current bounds on the number of colors: 0 -- 33 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 17:57:10 2012 Optimize a model with 4257 rows, 792 columns and 13200 nonzeros Presolve time: 0.01s Presolved: 4257 rows, 792 columns, 13200 nonzeros Variable types: 0 continuous, 792 integer (792 binary) Root relaxation: objective 0.000000e+00, 80 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 (173 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 -- 16 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 17:57:10 2012 Optimize a model with 2145 rows, 528 columns and 6600 nonzeros Presolve time: 0.01s Presolved: 2145 rows, 528 columns, 6600 nonzeros Variable types: 0 continuous, 528 integer (528 binary) Root relaxation: objective 0.000000e+00, 75 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 20 - 0.00000 - - 0s * 0 0 0 0.0000000 0.00000 0.0% - 0s Cutting planes: Gomory: 1 Clique: 7 MIR: 1 Zero half: 26 Explored 0 nodes (784 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 -- 8 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 17:57:10 2012 Optimize a model with 1089 rows, 396 columns and 3300 nonzeros Presolve time: 0.00s Presolved: 1089 rows, 396 columns, 3300 nonzeros Variable types: 0 continuous, 396 integer (396 binary) Root relaxation: objective 0.000000e+00, 66 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 44 - 0.00000 - - 0s 0 0 infeasible 0 - 0.10000 - - 0s Explored 0 nodes (1085 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: 4 -- 8 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 17:57:10 2012 Optimize a model with 1617 rows, 462 columns and 4950 nonzeros Presolve time: 0.00s Presolved: 1617 rows, 462 columns, 4950 nonzeros Variable types: 0 continuous, 462 integer (462 binary) Root relaxation: objective 0.000000e+00, 66 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 28 - 0.00000 - - 0s 0 0 infeasible 0 - 0.10000 - - 0s Explored 0 nodes (1608 simplex iterations) in 0.10 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: 6 -- 8 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 17:57:10 2012 Optimize a model with 1881 rows, 495 columns and 5775 nonzeros Presolve time: 0.00s Presolved: 1881 rows, 495 columns, 5775 nonzeros Variable types: 0 continuous, 495 integer (495 binary) Root relaxation: objective 0.000000e+00, 67 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 44 - 0.00000 - - 0s 0 0 0.00000 0 22 - 0.00000 - - 0s 0 0 0.00000 0 18 - 0.00000 - - 0s 0 0 0.00000 0 101 - 0.00000 - - 0s 0 0 0.00000 0 106 - 0.00000 - - 0s 0 0 0.00000 0 85 - 0.00000 - - 0s 0 0 0.00000 0 92 - 0.00000 - - 0s 0 0 0.00000 0 92 - 0.00000 - - 0s 0 2 0.00000 0 92 - 0.00000 - - 0s Cutting planes: Clique: 13 Zero half: 5 Explored 14 nodes (7799 simplex iterations) in 0.81 seconds Thread count was 1 (of 16 available processors) Model objective exceeds cutoff Best objective -, best bound -, gap - optimal solution found: number of colors: 8