current bounds on the number of colors: 0 -- 22 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 19:35:36 2012 Optimize a model with 341 rows, 271 columns and 1199 nonzeros Presolve time: 0.00s Presolved: 341 rows, 271 columns, 1199 nonzeros Variable types: 0 continuous, 271 integer (271 binary) Root relaxation: objective 0.000000e+00, 46 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 (73 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 Thu Dec 13 19:35:36 2012 Optimize a model with 167 rows, 139 columns and 545 nonzeros Presolve time: 0.00s Presolved: 167 rows, 139 columns, 545 nonzeros Variable types: 0 continuous, 139 integer (139 binary) Root relaxation: objective 0.000000e+00, 45 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 (45 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 19:35:36 2012 Optimize a model with 80 rows, 73 columns and 218 nonzeros Presolve removed 22 rows and 22 columns Presolve time: 0.00s Presolved: 58 rows, 51 columns, 174 nonzeros Variable types: 0 continuous, 51 integer (51 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 Explored 0 nodes (76 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 - current bounds on the number of colors: 2 -- 5 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 19:35:36 2012 Optimize a model with 109 rows, 95 columns and 327 nonzeros Presolve time: 0.00s Presolved: 109 rows, 95 columns, 327 nonzeros Variable types: 0 continuous, 95 integer (95 binary) Root relaxation: objective 0.000000e+00, 45 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 (63 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: 3