current bounds on the number of colors: 0 -- 29 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 17:56:32 2012 Optimize a model with 2815 rows, 605 columns and 8764 nonzeros Presolve time: 0.01s Presolved: 2815 rows, 605 columns, 8764 nonzeros Variable types: 0 continuous, 605 integer (605 binary) Root relaxation: objective 0.000000e+00, 74 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 (147 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 -- 14 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 17:56:32 2012 Optimize a model with 1422 rows, 402 columns and 4382 nonzeros Presolve time: 0.00s Presolved: 1422 rows, 402 columns, 4382 nonzeros Variable types: 0 continuous, 402 integer (402 binary) Root relaxation: objective 0.000000e+00, 59 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 24 - 0.00000 - - 0s H 0 0 0.0000000 0.00000 0.0% - 0s Explored 0 nodes (411 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 -- 7 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 17:56:32 2012 Optimize a model with 626 rows, 286 columns and 1878 nonzeros Presolve time: 0.00s Presolved: 626 rows, 286 columns, 1878 nonzeros Variable types: 0 continuous, 286 integer (286 binary) Root relaxation: objective 0.000000e+00, 58 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: 1 Clique: 133 Zero half: 161 Explored 0 nodes (216 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 17:56:32 2012 Optimize a model with 1024 rows, 344 columns and 3130 nonzeros Presolve time: 0.00s Presolved: 1024 rows, 344 columns, 3130 nonzeros Variable types: 0 continuous, 344 integer (344 binary) Root relaxation: objective 0.000000e+00, 59 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 42 - 0.00000 - - 0s 0 0 0.00000 0 67 - 0.00000 - - 0s 0 0 infeasible 0 - 0.10000 - - 0s Explored 0 nodes (1032 simplex iterations) in 0.06 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 17:56:32 2012 Optimize a model with 1223 rows, 373 columns and 3756 nonzeros Presolve time: 0.00s Presolved: 1223 rows, 373 columns, 3756 nonzeros Variable types: 0 continuous, 373 integer (373 binary) Root relaxation: objective 0.000000e+00, 58 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 34 - 0.00000 - - 0s 0 0 0.00000 0 59 - 0.00000 - - 0s 0 0 0.00000 0 106 - 0.00000 - - 0s 0 0 0.00000 0 104 - 0.00000 - - 0s 0 0 0.00000 0 86 - 0.00000 - - 0s 0 0 0.00000 0 93 - 0.00000 - - 0s 0 0 0.00000 0 101 - 0.00000 - - 0s 0 0 0.00000 0 45 - 0.00000 - - 0s 0 2 0.00000 0 45 - 0.00000 - - 0s Cutting planes: Clique: 4 Zero half: 18 Explored 7 nodes (7205 simplex iterations) in 0.63 seconds Thread count was 1 (of 16 available processors) Model objective exceeds cutoff Best objective -, best bound -, gap - optimal solution found: number of colors: 7