current bounds on the number of colors: 0 -- 103 Gurobi 5.0.1 (linux64) logging started Fri Dec 14 18:25:13 2012 Optimize a model with 12751 rows, 5501 columns and 43197 nonzeros Presolve time: 0.09s Presolved: 12751 rows, 5501 columns, 43197 nonzeros Variable types: 0 continuous, 5501 integer (5501 binary) Root relaxation: objective 0.000000e+00, 263 iterations, 0.01 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 (263 simplex iterations) in 0.10 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 -- 51 Gurobi 5.0.1 (linux64) logging started Fri Dec 14 18:25:14 2012 Optimize a model with 6303 rows, 2823 columns and 21175 nonzeros Presolve time: 0.03s Presolved: 6303 rows, 2823 columns, 21175 nonzeros Variable types: 0 continuous, 2823 integer (2823 binary) Root relaxation: objective 0.000000e+00, 254 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 (412 simplex iterations) in 0.04 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 -- 25 Gurobi 5.0.1 (linux64) logging started Fri Dec 14 18:25:14 2012 Optimize a model with 3079 rows, 1484 columns and 10164 nonzeros Presolve time: 0.01s Presolved: 3079 rows, 1484 columns, 10164 nonzeros Variable types: 0 continuous, 1484 integer (1484 binary) Root relaxation: objective 0.000000e+00, 220 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 (374 simplex iterations) in 0.02 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 -- 12 Gurobi 5.0.1 (linux64) logging started Fri Dec 14 18:25:14 2012 Optimize a model with 1591 rows, 866 columns and 5082 nonzeros Presolve time: 0.00s Presolved: 1591 rows, 866 columns, 5082 nonzeros Variable types: 0 continuous, 866 integer (866 binary) Root relaxation: objective 0.000000e+00, 230 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 (379 simplex iterations) in 0.01 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 Fri Dec 14 18:25:14 2012 Optimize a model with 847 rows, 557 columns and 2541 nonzeros Presolve time: 0.00s Presolved: 847 rows, 557 columns, 2541 nonzeros Variable types: 0 continuous, 557 integer (557 binary) Root relaxation: objective 0.000000e+00, 242 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 0 186 - 0.00000 - - 0s 0 0 0.00000 0 176 - 0.00000 - - 0s 0 0 0.00000 0 182 - 0.00000 - - 0s 0 0 0.00000 0 188 - 0.00000 - - 0s 0 0 0.00000 0 148 - 0.00000 - - 0s 0 0 0.00000 0 172 - 0.00000 - - 0s 0 0 0.00000 0 189 - 0.00000 - - 0s 0 0 0.00000 0 189 - 0.00000 - - 0s 0 2 0.00000 0 189 - 0.00000 - - 0s Cutting planes: Zero half: 8 Explored 15 nodes (5969 simplex iterations) in 0.28 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: 3 -- 6 Gurobi 5.0.1 (linux64) logging started Fri Dec 14 18:25:14 2012 Optimize a model with 1095 rows, 660 columns and 3388 nonzeros Presolve time: 0.00s Presolved: 1095 rows, 660 columns, 3388 nonzeros Variable types: 0 continuous, 660 integer (660 binary) Root relaxation: objective 0.000000e+00, 255 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 (461 simplex iterations) in 0.01 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: 4