current bounds on the number of colors: 0 -- 12

Gurobi 5.0.1 (linux64) logging started Thu Dec 13 17:55:53 2012

Optimize a model with 240 rows, 110 columns and 756 nonzeros
Presolve time: 0.00s
Presolved: 240 rows, 110 columns, 756 nonzeros
Variable types: 0 continuous, 110 integer (110 binary)

Root relaxation: objective 0.000000e+00, 27 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 (76 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 -- 6

Gurobi 5.0.1 (linux64) logging started Thu Dec 13 17:55:53 2012

Optimize a model with 126 rows, 74 columns and 378 nonzeros
Presolve time: 0.00s
Presolved: 126 rows, 74 columns, 378 nonzeros
Variable types: 0 continuous, 74 integer (74 binary)

Root relaxation: objective 0.000000e+00, 24 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   22          -    0.00000     -      -    0s
     0     0    0.00000    0   22          -    0.00000     -      -    0s
     0     0 infeasible    0               -    0.10000     -      -    0s

Explored 0 nodes (162 simplex iterations) in 0.01 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: 3 -- 6

Gurobi 5.0.1 (linux64) logging started Thu Dec 13 17:55:54 2012

Optimize a model with 164 rows, 86 columns and 504 nonzeros
Presolve time: 0.00s
Presolved: 164 rows, 86 columns, 504 nonzeros
Variable types: 0 continuous, 86 integer (86 binary)

Root relaxation: objective 0.000000e+00, 24 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 (55 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: 4