current bounds on the number of colors: 0 -- 33 Gurobi 5.0.1 (linux64) logging started Fri Dec 14 18:19:30 2012 Optimize a model with 481 rows, 556 columns and 1872 nonzeros Presolve removed 3 rows and 48 columns Presolve time: 0.00s Presolved: 478 rows, 508 columns, 1824 nonzeros Variable types: 0 continuous, 508 integer (508 binary) Root relaxation: objective 0.000000e+00, 55 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 (55 simplex iterations) in 0.00 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 -- 16 Gurobi 5.0.1 (linux64) logging started Fri Dec 14 18:19:30 2012 Optimize a model with 257 rows, 292 columns and 936 nonzeros Presolve removed 3 rows and 24 columns Presolve time: 0.00s Presolved: 254 rows, 268 columns, 912 nonzeros Variable types: 0 continuous, 268 integer (268 binary) Root relaxation: objective 0.000000e+00, 51 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 (51 simplex iterations) in 0.00 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 -- 8 Gurobi 5.0.1 (linux64) logging started Fri Dec 14 18:19:30 2012 Optimize a model with 145 rows, 160 columns and 468 nonzeros Presolve removed 3 rows and 12 columns Presolve time: 0.00s Presolved: 142 rows, 148 columns, 456 nonzeros Variable types: 0 continuous, 148 integer (148 binary) Root relaxation: objective 0.000000e+00, 50 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 (50 simplex iterations) in 0.00 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 -- 4 Gurobi 5.0.1 (linux64) logging started Fri Dec 14 18:19:30 2012 Optimize a model with 89 rows, 94 columns and 234 nonzeros Presolve removed 37 rows and 42 columns Presolve time: 0.00s Presolved: 52 rows, 52 columns, 156 nonzeros Variable types: 0 continuous, 52 integer (52 binary) Root relaxation: objective 0.000000e+00, 27 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 26 - 0.00000 - - 0s Explored 0 nodes (109 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 -- 4 Gurobi 5.0.1 (linux64) logging started Fri Dec 14 18:19:30 2012 Optimize a model with 117 rows, 127 columns and 351 nonzeros Presolve removed 3 rows and 9 columns Presolve time: 0.00s Presolved: 114 rows, 118 columns, 342 nonzeros Variable types: 0 continuous, 118 integer (118 binary) Root relaxation: objective 0.000000e+00, 49 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 (49 simplex iterations) in 0.00 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: 3