current bounds on the number of colors: 0 -- 20 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 17:56:00 2012 Optimize a model with 1030 rows, 301 columns and 3230 nonzeros Presolve time: 0.00s Presolved: 1030 rows, 301 columns, 3230 nonzeros Variable types: 0 continuous, 301 integer (301 binary) Root relaxation: objective 0.000000e+00, 48 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 (94 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 -- 10 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 17:56:00 2012 Optimize a model with 525 rows, 201 columns and 1615 nonzeros Presolve time: 0.00s Presolved: 525 rows, 201 columns, 1615 nonzeros Variable types: 0 continuous, 201 integer (201 binary) Root relaxation: objective 0.000000e+00, 40 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 18 - 0.00000 - - 0s 0 0 0.00000 0 34 - 0.00000 - - 0s 0 0 0.00000 0 16 - 0.00000 - - 0s 0 0 0.00000 0 51 - 0.00000 - - 0s 0 0 0.00000 0 30 - 0.00000 - - 0s 0 0 0.00000 0 51 - 0.00000 - - 0s 0 0 0.00000 0 30 - 0.00000 - - 0s 0 0 0.00000 0 34 - 0.00000 - - 0s 0 0 0.00000 0 16 - 0.00000 - - 0s 0 0 0.00000 0 16 - 0.00000 - - 0s 0 0 infeasible 0 - infeasible - - 0s Cutting planes: Clique: 1 Explored 1 nodes (2340 simplex iterations) in 0.12 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: 5 -- 10 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 17:56:00 2012 Optimize a model with 727 rows, 241 columns and 2261 nonzeros Presolve time: 0.00s Presolved: 727 rows, 241 columns, 2261 nonzeros Variable types: 0 continuous, 241 integer (241 binary) Root relaxation: objective 0.000000e+00, 42 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 8 - 0.00000 - - 0s H 0 0 0.0000000 0.00000 0.0% - 0s Explored 0 nodes (189 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: 5 -- 7 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 17:56:00 2012 Optimize a model with 626 rows, 221 columns and 1938 nonzeros Presolve time: 0.00s Presolved: 626 rows, 221 columns, 1938 nonzeros Variable types: 0 continuous, 221 integer (221 binary) Root relaxation: objective 0.000000e+00, 40 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 14 - 0.00000 - - 0s H 0 0 0.0000000 0.00000 0.0% - 0s Explored 0 nodes (287 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: 6