current bounds on the number of colors: 0 -- 63 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 19:37:20 2012 Optimize a model with 6635 rows, 2165 columns and 21669 nonzeros Presolve time: 0.03s Presolved: 6635 rows, 2165 columns, 21669 nonzeros Variable types: 0 continuous, 2165 integer (2165 binary) Root relaxation: objective 0.000000e+00, 156 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 (300 simplex iterations) in 0.05 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 -- 31 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 19:37:20 2012 Optimize a model with 3243 rows, 1157 columns and 10485 nonzeros Presolve time: 0.01s Presolved: 3243 rows, 1157 columns, 10485 nonzeros Variable types: 0 continuous, 1157 integer (1157 binary) Root relaxation: objective 0.000000e+00, 136 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 (233 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 19:37:20 2012 Optimize a model with 1547 rows, 653 columns and 4893 nonzeros Presolve time: 0.00s Presolved: 1547 rows, 653 columns, 4893 nonzeros Variable types: 0 continuous, 653 integer (653 binary) Root relaxation: objective 0.000000e+00, 141 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 (248 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 19:37:20 2012 Optimize a model with 699 rows, 401 columns and 2097 nonzeros Presolve time: 0.00s Presolved: 699 rows, 401 columns, 2097 nonzeros Variable types: 0 continuous, 401 integer (401 binary) Root relaxation: objective 0.000000e+00, 139 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 0 116 - 0.00000 - - 0s 0 0 0.00000 0 122 - 0.00000 - - 0s 0 0 infeasible 0 - 0.10000 - - 0s Explored 0 nodes (1114 simplex iterations) in 0.05 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: 3 -- 7 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 19:37:20 2012 Optimize a model with 1123 rows, 527 columns and 3495 nonzeros Presolve time: 0.00s Presolved: 1123 rows, 527 columns, 3495 nonzeros Variable types: 0 continuous, 527 integer (527 binary) Root relaxation: objective 0.000000e+00, 145 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 (397 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 19:37:20 2012 Optimize a model with 911 rows, 464 columns and 2796 nonzeros Presolve time: 0.00s Presolved: 911 rows, 464 columns, 2796 nonzeros Variable types: 0 continuous, 464 integer (464 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 0.0000000 0.00000 0.0% - 0s Explored 0 nodes (471 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