current bounds on the number of colors: 0 -- 54 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 19:36:34 2012 Optimize a model with 3996 rows, 1604 columns and 13284 nonzeros Presolve removed 1 rows and 27 columns Presolve time: 0.02s Presolved: 3995 rows, 1577 columns, 13257 nonzeros Variable types: 0 continuous, 1577 integer (1577 binary) Root relaxation: objective 0.000000e+00, 123 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 (217 simplex iterations) in 0.03 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 Thu Dec 13 19:36:34 2012 Optimize a model with 1952 rows, 848 columns and 6396 nonzeros Presolve removed 1 rows and 13 columns Presolve time: 0.01s Presolved: 1951 rows, 835 columns, 6383 nonzeros Variable types: 0 continuous, 835 integer (835 binary) Root relaxation: objective 0.000000e+00, 111 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 (196 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 Thu Dec 13 19:36:34 2012 Optimize a model with 930 rows, 470 columns and 2952 nonzeros Presolve removed 1 rows and 6 columns Presolve time: 0.00s Presolved: 929 rows, 464 columns, 2946 nonzeros Variable types: 0 continuous, 464 integer (464 binary) Root relaxation: objective 0.000000e+00, 117 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 (195 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 -- 6 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 19:36:34 2012 Optimize a model with 492 rows, 308 columns and 1476 nonzeros Presolve removed 1 rows and 3 columns Presolve time: 0.00s Presolved: 491 rows, 305 columns, 1473 nonzeros Variable types: 0 continuous, 305 integer (305 binary) Root relaxation: objective 0.000000e+00, 123 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 0 104 - 0.00000 - - 0s 0 0 0.00000 0 82 - 0.00000 - - 0s 0 0 0.00000 0 70 - 0.00000 - - 0s 0 0 0.00000 0 123 - 0.00000 - - 0s 0 0 0.00000 0 125 - 0.00000 - - 0s 0 0 0.00000 0 102 - 0.00000 - - 0s 0 0 0.00000 0 66 - 0.00000 - - 0s 0 0 0.00000 0 129 - 0.00000 - - 0s 0 0 0.00000 0 101 - 0.00000 - - 0s 0 0 0.00000 0 104 - 0.00000 - - 0s 0 0 0.00000 0 104 - 0.00000 - - 0s 0 2 0.00000 0 104 - 0.00000 - - 0s Cutting planes: Zero half: 12 Explored 5 nodes (4775 simplex iterations) in 0.20 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: 3 -- 6 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 19:36:34 2012 Optimize a model with 638 rows, 362 columns and 1968 nonzeros Presolve removed 1 rows and 4 columns Presolve time: 0.00s Presolved: 637 rows, 358 columns, 1964 nonzeros Variable types: 0 continuous, 358 integer (358 binary) Root relaxation: objective 0.000000e+00, 124 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 (304 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