current bounds on the number of colors: 0 -- 67 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 19:37:41 2012 Optimize a model with 7195 rows, 2427 columns and 23595 nonzeros Presolve time: 0.04s Presolved: 7195 rows, 2427 columns, 23595 nonzeros Variable types: 0 continuous, 2427 integer (2427 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 (274 simplex iterations) in 0.05 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 -- 33 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 19:37:41 2012 Optimize a model with 3523 rows, 1288 columns and 11440 nonzeros Presolve time: 0.01s Presolved: 3523 rows, 1288 columns, 11440 nonzeros Variable types: 0 continuous, 1288 integer (1288 binary) Root relaxation: objective 0.000000e+00, 143 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 (253 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 19:37:41 2012 Optimize a model with 1795 rows, 752 columns and 5720 nonzeros Presolve time: 0.01s Presolved: 1795 rows, 752 columns, 5720 nonzeros Variable types: 0 continuous, 752 integer (752 binary) Root relaxation: objective 0.000000e+00, 146 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 (258 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 -- 8 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 19:37:41 2012 Optimize a model with 931 rows, 484 columns and 2860 nonzeros Presolve time: 0.00s Presolved: 931 rows, 484 columns, 2860 nonzeros Variable types: 0 continuous, 484 integer (484 binary) Root relaxation: objective 0.000000e+00, 147 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 74 - 0.00000 - - 0s H 0 0 0.0000000 0.00000 0.0% - 0s Explored 0 nodes (589 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 -- 4 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 19:37:42 2012 Optimize a model with 499 rows, 350 columns and 1430 nonzeros Presolve removed 67 rows and 67 columns Presolve time: 0.00s Presolved: 432 rows, 283 columns, 1296 nonzeros Variable types: 0 continuous, 283 integer (283 binary) Root relaxation: objective 0.000000e+00, 68 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 67 - 0.00000 - - 0s 0 0 infeasible 0 - 0.10000 - - 0s Explored 0 nodes (266 simplex iterations) in 0.00 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 19:37:42 2012 Optimize a model with 715 rows, 417 columns and 2145 nonzeros Presolve time: 0.00s Presolved: 715 rows, 417 columns, 2145 nonzeros Variable types: 0 continuous, 417 integer (417 binary) Root relaxation: objective 0.000000e+00, 156 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 0 110 - 0.00000 - - 0s 0 0 0.00000 0 128 - 0.00000 - - 0s 0 0 0.00000 0 167 - 0.00000 - - 0s 0 0 0.00000 0 169 - 0.00000 - - 0s 0 0 0.00000 0 166 - 0.00000 - - 0s 0 0 0.00000 0 169 - 0.00000 - - 0s 0 0 infeasible 0 - 0.10000 - - 0s Cutting planes: Zero half: 149 Explored 0 nodes (3375 simplex iterations) in 0.19 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