current bounds on the number of colors: 0 -- 55 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 19:36:40 2012 Optimize a model with 4483 rows, 1649 columns and 14769 nonzeros Presolve time: 0.02s Presolved: 4483 rows, 1649 columns, 14769 nonzeros Variable types: 0 continuous, 1649 integer (1649 binary) Root relaxation: objective 0.000000e+00, 131 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 (247 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 -- 27 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 19:36:40 2012 Optimize a model with 2187 rows, 879 columns and 7111 nonzeros Presolve time: 0.01s Presolved: 2187 rows, 879 columns, 7111 nonzeros Variable types: 0 continuous, 879 integer (879 binary) Root relaxation: objective 0.000000e+00, 115 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 (205 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 -- 13 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 19:36:40 2012 Optimize a model with 1039 rows, 494 columns and 3282 nonzeros Presolve time: 0.00s Presolved: 1039 rows, 494 columns, 3282 nonzeros Variable types: 0 continuous, 494 integer (494 binary) Root relaxation: objective 0.000000e+00, 127 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 (240 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 -- 6 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 19:36:40 2012 Optimize a model with 547 rows, 329 columns and 1641 nonzeros Presolve time: 0.00s Presolved: 547 rows, 329 columns, 1641 nonzeros Variable types: 0 continuous, 329 integer (329 binary) Root relaxation: objective 0.000000e+00, 121 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 0 100 - 0.00000 - - 0s 0 0 0.00000 0 118 - 0.00000 - - 0s 0 0 infeasible 0 - 0.10000 - - 0s Explored 0 nodes (1147 simplex iterations) in 0.05 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 -- 6 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 19:36:40 2012 Optimize a model with 711 rows, 384 columns and 2188 nonzeros Presolve time: 0.00s Presolved: 711 rows, 384 columns, 2188 nonzeros Variable types: 0 continuous, 384 integer (384 binary) Root relaxation: objective 0.000000e+00, 129 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 76 - 0.00000 - - 0s H 0 0 0.0000000 0.00000 0.0% - 0s Explored 0 nodes (704 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% optimal solution found: number of colors: 4