current bounds on the number of colors: 0 -- 23 Gurobi 5.0.1 (linux64) logging started Sat Dec 15 16:12:52 2012 Optimize a model with 45 rows, 255 columns and 319 nonzeros Presolve removed 19 rows and 209 columns Presolve time: 0.00s Presolved: 26 rows, 46 columns, 110 nonzeros Variable types: 0 continuous, 46 integer (46 binary) Root relaxation: objective 0.000000e+00, 6 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 (6 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 -- 11 Gurobi 5.0.1 (linux64) logging started Sat Dec 15 16:12:52 2012 Optimize a model with 33 rows, 117 columns and 145 nonzeros Presolve removed 19 rows and 95 columns Presolve time: 0.00s Presolved: 14 rows, 22 columns, 50 nonzeros Variable types: 0 continuous, 22 integer (22 binary) Root relaxation: objective 0.000000e+00, 6 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 (6 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 -- 5 Gurobi 5.0.1 (linux64) logging started Sat Dec 15 16:12:52 2012 Optimize a model with 27 rows, 48 columns and 58 nonzeros Presolve removed 27 rows and 48 columns Presolve time: 0.00s Explored 0 nodes (0 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 -- 2 Gurobi 5.0.1 (linux64) logging started Sat Dec 15 16:12:52 2012 Optimize a model with 25 rows, 25 columns and 29 nonzeros Presolve removed 25 rows and 25 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 - optimal solution found: number of colors: 2