current bounds on the number of colors: 0 -- 43 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 19:36:01 2012 Optimize a model with 2206 rows, 1006 columns and 7392 nonzeros Presolve time: 0.01s Presolved: 2206 rows, 1006 columns, 7392 nonzeros Variable types: 0 continuous, 1006 integer (1006 binary) Root relaxation: objective 0.000000e+00, 94 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 (157 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 -- 21 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 19:36:01 2012 Optimize a model with 1073 rows, 533 columns and 3520 nonzeros Presolve time: 0.00s Presolved: 1073 rows, 533 columns, 3520 nonzeros Variable types: 0 continuous, 533 integer (533 binary) Root relaxation: objective 0.000000e+00, 96 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 (202 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 -- 10 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 19:36:01 2012 Optimize a model with 558 rows, 318 columns and 1760 nonzeros Presolve time: 0.00s Presolved: 558 rows, 318 columns, 1760 nonzeros Variable types: 0 continuous, 318 integer (318 binary) Root relaxation: objective 0.000000e+00, 96 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 (171 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 19:36:01 2012 Optimize a model with 249 rows, 189 columns and 704 nonzeros Presolve removed 43 rows and 43 columns Presolve time: 0.00s Presolved: 206 rows, 146 columns, 618 nonzeros Variable types: 0 continuous, 146 integer (146 binary) Root relaxation: objective 0.000000e+00, 44 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 43 - 0.00000 - - 0s Explored 0 nodes (165 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 19:36:01 2012 Optimize a model with 352 rows, 232 columns and 1056 nonzeros Presolve time: 0.00s Presolved: 352 rows, 232 columns, 1056 nonzeros Variable types: 0 continuous, 232 integer (232 binary) Root relaxation: objective 0.000000e+00, 97 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 63 - 0.00000 - - 0s 0 0 infeasible 0 - 0.10000 - - 0s Cutting planes: Gomory: 2 Clique: 19 Zero half: 18 Explored 0 nodes (397 simplex iterations) in 0.01 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: 3 -- 5 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 19:36:01 2012 Optimize a model with 455 rows, 275 columns and 1408 nonzeros Presolve time: 0.00s Presolved: 455 rows, 275 columns, 1408 nonzeros Variable types: 0 continuous, 275 integer (275 binary) Root relaxation: objective 0.000000e+00, 89 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 12 - 0.00000 - - 0s H 0 0 0.0000000 0.00000 0.0% - 0s Explored 0 nodes (264 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: 4