current bounds on the number of colors: 0 -- 104 Gurobi 5.0.1 (linux64) logging started Fri Dec 14 18:25:27 2012 Optimize a model with 13208 rows, 5660 columns and 44720 nonzeros Presolve removed 1 rows and 52 columns Presolve time: 0.09s Presolved: 13207 rows, 5608 columns, 44668 nonzeros Variable types: 0 continuous, 5608 integer (5608 binary) Root relaxation: objective 0.000000e+00, 278 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 (442 simplex iterations) in 0.12 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 -- 52 Gurobi 5.0.1 (linux64) logging started Fri Dec 14 18:25:27 2012 Optimize a model with 6656 rows, 2956 columns and 22360 nonzeros Presolve removed 1 rows and 26 columns Presolve time: 0.03s Presolved: 6655 rows, 2930 columns, 22334 nonzeros Variable types: 0 continuous, 2930 integer (2930 binary) Root relaxation: objective 0.000000e+00, 247 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 (418 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 -- 26 Gurobi 5.0.1 (linux64) logging started Fri Dec 14 18:25:27 2012 Optimize a model with 3380 rows, 1604 columns and 11180 nonzeros Presolve removed 1 rows and 13 columns Presolve time: 0.01s Presolved: 3379 rows, 1591 columns, 11167 nonzeros Variable types: 0 continuous, 1591 integer (1591 binary) Root relaxation: objective 0.000000e+00, 214 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 (365 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 -- 13 Gurobi 5.0.1 (linux64) logging started Fri Dec 14 18:25:27 2012 Optimize a model with 1616 rows, 876 columns and 5160 nonzeros Presolve removed 1 rows and 6 columns Presolve time: 0.00s Presolved: 1615 rows, 870 columns, 5154 nonzeros Variable types: 0 continuous, 870 integer (870 binary) Root relaxation: objective 0.000000e+00, 257 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 (434 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 -- 6 Gurobi 5.0.1 (linux64) logging started Fri Dec 14 18:25:27 2012 Optimize a model with 860 rows, 564 columns and 2580 nonzeros Presolve removed 1 rows and 3 columns Presolve time: 0.00s Presolved: 859 rows, 561 columns, 2577 nonzeros Variable types: 0 continuous, 561 integer (561 binary) Root relaxation: objective 0.000000e+00, 267 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 0 167 - 0.00000 - - 0s 0 0 0.00000 0 136 - 0.00000 - - 0s 0 0 0.00000 0 184 - 0.00000 - - 0s 0 0 0.00000 0 184 - 0.00000 - - 0s 0 0 0.00000 0 176 - 0.00000 - - 0s 0 0 0.00000 0 166 - 0.00000 - - 0s 0 0 0.00000 0 164 - 0.00000 - - 0s 0 0 0.00000 0 191 - 0.00000 - - 0s 0 0 0.00000 0 198 - 0.00000 - - 0s 0 0 0.00000 0 198 - 0.00000 - - 0s 0 2 0.00000 0 195 - 0.00000 - - 0s Cutting planes: Zero half: 22 Explored 140 nodes (12002 simplex iterations) in 0.53 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 -- 6 Gurobi 5.0.1 (linux64) logging started Fri Dec 14 18:25:28 2012 Optimize a model with 1112 rows, 668 columns and 3440 nonzeros Presolve removed 1 rows and 4 columns Presolve time: 0.00s Presolved: 1111 rows, 664 columns, 3436 nonzeros Variable types: 0 continuous, 664 integer (664 binary) Root relaxation: objective 0.000000e+00, 260 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 (421 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