current bounds on the number of colors: 0 -- 51 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 19:36:22 2012 Optimize a model with 3001 rows, 1393 columns and 10125 nonzeros Presolve removed 1 rows and 25 columns Presolve time: 0.01s Presolved: 3000 rows, 1368 columns, 10100 nonzeros Variable types: 0 continuous, 1368 integer (1368 binary) Root relaxation: objective 0.000000e+00, 115 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 (115 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 -- 25 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 19:36:22 2012 Optimize a model with 1467 rows, 730 columns and 4860 nonzeros Presolve removed 1 rows and 12 columns Presolve time: 0.01s Presolved: 1466 rows, 718 columns, 4848 nonzeros Variable types: 0 continuous, 718 integer (718 binary) Root relaxation: objective 0.000000e+00, 107 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 (196 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 -- 12 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 19:36:23 2012 Optimize a model with 759 rows, 424 columns and 2430 nonzeros Presolve removed 1 rows and 6 columns Presolve time: 0.00s Presolved: 758 rows, 418 columns, 2424 nonzeros Variable types: 0 continuous, 418 integer (418 binary) Root relaxation: objective 0.000000e+00, 120 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 (190 simplex iterations) in 0.00 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 Thu Dec 13 19:36:23 2012 Optimize a model with 405 rows, 271 columns and 1215 nonzeros Presolve removed 1 rows and 3 columns Presolve time: 0.00s Presolved: 404 rows, 268 columns, 1212 nonzeros Variable types: 0 continuous, 268 integer (268 binary) Root relaxation: objective 0.000000e+00, 109 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 93 - 0.00000 - - 0s 0 0 0.00000 0 84 - 0.00000 - - 0s 0 0 infeasible 0 - 0.10000 - - 0s Explored 0 nodes (674 simplex iterations) in 0.02 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 -- 6 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 19:36:23 2012 Optimize a model with 523 rows, 322 columns and 1620 nonzeros Presolve removed 1 rows and 4 columns Presolve time: 0.00s Presolved: 522 rows, 318 columns, 1616 nonzeros Variable types: 0 continuous, 318 integer (318 binary) Root relaxation: objective 0.000000e+00, 120 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 (369 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