current bounds on the number of colors: 0 -- 75 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 19:38:48 2012 Optimize a model with 10509 rows, 3057 columns and 34077 nonzeros Presolve time: 0.05s Presolved: 10509 rows, 3057 columns, 34077 nonzeros Variable types: 0 continuous, 3057 integer (3057 binary) Root relaxation: objective 0.000000e+00, 199 iterations, 0.01 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 (341 simplex iterations) in 0.08 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 -- 37 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 19:38:49 2012 Optimize a model with 5151 rows, 1632 columns and 16578 nonzeros Presolve time: 0.02s Presolved: 5151 rows, 1632 columns, 16578 nonzeros Variable types: 0 continuous, 1632 integer (1632 binary) Root relaxation: objective 0.000000e+00, 168 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 (331 simplex iterations) in 0.03 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 -- 18 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 19:38:49 2012 Optimize a model with 2613 rows, 957 columns and 8289 nonzeros Presolve time: 0.01s Presolved: 2613 rows, 957 columns, 8289 nonzeros Variable types: 0 continuous, 957 integer (957 binary) Root relaxation: objective 0.000000e+00, 163 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 (286 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 -- 9 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 19:38:49 2012 Optimize a model with 1203 rows, 582 columns and 3684 nonzeros Presolve time: 0.00s Presolved: 1203 rows, 582 columns, 3684 nonzeros Variable types: 0 continuous, 582 integer (582 binary) Root relaxation: objective 0.000000e+00, 169 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 0 128 - 0.00000 - - 0s 0 0 0.00000 0 138 - 0.00000 - - 0s 0 0 0.00000 0 138 - 0.00000 - - 0s 0 0 0.00000 0 161 - 0.00000 - - 0s 0 0 0.00000 0 158 - 0.00000 - - 0s 0 0 0.00000 0 94 - 0.00000 - - 0s * 0 0 0 0.0000000 0.00000 0.0% - 0s Cutting planes: Clique: 2 Zero half: 10 Explored 0 nodes (5068 simplex iterations) in 0.29 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 -- 4 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 19:38:49 2012 Optimize a model with 639 rows, 432 columns and 1842 nonzeros Presolve removed 75 rows and 75 columns Presolve time: 0.00s Presolved: 564 rows, 357 columns, 1692 nonzeros Variable types: 0 continuous, 357 integer (357 binary) Root relaxation: objective 0.000000e+00, 83 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 75 - 0.00000 - - 0s 0 0 infeasible 0 - 0.10000 - - 0s Explored 0 nodes (331 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: 2 -- 4 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 19:38:49 2012 Optimize a model with 921 rows, 507 columns and 2763 nonzeros Presolve time: 0.00s Presolved: 921 rows, 507 columns, 2763 nonzeros Variable types: 0 continuous, 507 integer (507 binary) Root relaxation: objective 0.000000e+00, 175 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 0 108 - 0.00000 - - 0s 0 0 0.00000 0 165 - 0.00000 - - 0s 0 0 infeasible 0 - 0.10000 - - 0s Explored 0 nodes (1715 simplex iterations) in 0.09 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: 4