current bounds on the number of colors: 0 -- 30 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 17:56:41 2012 Optimize a model with 3465 rows, 679 columns and 10755 nonzeros Presolve time: 0.01s Presolved: 3465 rows, 679 columns, 10755 nonzeros Variable types: 0 continuous, 679 integer (679 binary) Root relaxation: objective 0.000000e+00, 63 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 (156 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 -- 15 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 17:56:41 2012 Optimize a model with 1633 rows, 439 columns and 5019 nonzeros Presolve time: 0.00s Presolved: 1633 rows, 439 columns, 5019 nonzeros Variable types: 0 continuous, 439 integer (439 binary) Root relaxation: objective 0.000000e+00, 61 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 34 - 0.00000 - - 0s 0 0 0.00000 0 26 - 0.00000 - - 0s Cutting planes: Clique: 5 Explored 0 nodes (771 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 -- 7 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 17:56:41 2012 Optimize a model with 717 rows, 319 columns and 2151 nonzeros Presolve time: 0.00s Presolved: 717 rows, 319 columns, 2151 nonzeros Variable types: 0 continuous, 319 integer (319 binary) Root relaxation: objective 0.000000e+00, 61 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 58 - 0.00000 - - 0s 0 0 infeasible 0 - 0.10000 - - 0s Cutting planes: Gomory: 3 Clique: 130 Zero half: 151 Explored 0 nodes (230 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 -- 7 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 17:56:41 2012 Optimize a model with 1175 rows, 379 columns and 3585 nonzeros Presolve time: 0.00s Presolved: 1175 rows, 379 columns, 3585 nonzeros Variable types: 0 continuous, 379 integer (379 binary) Root relaxation: objective 0.000000e+00, 60 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 46 - 0.00000 - - 0s 0 0 0.00000 0 58 - 0.00000 - - 0s 0 0 infeasible 0 - 0.10000 - - 0s Explored 0 nodes (1050 simplex iterations) in 0.07 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: 5 -- 7 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 17:56:41 2012 Optimize a model with 1404 rows, 409 columns and 4302 nonzeros Presolve time: 0.00s Presolved: 1404 rows, 409 columns, 4302 nonzeros Variable types: 0 continuous, 409 integer (409 binary) Root relaxation: objective 0.000000e+00, 60 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 38 - 0.00000 - - 0s 0 0 0.00000 0 20 - 0.00000 - - 0s 0 0 0.00000 0 134 - 0.00000 - - 0s 0 0 0.00000 0 137 - 0.00000 - - 0s 0 0 0.00000 0 141 - 0.00000 - - 0s 0 0 0.00000 0 113 - 0.00000 - - 0s 0 0 infeasible 0 - 0.10000 - - 0s Cutting planes: Clique: 14 Zero half: 105 Explored 0 nodes (4503 simplex iterations) in 0.33 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: 7