current bounds on the number of colors: 0 -- 71 Gurobi 5.0.1 (linux64) logging started Fri Dec 14 18:20:47 2012 Optimize a model with 5426 rows, 2638 columns and 18550 nonzeros Presolve removed 1 rows and 35 columns Presolve time: 0.03s Presolved: 5425 rows, 2603 columns, 18515 nonzeros Variable types: 0 continuous, 2603 integer (2603 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 (168 simplex iterations) in 0.04 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 -- 35 Gurobi 5.0.1 (linux64) logging started Fri Dec 14 18:20:47 2012 Optimize a model with 2672 rows, 1360 columns and 9010 nonzeros Presolve removed 1 rows and 17 columns Presolve time: 0.01s Presolved: 2671 rows, 1343 columns, 8993 nonzeros Variable types: 0 continuous, 1343 integer (1343 binary) Root relaxation: objective 0.000000e+00, 152 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 (252 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 -- 17 Gurobi 5.0.1 (linux64) logging started Fri Dec 14 18:20:47 2012 Optimize a model with 1295 rows, 721 columns and 4240 nonzeros Presolve removed 1 rows and 8 columns Presolve time: 0.00s Presolved: 1294 rows, 713 columns, 4232 nonzeros Variable types: 0 continuous, 713 integer (713 binary) Root relaxation: objective 0.000000e+00, 165 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 (271 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 Fri Dec 14 18:20:47 2012 Optimize a model with 683 rows, 437 columns and 2120 nonzeros Presolve removed 1 rows and 4 columns Presolve time: 0.00s Presolved: 682 rows, 433 columns, 2116 nonzeros Variable types: 0 continuous, 433 integer (433 binary) Root relaxation: objective 0.000000e+00, 162 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 (359 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 -- 4 Gurobi 5.0.1 (linux64) logging started Fri Dec 14 18:20:47 2012 Optimize a model with 377 rows, 295 columns and 1060 nonzeros Presolve removed 71 rows and 72 columns Presolve time: 0.00s Presolved: 306 rows, 223 columns, 918 nonzeros Variable types: 0 continuous, 223 integer (223 binary) Root relaxation: objective 0.000000e+00, 73 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 70 - 0.00000 - - 0s 0 0 infeasible 0 - 0.10000 - - 0s Explored 0 nodes (288 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 Fri Dec 14 18:20:47 2012 Optimize a model with 530 rows, 366 columns and 1590 nonzeros Presolve removed 1 rows and 3 columns Presolve time: 0.00s Presolved: 529 rows, 363 columns, 1587 nonzeros Variable types: 0 continuous, 363 integer (363 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 0.00000 0 108 - 0.00000 - - 0s 0 0 0.00000 0 108 - 0.00000 - - 0s 0 0 0.00000 0 112 - 0.00000 - - 0s 0 0 0.00000 0 123 - 0.00000 - - 0s 0 0 0.00000 0 112 - 0.00000 - - 0s 0 0 0.00000 0 118 - 0.00000 - - 0s 0 0 0.00000 0 117 - 0.00000 - - 0s 0 0 0.00000 0 109 - 0.00000 - - 0s 0 0 0.00000 0 115 - 0.00000 - - 0s 0 0 0.00000 0 76 - 0.00000 - - 0s 0 0 0.00000 0 86 - 0.00000 - - 0s 0 0 0.00000 0 86 - 0.00000 - - 0s 0 2 0.00000 0 84 - 0.00000 - - 0s Cutting planes: Zero half: 3 Explored 6 nodes (4927 simplex iterations) in 0.23 seconds Thread count was 1 (of 16 available processors) Model objective exceeds cutoff Best objective -, best bound -, gap - optimal solution found: number of colors: 4