current bounds on the number of colors: 0 -- 54 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 19:36:35 2012 Optimize a model with 4509 rows, 1623 columns and 14823 nonzeros Presolve time: 0.02s Presolved: 4509 rows, 1623 columns, 14823 nonzeros Variable types: 0 continuous, 1623 integer (1623 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 (239 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 19:36:35 2012 Optimize a model with 2199 rows, 867 columns and 7137 nonzeros Presolve time: 0.01s Presolved: 2199 rows, 867 columns, 7137 nonzeros Variable types: 0 continuous, 867 integer (867 binary) Root relaxation: objective 0.000000e+00, 125 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 (221 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 19:36:35 2012 Optimize a model with 1044 rows, 489 columns and 3294 nonzeros Presolve time: 0.00s Presolved: 1044 rows, 489 columns, 3294 nonzeros Variable types: 0 continuous, 489 integer (489 binary) Root relaxation: objective 0.000000e+00, 118 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 (224 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 19:36:35 2012 Optimize a model with 549 rows, 327 columns and 1647 nonzeros Presolve time: 0.00s Presolved: 549 rows, 327 columns, 1647 nonzeros Variable types: 0 continuous, 327 integer (327 binary) Root relaxation: objective 0.000000e+00, 136 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 68 - 0.00000 - - 0s 0 0 0.00000 0 100 - 0.00000 - - 0s 0 0 infeasible 0 - 0.10000 - - 0s Explored 0 nodes (1001 simplex iterations) in 0.03 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 19:36:35 2012 Optimize a model with 714 rows, 381 columns and 2196 nonzeros Presolve time: 0.00s Presolved: 714 rows, 381 columns, 2196 nonzeros Variable types: 0 continuous, 381 integer (381 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 (421 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