current bounds on the number of colors: 0 -- 59 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 19:37:00 2012 Optimize a model with 4815 rows, 1875 columns and 15979 nonzeros Presolve time: 0.02s Presolved: 4815 rows, 1875 columns, 15979 nonzeros Variable types: 0 continuous, 1875 integer (1875 binary) Root relaxation: objective 0.000000e+00, 141 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 (272 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 -- 29 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 19:37:00 2012 Optimize a model with 2355 rows, 990 columns and 7714 nonzeros Presolve time: 0.01s Presolved: 2355 rows, 990 columns, 7714 nonzeros Variable types: 0 continuous, 990 integer (990 binary) Root relaxation: objective 0.000000e+00, 124 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 0.01 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 -- 14 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 19:37:00 2012 Optimize a model with 1207 rows, 577 columns and 3857 nonzeros Presolve time: 0.00s Presolved: 1207 rows, 577 columns, 3857 nonzeros Variable types: 0 continuous, 577 integer (577 binary) Root relaxation: objective 0.000000e+00, 129 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 (233 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 Thu Dec 13 19:37:00 2012 Optimize a model with 551 rows, 341 columns and 1653 nonzeros Presolve time: 0.00s Presolved: 551 rows, 341 columns, 1653 nonzeros Variable types: 0 continuous, 341 integer (341 binary) Root relaxation: objective 0.000000e+00, 133 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 0 106 - 0.00000 - - 0s 0 0 0.00000 0 94 - 0.00000 - - 0s 0 0 0.00000 0 107 - 0.00000 - - 0s 0 0 0.00000 0 146 - 0.00000 - - 0s 0 0 0.00000 0 108 - 0.00000 - - 0s 0 0 0.00000 0 115 - 0.00000 - - 0s 0 0 0.00000 0 116 - 0.00000 - - 0s 0 0 0.00000 0 135 - 0.00000 - - 0s 0 0 0.00000 0 135 - 0.00000 - - 0s 0 2 0.00000 0 135 - 0.00000 - - 0s Cutting planes: Zero half: 11 Explored 5 nodes (4159 simplex iterations) in 0.19 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 Thu Dec 13 19:37:00 2012 Optimize a model with 879 rows, 459 columns and 2755 nonzeros Presolve time: 0.00s Presolved: 879 rows, 459 columns, 2755 nonzeros Variable types: 0 continuous, 459 integer (459 binary) Root relaxation: objective 0.000000e+00, 130 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 (324 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 Thu Dec 13 19:37:00 2012 Optimize a model with 715 rows, 400 columns and 2204 nonzeros Presolve time: 0.00s Presolved: 715 rows, 400 columns, 2204 nonzeros Variable types: 0 continuous, 400 integer (400 binary) Root relaxation: objective 0.000000e+00, 139 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 (265 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