current bounds on the number of colors: 0 -- 49 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 19:36:16 2012 Optimize a model with 3001 rows, 1299 columns and 10032 nonzeros Presolve removed 1 rows and 24 columns Presolve time: 0.01s Presolved: 3000 rows, 1275 columns, 10008 nonzeros Variable types: 0 continuous, 1275 integer (1275 binary) Root relaxation: objective 0.000000e+00, 118 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 (199 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 -- 24 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 19:36:17 2012 Optimize a model with 1525 rows, 711 columns and 5016 nonzeros Presolve removed 1 rows and 12 columns Presolve time: 0.01s Presolved: 1524 rows, 699 columns, 5004 nonzeros Variable types: 0 continuous, 699 integer (699 binary) Root relaxation: objective 0.000000e+00, 101 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 (172 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 19:36:17 2012 Optimize a model with 787 rows, 417 columns and 2508 nonzeros Presolve removed 1 rows and 6 columns Presolve time: 0.00s Presolved: 786 rows, 411 columns, 2502 nonzeros Variable types: 0 continuous, 411 integer (411 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 (182 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 19:36:17 2012 Optimize a model with 418 rows, 270 columns and 1254 nonzeros Presolve removed 1 rows and 3 columns Presolve time: 0.00s Presolved: 417 rows, 267 columns, 1251 nonzeros Variable types: 0 continuous, 267 integer (267 binary) Root relaxation: objective 0.000000e+00, 108 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 94 - 0.00000 - - 0s 0 0 0.00000 0 77 - 0.00000 - - 0s 0 0 0.00000 0 106 - 0.00000 - - 0s 0 0 0.00000 0 86 - 0.00000 - - 0s 0 0 0.00000 0 110 - 0.00000 - - 0s 0 0 0.00000 0 52 - 0.00000 - - 0s 0 0 0.00000 0 99 - 0.00000 - - 0s 0 0 0.00000 0 86 - 0.00000 - - 0s 0 0 0.00000 0 88 - 0.00000 - - 0s Cutting planes: Gomory: 1 Zero half: 5 Explored 0 nodes (2353 simplex iterations) in 0.13 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 19:36:17 2012 Optimize a model with 541 rows, 319 columns and 1672 nonzeros Presolve removed 1 rows and 4 columns Presolve time: 0.00s Presolved: 540 rows, 315 columns, 1668 nonzeros Variable types: 0 continuous, 315 integer (315 binary) Root relaxation: objective 0.000000e+00, 104 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 (183 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% optimal solution found: number of colors: 4