current bounds on the number of colors: 0 -- 25 Gurobi 5.0.1 (linux64) logging started Sat Dec 15 16:12:54 2012 Optimize a model with 49 rows, 302 columns and 372 nonzeros Presolve removed 21 rows and 252 columns Presolve time: 0.00s Presolved: 28 rows, 50 columns, 120 nonzeros Variable types: 0 continuous, 50 integer (50 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% current bounds on the number of colors: 0 -- 12 Gurobi 5.0.1 (linux64) logging started Sat Dec 15 16:12:54 2012 Optimize a model with 37 rows, 152 columns and 186 nonzeros Presolve removed 21 rows and 126 columns Presolve time: 0.00s Presolved: 16 rows, 26 columns, 60 nonzeros Variable types: 0 continuous, 26 integer (26 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% current bounds on the number of colors: 0 -- 6 Gurobi 5.0.1 (linux64) logging started Sat Dec 15 16:12:54 2012 Optimize a model with 31 rows, 77 columns and 93 nonzeros Presolve removed 21 rows and 63 columns Presolve time: 0.00s Presolved: 10 rows, 14 columns, 30 nonzeros Variable types: 0 continuous, 14 integer (14 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% current bounds on the number of colors: 0 -- 3 Gurobi 5.0.1 (linux64) logging started Sat Dec 15 16:12:54 2012 Optimize a model with 27 rows, 27 columns and 31 nonzeros Presolve removed 27 rows and 27 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 16:12:54 2012 Optimize a model with 29 rows, 52 columns and 62 nonzeros Presolve removed 29 rows and 52 columns Presolve time: 0.00s Explored 0 nodes (0 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