 102 nonzeros
Variable types: 0 continuous, 25 integer (25 binary)

Root relaxation: objective 0.000000e+00, 11 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    8          -    0.00000     -      -    0s

Explored 0 nodes (25 simplex iterations) in 0.00 seconds
Thread count was 1 (of 16 available processors)

Model objective exceeds cutoff
Best objective -, best bound 1.000000000000e+00, gap -


current bounds on the number of colors: 2 -- 4

Gurobi 5.0.1 (linux64) logging started Thu Dec 13 17:55:52 2012

Optimize a model with 59 rows, 41 columns and 177 nonzeros
Presolve time: 0.00s
Presolved: 59 rows, 41 columns, 177 nonzeros
Variable types: 0 continuous, 41 integer (41 binary)

Root relaxation: objective 0.000000e+00, 16 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   10          -    0.00000     -      -    0s
     0     0    0.00000    0   16          -    0.00000     -      -    0s

Cutting planes:
  Clique: 9
  Zero half: 6

Explored 0 nodes (69 simplex iterations) in 0.00 seconds
Thread count was 1 (of 16 available processors)

Model objective exceeds cutoff
Best objective -, best bound 1.000000000000e+00, gap -


optimal solution found: number of colors: 4