current bounds on the number of colors: 0 -- 37 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 19:35:50 2012 Optimize a model with 1315 rows, 737 columns and 4500 nonzeros Presolve time: 0.01s Presolved: 1315 rows, 737 columns, 4500 nonzeros Variable types: 0 continuous, 737 integer (737 binary) Root relaxation: objective 0.000000e+00, 80 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 (130 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 -- 18 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 19:35:50 2012 Optimize a model with 676 rows, 404 columns and 2250 nonzeros Presolve time: 0.00s Presolved: 676 rows, 404 columns, 2250 nonzeros Variable types: 0 continuous, 404 integer (404 binary) Root relaxation: objective 0.000000e+00, 78 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 (134 simplex iterations) in 0.00 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 -- 9 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 19:35:50 2012 Optimize a model with 321 rows, 219 columns and 1000 nonzeros Presolve time: 0.00s Presolved: 321 rows, 219 columns, 1000 nonzeros Variable types: 0 continuous, 219 integer (219 binary) Root relaxation: objective 0.000000e+00, 91 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 (156 simplex iterations) in 0.00 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 19:35:50 2012 Optimize a model with 179 rows, 145 columns and 500 nonzeros Presolve removed 37 rows and 37 columns Presolve time: 0.00s Presolved: 142 rows, 108 columns, 426 nonzeros Variable types: 0 continuous, 108 integer (108 binary) Root relaxation: objective 0.000000e+00, 43 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 37 - 0.00000 - - 0s 0 0 infeasible 0 - 0.10000 - - 0s Explored 0 nodes (145 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 19:35:50 2012 Optimize a model with 250 rows, 182 columns and 750 nonzeros Presolve time: 0.00s Presolved: 250 rows, 182 columns, 750 nonzeros Variable types: 0 continuous, 182 integer (182 binary) Root relaxation: objective 0.000000e+00, 83 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 10 - 0.00000 - - 0s H 0 0 0.0000000 0.00000 0.0% - 0s Explored 0 nodes (354 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: 3