current bounds on the number of colors: 0 -- 55 Gurobi 5.0.1 (linux64) logging started Fri Dec 14 18:20:03 2012 Optimize a model with 1837 rows, 1551 columns and 6831 nonzeros Presolve removed 5 rows and 135 columns Presolve time: 0.01s Presolved: 1832 rows, 1416 columns, 6696 nonzeros Variable types: 0 continuous, 1416 integer (1416 binary) Root relaxation: objective 0.000000e+00, 96 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 (96 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 -- 27 Gurobi 5.0.1 (linux64) logging started Fri Dec 14 18:20:03 2012 Optimize a model with 913 rows, 781 columns and 3289 nonzeros Presolve removed 5 rows and 65 columns Presolve time: 0.01s Presolved: 908 rows, 716 columns, 3224 nonzeros Variable types: 0 continuous, 716 integer (716 binary) Root relaxation: objective 0.000000e+00, 94 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 (94 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 -- 13 Gurobi 5.0.1 (linux64) logging started Fri Dec 14 18:20:03 2012 Optimize a model with 451 rows, 396 columns and 1518 nonzeros Presolve removed 5 rows and 30 columns Presolve time: 0.00s Presolved: 446 rows, 366 columns, 1488 nonzeros Variable types: 0 continuous, 366 integer (366 binary) Root relaxation: objective 0.000000e+00, 85 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 (85 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 -- 6 Gurobi 5.0.1 (linux64) logging started Fri Dec 14 18:20:03 2012 Optimize a model with 253 rows, 231 columns and 759 nonzeros Presolve removed 5 rows and 15 columns Presolve time: 0.00s Presolved: 248 rows, 216 columns, 744 nonzeros Variable types: 0 continuous, 216 integer (216 binary) Root relaxation: objective 0.000000e+00, 108 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 (108 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 -- 3 Gurobi 5.0.1 (linux64) logging started Fri Dec 14 18:20:03 2012 Optimize a model with 121 rows, 121 columns and 253 nonzeros Presolve removed 121 rows and 121 columns Presolve time: 0.00s Explored 0 nodes (0 simplex iterations) in 0.00 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: 1 -- 3 Gurobi 5.0.1 (linux64) logging started Fri Dec 14 18:20:03 2012 Optimize a model with 187 rows, 176 columns and 506 nonzeros Presolve removed 55 rows and 60 columns Presolve time: 0.00s Presolved: 132 rows, 116 columns, 396 nonzeros Variable types: 0 continuous, 116 integer (116 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 0.00000 0 50 - 0.00000 - - 0s 0 0 infeasible 0 - 0.10000 - - 0s Explored 0 nodes (195 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 - optimal solution found: number of colors: 3