current bounds on the number of colors: 0 -- 41 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 18:00:24 2012 Optimize a model with 7901 rows, 1213 columns and 24400 nonzeros Presolve time: 0.03s Presolved: 7901 rows, 1213 columns, 24400 nonzeros Variable types: 0 continuous, 1213 integer (1213 binary) Root relaxation: objective 0.000000e+00, 92 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 (330 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 -- 20 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 18:00:24 2012 Optimize a model with 3971 rows, 803 columns and 12200 nonzeros Presolve time: 0.01s Presolved: 3971 rows, 803 columns, 12200 nonzeros Variable types: 0 continuous, 803 integer (803 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 17 - 0.00000 - - 0s H 0 0 0.0000000 0.00000 0.0% - 0s Explored 0 nodes (821 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 -- 10 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 18:00:24 2012 Optimize a model with 2006 rows, 598 columns and 6100 nonzeros Presolve time: 0.00s Presolved: 2006 rows, 598 columns, 6100 nonzeros Variable types: 0 continuous, 598 integer (598 binary) Root relaxation: objective 0.000000e+00, 82 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 58 - 0.00000 - - 0s 0 0 0.00000 0 48 - 0.00000 - - 0s 0 0 infeasible 0 - 0.10000 - - 0s Explored 0 nodes (1596 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: 5 -- 10 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 18:00:24 2012 Optimize a model with 2792 rows, 680 columns and 8540 nonzeros Presolve time: 0.01s Presolved: 2792 rows, 680 columns, 8540 nonzeros Variable types: 0 continuous, 680 integer (680 binary) Root relaxation: objective 0.000000e+00, 83 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 42 - 0.00000 - - 0s 0 0 0.00000 0 132 - 0.00000 - - 0s 0 0 0.00000 0 156 - 0.00000 - - 0s 0 0 0.00000 0 113 - 0.00000 - - 0s 0 0 0.00000 0 90 - 0.00000 - - 0s 0 0 0.00000 0 112 - 0.00000 - - 1s 0 0 0.00000 0 107 - 0.00000 - - 1s 0 0 0.00000 0 144 - 0.00000 - - 1s 0 0 0.00000 0 151 - 0.00000 - - 1s 0 0 0.00000 0 151 - 0.00000 - - 1s 0 2 0.00000 0 151 - 0.00000 - - 2s Cutting planes: Clique: 41 Zero half: 21 Explored 13 nodes (20480 simplex iterations) in 2.12 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: 7 -- 10 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 18:00:27 2012 Optimize a model with 3185 rows, 721 columns and 9760 nonzeros Presolve time: 0.01s Presolved: 3185 rows, 721 columns, 9760 nonzeros Variable types: 0 continuous, 721 integer (721 binary) Root relaxation: objective 0.000000e+00, 84 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 45 - 0.00000 - - 0s H 0 0 0.0000000 0.00000 0.0% - 0s Explored 0 nodes (949 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: 8