current bounds on the number of colors: 0 -- 44 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 18:03:27 2012 Optimize a model with 10692 rows, 1452 columns and 32912 nonzeros Presolve time: 0.04s Presolved: 10692 rows, 1452 columns, 32912 nonzeros Variable types: 0 continuous, 1452 integer (1452 binary) Root relaxation: objective 0.000000e+00, 91 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 (218 simplex iterations) in 0.06 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 -- 22 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 18:03:27 2012 Optimize a model with 5368 rows, 968 columns and 16456 nonzeros Presolve time: 0.02s Presolved: 5368 rows, 968 columns, 16456 nonzeros Variable types: 0 continuous, 968 integer (968 binary) Root relaxation: objective 0.000000e+00, 94 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 (439 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 -- 11 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 18:03:27 2012 Optimize a model with 2464 rows, 704 columns and 7480 nonzeros Presolve time: 0.01s Presolved: 2464 rows, 704 columns, 7480 nonzeros Variable types: 0 continuous, 704 integer (704 binary) Root relaxation: objective 0.000000e+00, 90 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 66 - 0.00000 - - 0s 0 0 0.00000 0 76 - 0.00000 - - 0s 0 0 infeasible 0 - 0.10000 - - 0s Explored 0 nodes (1384 simplex iterations) in 0.14 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: 5 -- 11 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 18:03:28 2012 Optimize a model with 3916 rows, 836 columns and 11968 nonzeros Presolve time: 0.01s Presolved: 3916 rows, 836 columns, 11968 nonzeros Variable types: 0 continuous, 836 integer (836 binary) Root relaxation: objective 0.000000e+00, 88 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 40 - 0.00000 - - 0s 0 0 0.00000 0 68 - 0.00000 - - 0s 0 0 0.00000 0 115 - 0.00000 - - 0s 0 0 0.00000 0 141 - 0.00000 - - 0s 0 0 0.00000 0 120 - 0.00000 - - 0s 0 0 0.00000 0 180 - 0.00000 - - 1s 0 0 0.00000 0 144 - 0.00000 - - 1s 0 0 0.00000 0 172 - 0.00000 - - 1s 0 0 0.00000 0 157 - 0.00000 - - 2s 0 0 0.00000 0 173 - 0.00000 - - 2s 0 0 0.00000 0 173 - 0.00000 - - 2s 0 2 0.00000 0 173 - 0.00000 - - 2s Cutting planes: Clique: 63 Zero half: 7 Explored 69 nodes (31249 simplex iterations) in 3.72 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: 8 -- 11 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 18:03:32 2012 Optimize a model with 4400 rows, 880 columns and 13464 nonzeros Presolve time: 0.01s Presolved: 4400 rows, 880 columns, 13464 nonzeros Variable types: 0 continuous, 880 integer (880 binary) Root relaxation: objective 0.000000e+00, 93 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 48 - 0.00000 - - 0s H 0 0 0.0000000 0.00000 0.0% - 0s Explored 0 nodes (744 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% optimal solution found: number of colors: 9