current bounds on the number of colors: 0 -- 88 Gurobi 5.0.1 (linux64) logging started Fri Dec 14 18:22:26 2012 Optimize a model with 9460 rows, 4085 columns and 31988 nonzeros Presolve removed 1 rows and 44 columns Presolve time: 0.06s Presolved: 9459 rows, 4041 columns, 31944 nonzeros Variable types: 0 continuous, 4041 integer (4041 binary) Root relaxation: objective 0.000000e+00, 219 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 (340 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 -- 44 Gurobi 5.0.1 (linux64) logging started Fri Dec 14 18:22:26 2012 Optimize a model with 4774 rows, 2149 columns and 15994 nonzeros Presolve removed 1 rows and 22 columns Presolve time: 0.02s Presolved: 4773 rows, 2127 columns, 15972 nonzeros Variable types: 0 continuous, 2127 integer (2127 binary) Root relaxation: objective 0.000000e+00, 216 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 (216 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 -- 22 Gurobi 5.0.1 (linux64) logging started Fri Dec 14 18:22:26 2012 Optimize a model with 2431 rows, 1181 columns and 7997 nonzeros Presolve removed 1 rows and 11 columns Presolve time: 0.01s Presolved: 2430 rows, 1170 columns, 7986 nonzeros Variable types: 0 continuous, 1170 integer (1170 binary) Root relaxation: objective 0.000000e+00, 180 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 (303 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 Fri Dec 14 18:22:27 2012 Optimize a model with 1153 rows, 653 columns and 3635 nonzeros Presolve removed 1 rows and 5 columns Presolve time: 0.00s Presolved: 1152 rows, 648 columns, 3630 nonzeros Variable types: 0 continuous, 648 integer (648 binary) Root relaxation: objective 0.000000e+00, 217 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 (341 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 -- 5 Gurobi 5.0.1 (linux64) logging started Fri Dec 14 18:22:27 2012 Optimize a model with 514 rows, 389 columns and 1454 nonzeros Presolve removed 88 rows and 89 columns Presolve time: 0.00s Presolved: 426 rows, 300 columns, 1278 nonzeros Variable types: 0 continuous, 300 integer (300 binary) Root relaxation: objective 0.000000e+00, 96 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 87 - 0.00000 - - 0s Explored 0 nodes (362 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 -- 5 Gurobi 5.0.1 (linux64) logging started Fri Dec 14 18:22:27 2012 Optimize a model with 727 rows, 477 columns and 2181 nonzeros Presolve removed 1 rows and 3 columns Presolve time: 0.00s Presolved: 726 rows, 474 columns, 2178 nonzeros Variable types: 0 continuous, 474 integer (474 binary) Root relaxation: objective 0.000000e+00, 203 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 0 156 - 0.00000 - - 0s 0 0 0.00000 0 160 - 0.00000 - - 0s 0 0 0.00000 0 144 - 0.00000 - - 0s 0 0 0.00000 0 146 - 0.00000 - - 0s 0 0 0.00000 0 137 - 0.00000 - - 0s 0 0 0.00000 0 130 - 0.00000 - - 0s 0 0 0.00000 0 128 - 0.00000 - - 0s 0 0 0.00000 0 120 - 0.00000 - - 0s 0 0 0.00000 0 114 - 0.00000 - - 0s 0 0 0.00000 0 112 - 0.00000 - - 0s 0 0 0.00000 0 115 - 0.00000 - - 0s 0 0 0.00000 0 134 - 0.00000 - - 0s 0 0 0.00000 0 127 - 0.00000 - - 0s 0 0 0.00000 0 175 - 0.00000 - - 0s 0 0 0.00000 0 167 - 0.00000 - - 0s 0 2 0.00000 0 167 - 0.00000 - - 0s Cutting planes: Zero half: 16 Explored 11 nodes (9258 simplex iterations) in 0.42 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 -- 5 Gurobi 5.0.1 (linux64) logging started Fri Dec 14 18:22:27 2012 Optimize a model with 940 rows, 565 columns and 2908 nonzeros Presolve removed 1 rows and 4 columns Presolve time: 0.00s Presolved: 939 rows, 561 columns, 2904 nonzeros Variable types: 0 continuous, 561 integer (561 binary) Root relaxation: objective 0.000000e+00, 204 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 (382 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% optimal solution found: number of colors: 4