current bounds on the number of colors: 0 -- 37 Gurobi 5.0.1 (linux64) logging started Fri Dec 14 18:19:34 2012 Optimize a model with 757 rows, 706 columns and 2826 nonzeros Presolve removed 4 rows and 72 columns Presolve time: 0.00s Presolved: 753 rows, 634 columns, 2754 nonzeros Variable types: 0 continuous, 634 integer (634 binary) Root relaxation: objective 0.000000e+00, 62 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 (62 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 -- 18 Gurobi 5.0.1 (linux64) logging started Fri Dec 14 18:19:34 2012 Optimize a model with 397 rows, 373 columns and 1413 nonzeros Presolve removed 4 rows and 36 columns Presolve time: 0.00s Presolved: 393 rows, 337 columns, 1377 nonzeros Variable types: 0 continuous, 337 integer (337 binary) Root relaxation: objective 0.000000e+00, 67 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 (101 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 -- 9 Gurobi 5.0.1 (linux64) logging started Fri Dec 14 18:19:34 2012 Optimize a model with 197 rows, 188 columns and 628 nonzeros Presolve removed 4 rows and 16 columns Presolve time: 0.00s Presolved: 193 rows, 172 columns, 612 nonzeros Variable types: 0 continuous, 172 integer (172 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 -- 4 Gurobi 5.0.1 (linux64) logging started Fri Dec 14 18:19:34 2012 Optimize a model with 117 rows, 114 columns and 314 nonzeros Presolve removed 37 rows and 41 columns Presolve time: 0.00s Presolved: 80 rows, 73 columns, 240 nonzeros Variable types: 0 continuous, 73 integer (73 binary) Root relaxation: objective 0.000000e+00, 36 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 33 - 0.00000 - - 0s Explored 0 nodes (120 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 18:19:34 2012 Optimize a model with 157 rows, 151 columns and 471 nonzeros Presolve removed 4 rows and 12 columns Presolve time: 0.00s Presolved: 153 rows, 139 columns, 459 nonzeros Variable types: 0 continuous, 139 integer (139 binary) Root relaxation: objective 0.000000e+00, 57 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 (57 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