current bounds on the number of colors: 0 -- 143 Gurobi 5.0.1 (linux64) logging started Fri Dec 14 18:41:31 2012 Optimize a model with 37134 rows, 10674 columns and 121126 nonzeros Presolve time: 0.15s Presolved: 37134 rows, 10674 columns, 121126 nonzeros Variable types: 0 continuous, 10674 integer (10674 binary) Root relaxation: objective 0.000000e+00, 481 iterations, 0.03 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 (481 simplex iterations) in 0.19 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 -- 71 Gurobi 5.0.1 (linux64) logging started Fri Dec 14 18:41:31 2012 Optimize a model with 18378 rows, 5526 columns and 59710 nonzeros Presolve time: 0.09s Presolved: 18378 rows, 5526 columns, 59710 nonzeros Variable types: 0 continuous, 5526 integer (5526 binary) Root relaxation: objective 0.000000e+00, 383 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 (660 simplex iterations) in 0.13 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 -- 35 Gurobi 5.0.1 (linux64) logging started Fri Dec 14 18:41:32 2012 Optimize a model with 9000 rows, 2952 columns and 29002 nonzeros Presolve time: 0.03s Presolved: 9000 rows, 2952 columns, 29002 nonzeros Variable types: 0 continuous, 2952 integer (2952 binary) Root relaxation: objective 0.000000e+00, 296 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 (530 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 -- 17 Gurobi 5.0.1 (linux64) logging started Fri Dec 14 18:41:32 2012 Optimize a model with 4311 rows, 1665 columns and 13648 nonzeros Presolve time: 0.01s Presolved: 4311 rows, 1665 columns, 13648 nonzeros Variable types: 0 continuous, 1665 integer (1665 binary) Root relaxation: objective 0.000000e+00, 312 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 (538 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 -- 8 Gurobi 5.0.1 (linux64) logging started Fri Dec 14 18:41:32 2012 Optimize a model with 2227 rows, 1093 columns and 6824 nonzeros Presolve time: 0.01s Presolved: 2227 rows, 1093 columns, 6824 nonzeros Variable types: 0 continuous, 1093 integer (1093 binary) Root relaxation: objective 0.000000e+00, 353 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 0 252 - 0.00000 - - 0s 0 0 0.00000 0 238 - 0.00000 - - 0s Cutting planes: Clique: 3 Zero half: 1 Explored 0 nodes (3132 simplex iterations) in 0.17 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 -- 4 Gurobi 5.0.1 (linux64) logging started Fri Dec 14 18:41:32 2012 Optimize a model with 1185 rows, 807 columns and 3412 nonzeros Presolve removed 143 rows and 143 columns Presolve time: 0.00s Presolved: 1042 rows, 664 columns, 3126 nonzeros Variable types: 0 continuous, 664 integer (664 binary) Root relaxation: objective 0.000000e+00, 151 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 0 143 - 0.00000 - - 0s 0 0 infeasible 0 - 0.10000 - - 0s Explored 0 nodes (603 simplex iterations) in 0.01 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: 2 -- 4 Gurobi 5.0.1 (linux64) logging started Fri Dec 14 18:41:32 2012 Optimize a model with 1706 rows, 950 columns and 5118 nonzeros Presolve time: 0.00s Presolved: 1706 rows, 950 columns, 5118 nonzeros Variable types: 0 continuous, 950 integer (950 binary) Root relaxation: objective 0.000000e+00, 335 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 0 284 - 0.00000 - - 0s 0 0 0.00000 0 272 - 0.00000 - - 0s 0 0 0.00000 0 282 - 0.00000 - - 0s 0 0 0.00000 0 382 - 0.00000 - - 0s 0 0 0.00000 0 276 - 0.00000 - - 0s 0 0 0.00000 0 313 - 0.00000 - - 0s 0 0 0.00000 0 333 - 0.00000 - - 1s 0 0 0.00000 0 373 - 0.00000 - - 1s 0 0 0.00000 0 371 - 0.00000 - - 1s 0 2 0.00000 0 355 - 0.00000 - - 1s Cutting planes: Gomory: 1 Zero half: 35 Explored 7 nodes (16551 simplex iterations) in 1.63 seconds Thread count was 1 (of 16 available processors) Model objective exceeds cutoff Best objective -, best bound -, gap - optimal solution found: number of colors: 4