current bounds on the number of colors: 0 -- 53 Gurobi 5.0.1 (linux64) logging started Sat Dec 15 16:13:24 2012 Optimize a model with 443 rows, 1393 columns and 2548 nonzeros Presolve removed 30 rows and 780 columns Presolve time: 0.00s Presolved: 413 rows, 613 columns, 1768 nonzeros Variable types: 0 continuous, 613 integer (613 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 -- 26 Gurobi 5.0.1 (linux64) logging started Sat Dec 15 16:13:24 2012 Optimize a model with 248 rows, 704 columns and 1274 nonzeros Presolve removed 30 rows and 390 columns Presolve time: 0.00s Presolved: 218 rows, 314 columns, 884 nonzeros Variable types: 0 continuous, 314 integer (314 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 -- 13 Gurobi 5.0.1 (linux64) logging started Sat Dec 15 16:13:24 2012 Optimize a model with 143 rows, 333 columns and 588 nonzeros Presolve removed 30 rows and 180 columns Presolve time: 0.00s Presolved: 113 rows, 153 columns, 408 nonzeros Variable types: 0 continuous, 153 integer (153 binary) Root relaxation: objective 0.000000e+00, 36 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 (36 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 16:13:24 2012 Optimize a model with 98 rows, 174 columns and 294 nonzeros Presolve removed 30 rows and 90 columns Presolve time: 0.00s Presolved: 68 rows, 84 columns, 204 nonzeros Variable types: 0 continuous, 84 integer (84 binary) Root relaxation: objective 0.000000e+00, 31 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 (31 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 16:13:24 2012 Optimize a model with 68 rows, 68 columns and 98 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 16:13:24 2012 Optimize a model with 83 rows, 121 columns and 196 nonzeros Presolve removed 59 rows and 92 columns Presolve time: 0.00s Presolved: 24 rows, 29 columns, 72 nonzeros Variable types: 0 continuous, 29 integer (29 binary) Root relaxation: objective 0.000000e+00, 11 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 (11 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