current bounds on the number of colors: 0 -- 9

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

Optimize a model with 81 rows, 54 columns and 252 nonzeros
Presolve time: 0.00s
Presolved: 81 rows, 54 columns, 252 nonzeros
Variable types: 0 continuous, 54 integer (54 binary)

Root relaxation: objective 0.000000e+00, 18 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    6          -    0.00000     -      -    0s
H    0     0                       0.0000000    0.00000   0.0%     -    0s

Explored 0 nodes (60 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 45 rows, 36 columns and 126 nonzeros
Presolve removed 9 rows and 9 columns
Presolve time: 0.00s
Presolved: 36 rows, 27 columns, 108 nonzeros
Variable types: 0 continuous, 27 integer (27 binary)

Root relaxation: objective 0.000000e+00, 12 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    9          -    0.00000     -      -    0s

Explored 0 nodes (28 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 63 rows, 45 columns and 189 nonzeros
Presolve time: 0.00s
Presolved: 63 rows, 45 columns, 189 nonzeros
Variable types: 0 continuous, 45 integer (45 binary)

Root relaxation: objective 0.000000e+00, 19 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%


optimal solution found: number of colors: 3