current bounds on the number of colors: 0 -- 56 Gurobi 5.0.1 (linux64) logging started Sat Dec 15 16:13:29 2012 Optimize a model with 448 rows, 1582 columns and 2744 nonzeros Presolve removed 31 rows and 868 columns Presolve time: 0.00s Presolved: 417 rows, 714 columns, 1876 nonzeros Variable types: 0 continuous, 714 integer (714 binary) Root relaxation: objective 0.000000e+00, 39 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 (39 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 -- 28 Gurobi 5.0.1 (linux64) logging started Sat Dec 15 16:13:29 2012 Optimize a model with 252 rows, 798 columns and 1372 nonzeros Presolve removed 31 rows and 434 columns Presolve time: 0.00s Presolved: 221 rows, 364 columns, 938 nonzeros Variable types: 0 continuous, 364 integer (364 binary) Root relaxation: objective 0.000000e+00, 39 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 (39 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 -- 14 Gurobi 5.0.1 (linux64) logging started Sat Dec 15 16:13:29 2012 Optimize a model with 154 rows, 406 columns and 686 nonzeros Presolve removed 31 rows and 217 columns Presolve time: 0.00s Presolved: 123 rows, 189 columns, 469 nonzeros Variable types: 0 continuous, 189 integer (189 binary) Root relaxation: objective 0.000000e+00, 37 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 (37 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 -- 7 Gurobi 5.0.1 (linux64) logging started Sat Dec 15 16:13:29 2012 Optimize a model with 98 rows, 182 columns and 294 nonzeros Presolve removed 31 rows and 93 columns Presolve time: 0.00s Presolved: 67 rows, 89 columns, 201 nonzeros Variable types: 0 continuous, 89 integer (89 binary) Root relaxation: objective 0.000000e+00, 30 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 (30 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 -- 3 Gurobi 5.0.1 (linux64) logging started Sat Dec 15 16:13:29 2012 Optimize a model with 70 rows, 70 columns and 98 nonzeros Presolve removed 70 rows and 70 columns Presolve time: 0.00s Explored 0 nodes (0 simplex iterations) in 0.00 seconds Thread count was 1 (of 16 available processors) Model objective exceeds cutoff Best objective -, best bound -, gap - current bounds on the number of colors: 1 -- 3 Gurobi 5.0.1 (linux64) logging started Sat Dec 15 16:13:29 2012 Optimize a model with 84 rows, 126 columns and 196 nonzeros Presolve removed 72 rows and 111 columns Presolve time: 0.00s Presolved: 12 rows, 15 columns, 36 nonzeros Variable types: 0 continuous, 15 integer (15 binary) Root relaxation: objective 0.000000e+00, 6 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 (6 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% optimal solution found: number of colors: 2