current bounds on the number of colors: 0 -- 72 Gurobi 5.0.1 (linux64) logging started Sat Dec 15 16:13:55 2012 Optimize a model with 936 rows, 2616 columns and 5184 nonzeros Presolve removed 34 rows and 1224 columns Presolve time: 0.01s Presolved: 902 rows, 1392 columns, 3960 nonzeros Variable types: 0 continuous, 1392 integer (1392 binary) Root relaxation: objective 0.000000e+00, 61 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 (61 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 -- 36 Gurobi 5.0.1 (linux64) logging started Sat Dec 15 16:13:55 2012 Optimize a model with 504 rows, 1320 columns and 2592 nonzeros Presolve removed 34 rows and 612 columns Presolve time: 0.00s Presolved: 470 rows, 708 columns, 1980 nonzeros Variable types: 0 continuous, 708 integer (708 binary) Root relaxation: objective 0.000000e+00, 61 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 (61 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 -- 18 Gurobi 5.0.1 (linux64) logging started Sat Dec 15 16:13:55 2012 Optimize a model with 288 rows, 672 columns and 1296 nonzeros Presolve removed 34 rows and 306 columns Presolve time: 0.00s Presolved: 254 rows, 366 columns, 990 nonzeros Variable types: 0 continuous, 366 integer (366 binary) Root relaxation: objective 0.000000e+00, 59 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 (59 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 -- 9 Gurobi 5.0.1 (linux64) logging started Sat Dec 15 16:13:55 2012 Optimize a model with 168 rows, 312 columns and 576 nonzeros Presolve removed 34 rows and 136 columns Presolve time: 0.00s Presolved: 134 rows, 176 columns, 440 nonzeros Variable types: 0 continuous, 176 integer (176 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 -- 4 Gurobi 5.0.1 (linux64) logging started Sat Dec 15 16:13:55 2012 Optimize a model with 120 rows, 168 columns and 288 nonzeros Presolve removed 88 rows and 130 columns Presolve time: 0.00s Presolved: 32 rows, 38 columns, 96 nonzeros Variable types: 0 continuous, 38 integer (38 binary) Root relaxation: objective 0.000000e+00, 15 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 (15 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 -- 2 Gurobi 5.0.1 (linux64) logging started Sat Dec 15 16:13:55 2012 Optimize a model with 96 rows, 96 columns and 144 nonzeros Presolve removed 96 rows and 96 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 - optimal solution found: number of colors: 2