current bounds on the number of colors: 0 -- 118 Gurobi 5.0.1 (linux64) logging started Fri Dec 14 18:29:34 2012 Optimize a model with 21240 rows, 7320 columns and 70328 nonzeros Presolve removed 1 rows and 59 columns Presolve time: 0.13s Presolved: 21239 rows, 7261 columns, 70269 nonzeros Variable types: 0 continuous, 7261 integer (7261 binary) Root relaxation: objective 0.000000e+00, 366 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 (592 simplex iterations) in 0.18 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 -- 59 Gurobi 5.0.1 (linux64) logging started Fri Dec 14 18:29:34 2012 Optimize a model with 10500 rows, 3780 columns and 34568 nonzeros Presolve removed 1 rows and 29 columns Presolve time: 0.05s Presolved: 10499 rows, 3751 columns, 34539 nonzeros Variable types: 0 continuous, 3751 integer (3751 binary) Root relaxation: objective 0.000000e+00, 299 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 (519 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 -- 29 Gurobi 5.0.1 (linux64) logging started Fri Dec 14 18:29:34 2012 Optimize a model with 5130 rows, 2010 columns and 16688 nonzeros Presolve removed 1 rows and 14 columns Presolve time: 0.02s Presolved: 5129 rows, 1996 columns, 16674 nonzeros Variable types: 0 continuous, 1996 integer (1996 binary) Root relaxation: objective 0.000000e+00, 264 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 (468 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 18:29:34 2012 Optimize a model with 2624 rows, 1184 columns and 8344 nonzeros Presolve removed 1 rows and 7 columns Presolve time: 0.01s Presolved: 2623 rows, 1177 columns, 8337 nonzeros Variable types: 0 continuous, 1177 integer (1177 binary) Root relaxation: objective 0.000000e+00, 264 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 (463 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 18:29:34 2012 Optimize a model with 1192 rows, 712 columns and 3576 nonzeros Presolve removed 1 rows and 3 columns Presolve time: 0.00s Presolved: 1191 rows, 709 columns, 3573 nonzeros Variable types: 0 continuous, 709 integer (709 binary) Root relaxation: objective 0.000000e+00, 265 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 0 224 - 0.00000 - - 0s 0 0 0.00000 0 220 - 0.00000 - - 0s 0 0 0.00000 0 216 - 0.00000 - - 0s 0 0 0.00000 0 270 - 0.00000 - - 0s 0 0 0.00000 0 273 - 0.00000 - - 0s 0 0 0.00000 0 285 - 0.00000 - - 0s 0 0 0.00000 0 264 - 0.00000 - - 0s 0 0 0.00000 0 259 - 0.00000 - - 0s 0 0 0.00000 0 271 - 0.00000 - - 0s 0 0 0.00000 0 274 - 0.00000 - - 0s 0 0 0.00000 0 263 - 0.00000 - - 0s 0 2 0.00000 0 263 - 0.00000 - - 1s Cutting planes: Zero half: 9 Explored 5 nodes (14078 simplex iterations) in 1.01 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 18:29:35 2012 Optimize a model with 1908 rows, 948 columns and 5960 nonzeros Presolve removed 1 rows and 5 columns Presolve time: 0.01s Presolved: 1907 rows, 943 columns, 5955 nonzeros Variable types: 0 continuous, 943 integer (943 binary) Root relaxation: objective 0.000000e+00, 271 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 (697 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: 3 -- 5 Gurobi 5.0.1 (linux64) logging started Fri Dec 14 18:29:36 2012 Optimize a model with 1550 rows, 830 columns and 4768 nonzeros Presolve removed 1 rows and 4 columns Presolve time: 0.00s Presolved: 1549 rows, 826 columns, 4764 nonzeros Variable types: 0 continuous, 826 integer (826 binary) Root relaxation: objective 0.000000e+00, 295 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 (888 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% optimal solution found: number of colors: 4