current bounds on the number of colors: 0 -- 57 Gurobi 5.0.1 (linux64) logging started Sat Dec 15 16:13:30 2012 Optimize a model with 617 rows, 1616 columns and 3276 nonzeros Presolve removed 27 rows and 756 columns Presolve time: 0.01s Presolved: 590 rows, 860 columns, 2520 nonzeros Variable types: 0 continuous, 860 integer (860 binary) Root relaxation: objective 0.000000e+00, 49 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 (49 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 16:13:30 2012 Optimize a model with 337 rows, 818 columns and 1638 nonzeros Presolve removed 27 rows and 378 columns Presolve time: 0.00s Presolved: 310 rows, 440 columns, 1260 nonzeros Variable types: 0 continuous, 440 integer (440 binary) Root relaxation: objective 0.000000e+00, 49 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 (49 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 16:13:30 2012 Optimize a model with 197 rows, 419 columns and 819 nonzeros Presolve removed 27 rows and 189 columns Presolve time: 0.00s Presolved: 170 rows, 230 columns, 630 nonzeros Variable types: 0 continuous, 230 integer (230 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 -- 7 Gurobi 5.0.1 (linux64) logging started Sat Dec 15 16:13:30 2012 Optimize a model with 117 rows, 191 columns and 351 nonzeros Presolve removed 27 rows and 81 columns Presolve time: 0.00s Presolved: 90 rows, 110 columns, 270 nonzeros Variable types: 0 continuous, 110 integer (110 binary) Root relaxation: objective 0.000000e+00, 42 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 (42 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 16:13:30 2012 Optimize a model with 77 rows, 77 columns and 117 nonzeros Presolve removed 77 rows and 77 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 16:13:30 2012 Optimize a model with 97 rows, 134 columns and 234 nonzeros Presolve removed 71 rows and 105 columns Presolve time: 0.00s Presolved: 26 rows, 29 columns, 78 nonzeros Variable types: 0 continuous, 29 integer (29 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