current bounds on the number of colors: 0 -- 37 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 19:35:50 2012 Optimize a model with 1531 rows, 749 columns and 5148 nonzeros Presolve time: 0.01s Presolved: 1531 rows, 749 columns, 5148 nonzeros Variable types: 0 continuous, 749 integer (749 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 (139 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 Thu Dec 13 19:35:50 2012 Optimize a model with 784 rows, 416 columns and 2574 nonzeros Presolve time: 0.00s Presolved: 784 rows, 416 columns, 2574 nonzeros Variable types: 0 continuous, 416 integer (416 binary) Root relaxation: objective 0.000000e+00, 75 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 (120 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 Thu Dec 13 19:35:50 2012 Optimize a model with 369 rows, 231 columns and 1144 nonzeros Presolve time: 0.00s Presolved: 369 rows, 231 columns, 1144 nonzeros Variable types: 0 continuous, 231 integer (231 binary) Root relaxation: objective 0.000000e+00, 84 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 (147 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 Thu Dec 13 19:35:50 2012 Optimize a model with 203 rows, 157 columns and 572 nonzeros Presolve removed 37 rows and 37 columns Presolve time: 0.00s Presolved: 166 rows, 120 columns, 498 nonzeros Variable types: 0 continuous, 120 integer (120 binary) Root relaxation: objective 0.000000e+00, 38 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 37 - 0.00000 - - 0s 0 0 infeasible 0 - 0.10000 - - 0s Explored 0 nodes (150 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 Thu Dec 13 19:35:50 2012 Optimize a model with 286 rows, 194 columns and 858 nonzeros Presolve time: 0.00s Presolved: 286 rows, 194 columns, 858 nonzeros Variable types: 0 continuous, 194 integer (194 binary) Root relaxation: objective 0.000000e+00, 90 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 68 - 0.00000 - - 0s 0 0 0.00000 0 75 - 0.00000 - - 0s 0 0 0.00000 0 32 - 0.00000 - - 0s 0 0 0.00000 0 44 - 0.00000 - - 0s 0 0 0.00000 0 48 - 0.00000 - - 0s 0 0 0.00000 0 24 - 0.00000 - - 0s 0 0 0.00000 0 42 - 0.00000 - - 0s 0 0 0.00000 0 50 - 0.00000 - - 0s 0 0 0.00000 0 72 - 0.00000 - - 0s 0 0 0.00000 0 57 - 0.00000 - - 0s 0 0 infeasible 0 - infeasible - - 0s Explored 1 nodes (1780 simplex iterations) in 0.07 seconds Thread count was 1 (of 16 available processors) Model objective exceeds cutoff Best objective -, best bound -, gap - optimal solution found: number of colors: 4