current bounds on the number of colors: 0 -- 88 Gurobi 5.0.1 (linux64) logging started Fri Dec 14 18:22:30 2012 Optimize a model with 9416 rows, 4084 columns and 31856 nonzeros Presolve removed 1 rows and 44 columns Presolve time: 0.06s Presolved: 9415 rows, 4040 columns, 31812 nonzeros Variable types: 0 continuous, 4040 integer (4040 binary) Root relaxation: objective 0.000000e+00, 222 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 (222 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 -- 44 Gurobi 5.0.1 (linux64) logging started Fri Dec 14 18:22:30 2012 Optimize a model with 4752 rows, 2148 columns and 15928 nonzeros Presolve removed 1 rows and 22 columns Presolve time: 0.02s Presolved: 4751 rows, 2126 columns, 15906 nonzeros Variable types: 0 continuous, 2126 integer (2126 binary) Root relaxation: objective 0.000000e+00, 201 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 (346 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 -- 22 Gurobi 5.0.1 (linux64) logging started Fri Dec 14 18:22:30 2012 Optimize a model with 2420 rows, 1180 columns and 7964 nonzeros Presolve removed 1 rows and 11 columns Presolve time: 0.01s Presolved: 2419 rows, 1169 columns, 7953 nonzeros Variable types: 0 continuous, 1169 integer (1169 binary) Root relaxation: objective 0.000000e+00, 193 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 (317 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 -- 11 Gurobi 5.0.1 (linux64) logging started Fri Dec 14 18:22:31 2012 Optimize a model with 1148 rows, 652 columns and 3620 nonzeros Presolve removed 1 rows and 5 columns Presolve time: 0.00s Presolved: 1147 rows, 647 columns, 3615 nonzeros Variable types: 0 continuous, 647 integer (647 binary) Root relaxation: objective 0.000000e+00, 196 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 (336 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 18:22:31 2012 Optimize a model with 512 rows, 388 columns and 1448 nonzeros Presolve removed 88 rows and 89 columns Presolve time: 0.00s Presolved: 424 rows, 299 columns, 1272 nonzeros Variable types: 0 continuous, 299 integer (299 binary) Root relaxation: objective 0.000000e+00, 91 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 87 - 0.00000 - - 0s 0 0 infeasible 0 - 0.10000 - - 0s Explored 0 nodes (334 simplex iterations) in 0.01 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 18:22:31 2012 Optimize a model with 724 rows, 476 columns and 2172 nonzeros Presolve removed 1 rows and 3 columns Presolve time: 0.00s Presolved: 723 rows, 473 columns, 2169 nonzeros Variable types: 0 continuous, 473 integer (473 binary) Root relaxation: objective 0.000000e+00, 192 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 0 154 - 0.00000 - - 0s 0 0 0.00000 0 154 - 0.00000 - - 0s 0 0 0.00000 0 146 - 0.00000 - - 0s 0 0 0.00000 0 146 - 0.00000 - - 0s 0 0 0.00000 0 182 - 0.00000 - - 0s 0 0 0.00000 0 163 - 0.00000 - - 0s 0 0 0.00000 0 152 - 0.00000 - - 0s 0 0 0.00000 0 189 - 0.00000 - - 0s 0 0 0.00000 0 163 - 0.00000 - - 0s 0 0 0.00000 0 175 - 0.00000 - - 0s 0 0 0.00000 0 175 - 0.00000 - - 0s 0 2 0.00000 0 175 - 0.00000 - - 0s Cutting planes: Zero half: 4 Explored 7 nodes (5804 simplex iterations) in 0.29 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 18:22:31 2012 Optimize a model with 936 rows, 564 columns and 2896 nonzeros Presolve removed 1 rows and 4 columns Presolve time: 0.00s Presolved: 935 rows, 560 columns, 2892 nonzeros Variable types: 0 continuous, 560 integer (560 binary) Root relaxation: objective 0.000000e+00, 206 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 (782 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