current bounds on the number of colors: 0 -- 30 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 19:35:42 2012 Optimize a model with 675 rows, 493 columns and 2385 nonzeros Presolve time: 0.00s Presolved: 675 rows, 493 columns, 2385 nonzeros Variable types: 0 continuous, 493 integer (493 binary) Root relaxation: objective 0.000000e+00, 54 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 (54 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 -- 15 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 19:35:42 2012 Optimize a model with 331 rows, 253 columns and 1113 nonzeros Presolve time: 0.00s Presolved: 331 rows, 253 columns, 1113 nonzeros Variable types: 0 continuous, 253 integer (253 binary) Root relaxation: objective 0.000000e+00, 60 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 (98 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 -- 7 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 19:35:42 2012 Optimize a model with 159 rows, 133 columns and 477 nonzeros Presolve time: 0.00s Presolved: 159 rows, 133 columns, 477 nonzeros Variable types: 0 continuous, 133 integer (133 binary) 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 0.0000000 0.00000 0.0% - 0s Explored 0 nodes (99 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 -- 3 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 19:35:42 2012 Optimize a model with 73 rows, 73 columns and 159 nonzeros Presolve removed 73 rows and 73 columns Presolve time: 0.00s Explored 0 nodes (0 simplex iterations) in 0.00 seconds Thread count was 1 (of 16 available processors) Model objective exceeds cutoff Best objective -, best bound -, gap - current bounds on the number of colors: 1 -- 3 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 19:35:42 2012 Optimize a model with 116 rows, 103 columns and 318 nonzeros Presolve removed 30 rows and 30 columns Presolve time: 0.00s Presolved: 86 rows, 73 columns, 258 nonzeros Variable types: 0 continuous, 73 integer (73 binary) Root relaxation: objective 0.000000e+00, 33 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 30 - 0.00000 - - 0s Explored 0 nodes (104 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: 3