current bounds on the number of colors: 0 -- 62 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 19:37:14 2012 Optimize a model with 5549 rows, 2099 columns and 18383 nonzeros Presolve time: 0.03s Presolved: 5549 rows, 2099 columns, 18383 nonzeros Variable types: 0 continuous, 2099 integer (2099 binary) Root relaxation: objective 0.000000e+00, 154 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 (269 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 -- 31 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 19:37:14 2012 Optimize a model with 2717 rows, 1107 columns and 8895 nonzeros Presolve time: 0.01s Presolved: 2717 rows, 1107 columns, 8895 nonzeros Variable types: 0 continuous, 1107 integer (1107 binary) Root relaxation: objective 0.000000e+00, 128 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 (241 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 -- 15 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 19:37:14 2012 Optimize a model with 1301 rows, 611 columns and 4151 nonzeros Presolve time: 0.00s Presolved: 1301 rows, 611 columns, 4151 nonzeros Variable types: 0 continuous, 611 integer (611 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 (224 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 19:37:14 2012 Optimize a model with 593 rows, 363 columns and 1779 nonzeros Presolve time: 0.00s Presolved: 593 rows, 363 columns, 1779 nonzeros Variable types: 0 continuous, 363 integer (363 binary) Root relaxation: objective 0.000000e+00, 153 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 0 120 - 0.00000 - - 0s 0 0 0.00000 0 116 - 0.00000 - - 0s 0 0 0.00000 0 132 - 0.00000 - - 0s 0 0 0.00000 0 148 - 0.00000 - - 0s 0 0 infeasible 0 - 0.10000 - - 0s Cutting planes: Gomory: 2 Zero half: 115 Explored 0 nodes (1973 simplex iterations) in 0.09 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: 3 -- 7 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 19:37:14 2012 Optimize a model with 947 rows, 487 columns and 2965 nonzeros Presolve time: 0.00s Presolved: 947 rows, 487 columns, 2965 nonzeros Variable types: 0 continuous, 487 integer (487 binary) Root relaxation: objective 0.000000e+00, 135 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 (370 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 19:37:14 2012 Optimize a model with 770 rows, 425 columns and 2372 nonzeros Presolve time: 0.00s Presolved: 770 rows, 425 columns, 2372 nonzeros Variable types: 0 continuous, 425 integer (425 binary) Root relaxation: objective 0.000000e+00, 137 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 (540 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