current bounds on the number of colors: 0 -- 22 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 17:56:03 2012 Optimize a model with 1309 rows, 359 columns and 4103 nonzeros Presolve time: 0.00s Presolved: 1309 rows, 359 columns, 4103 nonzeros Variable types: 0 continuous, 359 integer (359 binary) Root relaxation: objective 0.000000e+00, 54 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 -- 11 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 17:56:03 2012 Optimize a model with 607 rows, 227 columns and 1865 nonzeros Presolve time: 0.00s Presolved: 607 rows, 227 columns, 1865 nonzeros Variable types: 0 continuous, 227 integer (227 binary) Root relaxation: objective 0.000000e+00, 49 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 26 - 0.00000 - - 0s 0 0 0.00000 0 42 - 0.00000 - - 0s 0 0 0.00000 0 16 - 0.00000 - - 0s 0 0 0.00000 0 47 - 0.00000 - - 0s 0 0 0.00000 0 22 - 0.00000 - - 0s 0 0 0.00000 0 52 - 0.00000 - - 0s 0 0 0.00000 0 38 - 0.00000 - - 0s 0 0 0.00000 0 30 - 0.00000 - - 0s 0 0 0.00000 0 46 - 0.00000 - - 0s 0 0 0.00000 0 49 - 0.00000 - - 0s 0 0 0.00000 0 49 - 0.00000 - - 0s 0 2 0.00000 0 49 - 0.00000 - - 0s Cutting planes: Clique: 6 Zero half: 3 Explored 5 nodes (2963 simplex iterations) in 0.16 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: 5 -- 11 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 17:56:03 2012 Optimize a model with 958 rows, 293 columns and 2984 nonzeros Presolve time: 0.00s Presolved: 958 rows, 293 columns, 2984 nonzeros Variable types: 0 continuous, 293 integer (293 binary) Root relaxation: objective 0.000000e+00, 49 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 (183 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: 5 -- 8 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 17:56:03 2012 Optimize a model with 724 rows, 249 columns and 2238 nonzeros Presolve time: 0.00s Presolved: 724 rows, 249 columns, 2238 nonzeros Variable types: 0 continuous, 249 integer (249 binary) Root relaxation: objective 0.000000e+00, 52 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 (128 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: 6