current bounds on the number of colors: 0 -- 114 Gurobi 5.0.1 (linux64) logging started Fri Dec 14 18:28:19 2012 Optimize a model with 20406 rows, 6854 columns and 67374 nonzeros Presolve removed 1 rows and 57 columns Presolve time: 0.13s Presolved: 20405 rows, 6797 columns, 67317 nonzeros Variable types: 0 continuous, 6797 integer (6797 binary) Root relaxation: objective 0.000000e+00, 345 iterations, 0.02 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 (345 simplex iterations) in 0.15 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 -- 57 Gurobi 5.0.1 (linux64) logging started Fri Dec 14 18:28:19 2012 Optimize a model with 10082 rows, 3548 columns and 33096 nonzeros Presolve removed 1 rows and 28 columns Presolve time: 0.05s Presolved: 10081 rows, 3520 columns, 33068 nonzeros Variable types: 0 continuous, 3520 integer (3520 binary) Root relaxation: objective 0.000000e+00, 301 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 (504 simplex iterations) in 0.07 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 Fri Dec 14 18:28:19 2012 Optimize a model with 5098 rows, 1952 columns and 16548 nonzeros Presolve removed 1 rows and 14 columns Presolve time: 0.02s Presolved: 5097 rows, 1938 columns, 16534 nonzeros Variable types: 0 continuous, 1938 integer (1938 binary) Root relaxation: objective 0.000000e+00, 233 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 (402 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 -- 14 Gurobi 5.0.1 (linux64) logging started Fri Dec 14 18:28:20 2012 Optimize a model with 2606 rows, 1154 columns and 8274 nonzeros Presolve removed 1 rows and 7 columns Presolve time: 0.01s Presolved: 2605 rows, 1147 columns, 8267 nonzeros Variable types: 0 continuous, 1147 integer (1147 binary) Root relaxation: objective 0.000000e+00, 246 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 (438 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 -- 7 Gurobi 5.0.1 (linux64) logging started Fri Dec 14 18:28:20 2012 Optimize a model with 1182 rows, 698 columns and 3546 nonzeros Presolve removed 1 rows and 3 columns Presolve time: 0.00s Presolved: 1181 rows, 695 columns, 3543 nonzeros Variable types: 0 continuous, 695 integer (695 binary) Root relaxation: objective 0.000000e+00, 261 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 0 216 - 0.00000 - - 0s 0 0 0.00000 0 182 - 0.00000 - - 0s 0 0 0.00000 0 216 - 0.00000 - - 0s 0 0 0.00000 0 269 - 0.00000 - - 0s 0 0 0.00000 0 214 - 0.00000 - - 0s 0 0 0.00000 0 210 - 0.00000 - - 0s 0 0 0.00000 0 236 - 0.00000 - - 0s 0 0 0.00000 0 250 - 0.00000 - - 0s 0 0 0.00000 0 281 - 0.00000 - - 0s 0 0 0.00000 0 281 - 0.00000 - - 0s 0 2 0.00000 0 281 - 0.00000 - - 0s Cutting planes: Zero half: 16 Explored 5 nodes (12974 simplex iterations) in 0.89 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 -- 7 Gurobi 5.0.1 (linux64) logging started Fri Dec 14 18:28:20 2012 Optimize a model with 1894 rows, 926 columns and 5910 nonzeros Presolve removed 1 rows and 5 columns Presolve time: 0.01s Presolved: 1893 rows, 921 columns, 5905 nonzeros Variable types: 0 continuous, 921 integer (921 binary) Root relaxation: objective 0.000000e+00, 257 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 (480 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: 3 -- 5 Gurobi 5.0.1 (linux64) logging started Fri Dec 14 18:28:21 2012 Optimize a model with 1538 rows, 812 columns and 4728 nonzeros Presolve removed 1 rows and 4 columns Presolve time: 0.00s Presolved: 1537 rows, 808 columns, 4724 nonzeros Variable types: 0 continuous, 808 integer (808 binary) Root relaxation: objective 0.000000e+00, 268 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 0 113 - 0.00000 - - 0s H 0 0 0.0000000 0.00000 0.0% - 0s Explored 0 nodes (1861 simplex iterations) in 0.06 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