current bounds on the number of colors: 0 -- 61 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 19:37:07 2012 Optimize a model with 5131 rows, 1999 columns and 17040 nonzeros Presolve removed 1 rows and 30 columns Presolve time: 0.03s Presolved: 5130 rows, 1969 columns, 17010 nonzeros Variable types: 0 continuous, 1969 integer (1969 binary) Root relaxation: objective 0.000000e+00, 147 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 (311 simplex iterations) in 0.04 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 -- 30 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 19:37:07 2012 Optimize a model with 2596 rows, 1084 columns and 8520 nonzeros Presolve removed 1 rows and 15 columns Presolve time: 0.01s Presolved: 2595 rows, 1069 columns, 8505 nonzeros Variable types: 0 continuous, 1069 integer (1069 binary) Root relaxation: objective 0.000000e+00, 148 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 (252 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 -- 15 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 19:37:07 2012 Optimize a model with 1244 rows, 596 columns and 3976 nonzeros Presolve removed 1 rows and 7 columns Presolve time: 0.00s Presolved: 1243 rows, 589 columns, 3969 nonzeros Variable types: 0 continuous, 589 integer (589 binary) Root relaxation: objective 0.000000e+00, 128 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 (274 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 -- 7 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 19:37:07 2012 Optimize a model with 568 rows, 352 columns and 1704 nonzeros Presolve removed 1 rows and 3 columns Presolve time: 0.00s Presolved: 567 rows, 349 columns, 1701 nonzeros Variable types: 0 continuous, 349 integer (349 binary) Root relaxation: objective 0.000000e+00, 151 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 0 112 - 0.00000 - - 0s 0 0 0.00000 0 114 - 0.00000 - - 0s 0 0 0.00000 0 149 - 0.00000 - - 0s 0 0 0.00000 0 152 - 0.00000 - - 0s 0 0 0.00000 0 78 - 0.00000 - - 0s 0 0 0.00000 0 143 - 0.00000 - - 0s 0 0 0.00000 0 156 - 0.00000 - - 0s 0 0 0.00000 0 126 - 0.00000 - - 0s 0 0 0.00000 0 134 - 0.00000 - - 0s 0 0 0.00000 0 134 - 0.00000 - - 0s 0 2 0.00000 0 134 - 0.00000 - - 0s Cutting planes: Zero half: 4 Explored 3 nodes (4744 simplex iterations) in 0.23 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 Thu Dec 13 19:37:08 2012 Optimize a model with 906 rows, 474 columns and 2840 nonzeros Presolve removed 1 rows and 5 columns Presolve time: 0.00s Presolved: 905 rows, 469 columns, 2835 nonzeros Variable types: 0 continuous, 469 integer (469 binary) Root relaxation: objective 0.000000e+00, 133 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 (269 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 Thu Dec 13 19:37:08 2012 Optimize a model with 737 rows, 413 columns and 2272 nonzeros Presolve removed 1 rows and 4 columns Presolve time: 0.00s Presolved: 736 rows, 409 columns, 2268 nonzeros Variable types: 0 continuous, 409 integer (409 binary) Root relaxation: objective 0.000000e+00, 138 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 36 - 0.00000 - - 0s H 0 0 0.0000000 0.00000 0.0% - 0s Explored 0 nodes (572 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