current bounds on the number of colors: 0 -- 64 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 19:37:23 2012 Optimize a model with 6496 rows, 2249 columns and 21344 nonzeros Presolve time: 0.03s Presolved: 6496 rows, 2249 columns, 21344 nonzeros Variable types: 0 continuous, 2249 integer (2249 binary) Root relaxation: objective 0.000000e+00, 148 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 (288 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 -- 32 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 19:37:23 2012 Optimize a model with 3280 rows, 1225 columns and 10672 nonzeros Presolve time: 0.01s Presolved: 3280 rows, 1225 columns, 10672 nonzeros Variable types: 0 continuous, 1225 integer (1225 binary) Root relaxation: objective 0.000000e+00, 132 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 (234 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 -- 16 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 19:37:23 2012 Optimize a model with 1672 rows, 713 columns and 5336 nonzeros Presolve time: 0.00s Presolved: 1672 rows, 713 columns, 5336 nonzeros Variable types: 0 continuous, 713 integer (713 binary) Root relaxation: objective 0.000000e+00, 147 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 (254 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 -- 8 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 19:37:23 2012 Optimize a model with 868 rows, 457 columns and 2668 nonzeros Presolve time: 0.00s Presolved: 868 rows, 457 columns, 2668 nonzeros Variable types: 0 continuous, 457 integer (457 binary) Root relaxation: objective 0.000000e+00, 141 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 50 - 0.00000 - - 0s H 0 0 0.0000000 0.00000 0.0% - 0s Explored 0 nodes (708 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 -- 4 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 19:37:24 2012 Optimize a model with 466 rows, 329 columns and 1334 nonzeros Presolve removed 64 rows and 64 columns Presolve time: 0.00s Presolved: 402 rows, 265 columns, 1206 nonzeros Variable types: 0 continuous, 265 integer (265 binary) Root relaxation: objective 0.000000e+00, 69 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 64 - 0.00000 - - 0s 0 0 infeasible 0 - 0.10000 - - 0s Explored 0 nodes (266 simplex iterations) in 0.00 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 Thu Dec 13 19:37:24 2012 Optimize a model with 667 rows, 393 columns and 2001 nonzeros Presolve time: 0.00s Presolved: 667 rows, 393 columns, 2001 nonzeros Variable types: 0 continuous, 393 integer (393 binary) Root relaxation: objective 0.000000e+00, 138 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 0 122 - 0.00000 - - 0s 0 0 0.00000 0 124 - 0.00000 - - 0s 0 0 infeasible 0 - 0.10000 - - 0s Explored 0 nodes (1155 simplex iterations) in 0.04 seconds Thread count was 1 (of 16 available processors) Model objective exceeds cutoff Best objective -, best bound 1.000000000000e+00, gap - optimal solution found: number of colors: 4