current bounds on the number of colors: 0 -- 113 Gurobi 5.0.1 (linux64) logging started Fri Dec 14 18:28:03 2012 Optimize a model with 17697 rows, 6642 columns and 59080 nonzeros Presolve removed 2 rows and 112 columns Presolve time: 0.12s Presolved: 17695 rows, 6530 columns, 58968 nonzeros Variable types: 0 continuous, 6530 integer (6530 binary) Root relaxation: objective 0.000000e+00, 301 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 (301 simplex iterations) in 0.14 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 -- 56 Gurobi 5.0.1 (linux64) logging started Fri Dec 14 18:28:04 2012 Optimize a model with 8905 rows, 3478 columns and 29540 nonzeros Presolve removed 2 rows and 56 columns Presolve time: 0.04s Presolved: 8903 rows, 3422 columns, 29484 nonzeros Variable types: 0 continuous, 3422 integer (3422 binary) Root relaxation: objective 0.000000e+00, 266 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 (446 simplex iterations) in 0.06 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 -- 28 Gurobi 5.0.1 (linux64) logging started Fri Dec 14 18:28:04 2012 Optimize a model with 4509 rows, 1896 columns and 14770 nonzeros Presolve removed 2 rows and 28 columns Presolve time: 0.02s Presolved: 4507 rows, 1868 columns, 14742 nonzeros Variable types: 0 continuous, 1868 integer (1868 binary) Root relaxation: objective 0.000000e+00, 234 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 (415 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 -- 14 Gurobi 5.0.1 (linux64) logging started Fri Dec 14 18:28:04 2012 Optimize a model with 2311 rows, 1105 columns and 7385 nonzeros Presolve removed 2 rows and 14 columns Presolve time: 0.01s Presolved: 2309 rows, 1091 columns, 7371 nonzeros Variable types: 0 continuous, 1091 integer (1091 binary) Root relaxation: objective 0.000000e+00, 255 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 (451 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 -- 7 Gurobi 5.0.1 (linux64) logging started Fri Dec 14 18:28:04 2012 Optimize a model with 1055 rows, 653 columns and 3165 nonzeros Presolve removed 2 rows and 6 columns Presolve time: 0.00s Presolved: 1053 rows, 647 columns, 3159 nonzeros Variable types: 0 continuous, 647 integer (647 binary) Root relaxation: objective 0.000000e+00, 269 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 0 208 - 0.00000 - - 0s 0 0 0.00000 0 200 - 0.00000 - - 0s 0 0 0.00000 0 204 - 0.00000 - - 0s 0 0 0.00000 0 208 - 0.00000 - - 0s 0 0 0.00000 0 194 - 0.00000 - - 0s 0 0 0.00000 0 246 - 0.00000 - - 0s 0 0 0.00000 0 214 - 0.00000 - - 0s 0 0 0.00000 0 263 - 0.00000 - - 0s 0 0 0.00000 0 242 - 0.00000 - - 0s 0 0 0.00000 0 262 - 0.00000 - - 0s 0 0 0.00000 0 244 - 0.00000 - - 0s 0 2 0.00000 0 244 - 0.00000 - - 0s Cutting planes: Zero half: 14 Explored 15 nodes (11215 simplex iterations) in 0.74 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: 3 -- 7 Gurobi 5.0.1 (linux64) logging started Fri Dec 14 18:28:05 2012 Optimize a model with 1683 rows, 879 columns and 5275 nonzeros Presolve removed 2 rows and 10 columns Presolve time: 0.00s Presolved: 1681 rows, 869 columns, 5265 nonzeros Variable types: 0 continuous, 869 integer (869 binary) Root relaxation: objective 0.000000e+00, 261 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 (464 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: 3 -- 5 Gurobi 5.0.1 (linux64) logging started Fri Dec 14 18:28:05 2012 Optimize a model with 1369 rows, 766 columns and 4220 nonzeros Presolve removed 2 rows and 8 columns Presolve time: 0.00s Presolved: 1367 rows, 758 columns, 4212 nonzeros Variable types: 0 continuous, 758 integer (758 binary) Root relaxation: objective 0.000000e+00, 277 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 (663 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% optimal solution found: number of colors: 4