current bounds on the number of colors: 0 -- 97 Gurobi 5.0.1 (linux64) logging started Fri Dec 14 18:24:03 2012 Optimize a model with 10801 rows, 4879 columns and 36768 nonzeros Presolve removed 2 rows and 96 columns Presolve time: 0.07s Presolved: 10799 rows, 4783 columns, 36672 nonzeros Variable types: 0 continuous, 4783 integer (4783 binary) Root relaxation: objective 0.000000e+00, 230 iterations, 0.01 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 (230 simplex iterations) in 0.08 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 -- 48 Gurobi 5.0.1 (linux64) logging started Fri Dec 14 18:24:04 2012 Optimize a model with 5449 rows, 2551 columns and 18384 nonzeros Presolve removed 2 rows and 48 columns Presolve time: 0.02s Presolved: 5447 rows, 2503 columns, 18336 nonzeros Variable types: 0 continuous, 2503 integer (2503 binary) Root relaxation: objective 0.000000e+00, 231 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 (231 simplex iterations) in 0.03 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 -- 24 Gurobi 5.0.1 (linux64) logging started Fri Dec 14 18:24:04 2012 Optimize a model with 2773 rows, 1387 columns and 9192 nonzeros Presolve removed 2 rows and 24 columns Presolve time: 0.01s Presolved: 2771 rows, 1363 columns, 9168 nonzeros Variable types: 0 continuous, 1363 integer (1363 binary) Root relaxation: objective 0.000000e+00, 195 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 (318 simplex iterations) in 0.02 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 Fri Dec 14 18:24:04 2012 Optimize a model with 1435 rows, 805 columns and 4596 nonzeros Presolve removed 2 rows and 12 columns Presolve time: 0.00s Presolved: 1433 rows, 793 columns, 4584 nonzeros Variable types: 0 continuous, 793 integer (793 binary) Root relaxation: objective 0.000000e+00, 199 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 (430 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 -- 6 Gurobi 5.0.1 (linux64) logging started Fri Dec 14 18:24:04 2012 Optimize a model with 766 rows, 514 columns and 2298 nonzeros Presolve removed 2 rows and 6 columns Presolve time: 0.00s Presolved: 764 rows, 508 columns, 2292 nonzeros Variable types: 0 continuous, 508 integer (508 binary) Root relaxation: objective 0.000000e+00, 249 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 0.00000 0 148 - 0.00000 - - 0s 0 0 0.00000 0 142 - 0.00000 - - 0s 0 0 0.00000 0 156 - 0.00000 - - 0s 0 0 0.00000 0 150 - 0.00000 - - 0s 0 0 0.00000 0 220 - 0.00000 - - 0s 0 0 0.00000 0 202 - 0.00000 - - 0s 0 0 0.00000 0 166 - 0.00000 - - 0s 0 0 0.00000 0 140 - 0.00000 - - 0s 0 0 0.00000 0 139 - 0.00000 - - 0s 0 0 0.00000 0 161 - 0.00000 - - 0s 0 0 0.00000 0 167 - 0.00000 - - 0s 0 0 0.00000 0 138 - 0.00000 - - 0s 0 2 0.00000 0 138 - 0.00000 - - 0s Cutting planes: Zero half: 21 Explored 73 nodes (8833 simplex iterations) in 0.39 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: 3 -- 6 Gurobi 5.0.1 (linux64) logging started Fri Dec 14 18:24:04 2012 Optimize a model with 989 rows, 611 columns and 3064 nonzeros Presolve removed 2 rows and 8 columns Presolve time: 0.00s Presolved: 987 rows, 603 columns, 3056 nonzeros Variable types: 0 continuous, 603 integer (603 binary) Root relaxation: objective 0.000000e+00, 231 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 (440 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% optimal solution found: number of colors: 4