current bounds on the number of colors: 0 -- 59 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 19:36:57 2012 Optimize a model with 4960 rows, 1880 columns and 16414 nonzeros Presolve time: 0.02s Presolved: 4960 rows, 1880 columns, 16414 nonzeros Variable types: 0 continuous, 1880 integer (1880 binary) Root relaxation: objective 0.000000e+00, 164 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 (281 simplex iterations) in 0.03 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 -- 29 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 19:36:57 2012 Optimize a model with 2425 rows, 995 columns and 7924 nonzeros Presolve time: 0.01s Presolved: 2425 rows, 995 columns, 7924 nonzeros Variable types: 0 continuous, 995 integer (995 binary) Root relaxation: objective 0.000000e+00, 123 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 (213 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 -- 14 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 19:36:57 2012 Optimize a model with 1242 rows, 582 columns and 3962 nonzeros Presolve time: 0.00s Presolved: 1242 rows, 582 columns, 3962 nonzeros Variable types: 0 continuous, 582 integer (582 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 0.0000000 0.00000 0.0% - 0s Explored 0 nodes (237 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 -- 7 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 19:36:57 2012 Optimize a model with 566 rows, 346 columns and 1698 nonzeros Presolve time: 0.00s Presolved: 566 rows, 346 columns, 1698 nonzeros Variable types: 0 continuous, 346 integer (346 binary) Root relaxation: objective 0.000000e+00, 140 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 0 106 - 0.00000 - - 0s 0 0 0.00000 0 112 - 0.00000 - - 0s 0 0 infeasible 0 - 0.10000 - - 0s Explored 0 nodes (997 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 - current bounds on the number of colors: 3 -- 7 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 19:36:58 2012 Optimize a model with 904 rows, 464 columns and 2830 nonzeros Presolve time: 0.00s Presolved: 904 rows, 464 columns, 2830 nonzeros Variable types: 0 continuous, 464 integer (464 binary) Root relaxation: objective 0.000000e+00, 134 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 (267 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: 3 -- 5 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 19:36:58 2012 Optimize a model with 735 rows, 405 columns and 2264 nonzeros Presolve time: 0.00s Presolved: 735 rows, 405 columns, 2264 nonzeros Variable types: 0 continuous, 405 integer (405 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 (383 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: 4