current bounds on the number of colors: 0 -- 105 Gurobi 5.0.1 (linux64) logging started Fri Dec 14 18:25:48 2012 Optimize a model with 13833 rows, 5724 columns and 46644 nonzeros Presolve time: 0.10s Presolved: 13833 rows, 5724 columns, 46644 nonzeros Variable types: 0 continuous, 5724 integer (5724 binary) Root relaxation: objective 0.000000e+00, 286 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 (286 simplex iterations) in 0.11 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 -- 52 Gurobi 5.0.1 (linux64) logging started Fri Dec 14 18:25:49 2012 Optimize a model with 6969 rows, 2994 columns and 23322 nonzeros Presolve time: 0.03s Presolved: 6969 rows, 2994 columns, 23322 nonzeros Variable types: 0 continuous, 2994 integer (2994 binary) Root relaxation: objective 0.000000e+00, 262 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 (442 simplex iterations) in 0.05 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 -- 26 Gurobi 5.0.1 (linux64) logging started Fri Dec 14 18:25:49 2012 Optimize a model with 3537 rows, 1629 columns and 11661 nonzeros Presolve time: 0.01s Presolved: 3537 rows, 1629 columns, 11661 nonzeros Variable types: 0 continuous, 1629 integer (1629 binary) Root relaxation: objective 0.000000e+00, 227 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 0.02 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 -- 13 Gurobi 5.0.1 (linux64) logging started Fri Dec 14 18:25:49 2012 Optimize a model with 1689 rows, 894 columns and 5382 nonzeros Presolve time: 0.00s Presolved: 1689 rows, 894 columns, 5382 nonzeros Variable types: 0 continuous, 894 integer (894 binary) Root relaxation: objective 0.000000e+00, 240 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 (394 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 18:25:49 2012 Optimize a model with 897 rows, 579 columns and 2691 nonzeros Presolve time: 0.00s Presolved: 897 rows, 579 columns, 2691 nonzeros Variable types: 0 continuous, 579 integer (579 binary) Root relaxation: objective 0.000000e+00, 273 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 0 170 - 0.00000 - - 0s 0 0 0.00000 0 164 - 0.00000 - - 0s 0 0 0.00000 0 190 - 0.00000 - - 0s 0 0 0.00000 0 192 - 0.00000 - - 0s 0 0 0.00000 0 181 - 0.00000 - - 0s 0 0 0.00000 0 202 - 0.00000 - - 0s 0 0 0.00000 0 189 - 0.00000 - - 0s 0 0 0.00000 0 182 - 0.00000 - - 0s 0 0 0.00000 0 224 - 0.00000 - - 0s 0 0 0.00000 0 224 - 0.00000 - - 0s 0 2 0.00000 0 224 - 0.00000 - - 0s Cutting planes: Zero half: 19 Explored 13 nodes (8467 simplex iterations) in 0.45 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 18:25:49 2012 Optimize a model with 1161 rows, 684 columns and 3588 nonzeros Presolve time: 0.00s Presolved: 1161 rows, 684 columns, 3588 nonzeros Variable types: 0 continuous, 684 integer (684 binary) Root relaxation: objective 0.000000e+00, 297 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 (440 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