current bounds on the number of colors: 0 -- 10 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 19:35:31 2012 Optimize a model with 35 rows, 55 columns and 125 nonzeros Presolve removed 2 rows and 10 columns Presolve time: 0.00s Presolved: 33 rows, 45 columns, 115 nonzeros Variable types: 0 continuous, 45 integer (45 binary) Root relaxation: objective 0.000000e+00, 13 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 (13 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 Thu Dec 13 19:35:31 2012 Optimize a model with 20 rows, 25 columns and 50 nonzeros Presolve removed 12 rows and 15 columns Presolve time: 0.00s Presolved: 8 rows, 10 columns, 24 nonzeros Variable types: 0 continuous, 10 integer (10 binary) Root relaxation: objective 0.000000e+00, 4 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 (4 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 Thu Dec 13 19:35:31 2012 Optimize a model with 15 rows, 15 columns and 25 nonzeros Presolve removed 15 rows and 15 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