current bounds on the number of colors: 0 -- 12 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 19:35:32 2012 Optimize a model with 66 rows, 81 columns and 234 nonzeros Presolve removed 3 rows and 18 columns Presolve time: 0.00s Presolved: 63 rows, 63 columns, 216 nonzeros Variable types: 0 continuous, 63 integer (63 binary) Root relaxation: objective 0.000000e+00, 17 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 (17 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 19:35:32 2012 Optimize a model with 39 rows, 45 columns and 117 nonzeros Presolve removed 3 rows and 9 columns Presolve time: 0.00s Presolved: 36 rows, 36 columns, 108 nonzeros Variable types: 0 continuous, 36 integer (36 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 0.0000000 0.00000 0.0% - 0s Explored 0 nodes (30 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 19:35:32 2012 Optimize a model with 21 rows, 21 columns and 39 nonzeros Presolve removed 21 rows and 21 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 19:35:32 2012 Optimize a model with 30 rows, 33 columns and 78 nonzeros Presolve removed 12 rows and 15 columns Presolve time: 0.00s Presolved: 18 rows, 18 columns, 54 nonzeros Variable types: 0 continuous, 18 integer (18 binary) Root relaxation: objective 0.000000e+00, 9 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 0 0 infeasible 0 - 0.10000 - - 0s Explored 0 nodes (24 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