current bounds on the number of colors: 0 -- 83 Gurobi 5.0.1 (linux64) logging started Fri Dec 14 18:21:50 2012 Optimize a model with 6971 rows, 3571 columns and 24067 nonzeros Presolve removed 2 rows and 82 columns Presolve time: 0.05s Presolved: 6969 rows, 3489 columns, 23985 nonzeros Variable types: 0 continuous, 3489 integer (3489 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 (309 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% current bounds on the number of colors: 0 -- 41 Gurobi 5.0.1 (linux64) logging started Fri Dec 14 18:21:50 2012 Optimize a model with 3443 rows, 1828 columns and 11740 nonzeros Presolve removed 2 rows and 40 columns Presolve time: 0.01s Presolved: 3441 rows, 1788 columns, 11700 nonzeros Variable types: 0 continuous, 1788 integer (1788 binary) Root relaxation: objective 0.000000e+00, 197 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 (332 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 -- 20 Gurobi 5.0.1 (linux64) logging started Fri Dec 14 18:21:50 2012 Optimize a model with 1763 rows, 998 columns and 5870 nonzeros Presolve removed 2 rows and 20 columns Presolve time: 0.01s Presolved: 1761 rows, 978 columns, 5850 nonzeros Variable types: 0 continuous, 978 integer (978 binary) Root relaxation: objective 0.000000e+00, 178 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 (308 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 -- 10 Gurobi 5.0.1 (linux64) logging started Fri Dec 14 18:21:50 2012 Optimize a model with 923 rows, 583 columns and 2935 nonzeros Presolve removed 2 rows and 10 columns Presolve time: 0.00s Presolved: 921 rows, 573 columns, 2925 nonzeros Variable types: 0 continuous, 573 integer (573 binary) Root relaxation: objective 0.000000e+00, 194 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 (291 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 -- 5 Gurobi 5.0.1 (linux64) logging started Fri Dec 14 18:21:50 2012 Optimize a model with 419 rows, 334 columns and 1174 nonzeros Presolve removed 83 rows and 85 columns Presolve time: 0.00s Presolved: 336 rows, 249 columns, 1008 nonzeros Variable types: 0 continuous, 249 integer (249 binary) Root relaxation: objective 0.000000e+00, 84 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 81 - 0.00000 - - 0s Explored 0 nodes (304 simplex iterations) in 0.00 seconds Thread count was 1 (of 16 available processors) Model objective exceeds cutoff Best objective -, best bound 1.000000000000e+00, gap - current bounds on the number of colors: 2 -- 5 Gurobi 5.0.1 (linux64) logging started Fri Dec 14 18:21:50 2012 Optimize a model with 587 rows, 417 columns and 1761 nonzeros Presolve removed 2 rows and 6 columns Presolve time: 0.00s Presolved: 585 rows, 411 columns, 1755 nonzeros Variable types: 0 continuous, 411 integer (411 binary) Root relaxation: objective 0.000000e+00, 229 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 0 161 - 0.00000 - - 0s 0 0 0.00000 0 102 - 0.00000 - - 0s 0 0 0.00000 0 118 - 0.00000 - - 0s 0 0 0.00000 0 165 - 0.00000 - - 0s 0 0 0.00000 0 150 - 0.00000 - - 0s 0 0 0.00000 0 74 - 0.00000 - - 0s 0 0 0.00000 0 113 - 0.00000 - - 0s 0 0 0.00000 0 106 - 0.00000 - - 0s 0 0 0.00000 0 105 - 0.00000 - - 0s 0 0 0.00000 0 46 - 0.00000 - - 0s 0 0 0.00000 0 60 - 0.00000 - - 0s 0 0 0.00000 0 91 - 0.00000 - - 0s 0 0 0.00000 0 94 - 0.00000 - - 0s 0 0 0.00000 0 94 - 0.00000 - - 0s 0 2 0.00000 0 94 - 0.00000 - - 0s Cutting planes: Zero half: 6 Explored 20 nodes (6025 simplex iterations) in 0.31 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 -- 5 Gurobi 5.0.1 (linux64) logging started Fri Dec 14 18:21:51 2012 Optimize a model with 755 rows, 500 columns and 2348 nonzeros Presolve removed 2 rows and 8 columns Presolve time: 0.00s Presolved: 753 rows, 492 columns, 2340 nonzeros Variable types: 0 continuous, 492 integer (492 binary) Root relaxation: objective 0.000000e+00, 181 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 (376 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