current bounds on the number of colors: 0 -- 51 Gurobi 5.0.1 (linux64) logging started Sat Dec 15 16:13:21 2012 Optimize a model with 476 rows, 1292 columns and 2550 nonzeros Presolve removed 23 rows and 575 columns Presolve time: 0.00s Presolved: 453 rows, 717 columns, 1975 nonzeros Variable types: 0 continuous, 717 integer (717 binary) Root relaxation: objective 0.000000e+00, 45 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 (45 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 -- 25 Gurobi 5.0.1 (linux64) logging started Sat Dec 15 16:13:21 2012 Optimize a model with 255 rows, 629 columns and 1224 nonzeros Presolve removed 23 rows and 276 columns Presolve time: 0.00s Presolved: 232 rows, 353 columns, 948 nonzeros Variable types: 0 continuous, 353 integer (353 binary) Root relaxation: objective 0.000000e+00, 44 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 (44 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 -- 12 Gurobi 5.0.1 (linux64) logging started Sat Dec 15 16:13:21 2012 Optimize a model with 153 rows, 323 columns and 612 nonzeros Presolve removed 23 rows and 138 columns Presolve time: 0.00s Presolved: 130 rows, 185 columns, 474 nonzeros Variable types: 0 continuous, 185 integer (185 binary) Root relaxation: objective 0.000000e+00, 41 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 (41 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 -- 6 Gurobi 5.0.1 (linux64) logging started Sat Dec 15 16:13:21 2012 Optimize a model with 102 rows, 170 columns and 306 nonzeros Presolve removed 23 rows and 69 columns Presolve time: 0.00s Presolved: 79 rows, 101 columns, 237 nonzeros Variable types: 0 continuous, 101 integer (101 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 -- 3 Gurobi 5.0.1 (linux64) logging started Sat Dec 15 16:13:21 2012 Optimize a model with 68 rows, 68 columns and 102 nonzeros Presolve removed 68 rows and 68 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 16:13:21 2012 Optimize a model with 85 rows, 119 columns and 204 nonzeros Presolve removed 61 rows and 89 columns Presolve time: 0.00s Presolved: 24 rows, 30 columns, 72 nonzeros Variable types: 0 continuous, 30 integer (30 binary) Root relaxation: objective 0.000000e+00, 12 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 (12 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