current bounds on the number of colors: 0 -- 68 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 19:37:53 2012 Optimize a model with 8704 rows, 2566 columns and 28220 nonzeros Presolve time: 0.04s Presolved: 8704 rows, 2566 columns, 28220 nonzeros Variable types: 0 continuous, 2566 integer (2566 binary) Root relaxation: objective 0.000000e+00, 169 iterations, 0.01 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 (330 simplex iterations) in 0.06 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 -- 34 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 19:37:53 2012 Optimize a model with 4386 rows, 1410 columns and 14110 nonzeros Presolve time: 0.02s Presolved: 4386 rows, 1410 columns, 14110 nonzeros Variable types: 0 continuous, 1410 integer (1410 binary) Root relaxation: objective 0.000000e+00, 143 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 (333 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 -- 17 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 19:37:53 2012 Optimize a model with 2100 rows, 798 columns and 6640 nonzeros Presolve time: 0.01s Presolved: 2100 rows, 798 columns, 6640 nonzeros Variable types: 0 continuous, 798 integer (798 binary) Root relaxation: objective 0.000000e+00, 150 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 (262 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 -- 8 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 19:37:53 2012 Optimize a model with 1084 rows, 526 columns and 3320 nonzeros Presolve time: 0.00s Presolved: 1084 rows, 526 columns, 3320 nonzeros Variable types: 0 continuous, 526 integer (526 binary) Root relaxation: objective 0.000000e+00, 153 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 0 105 - 0.00000 - - 0s H 0 0 0.0000000 0.00000 0.0% - 0s Explored 0 nodes (930 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 -- 4 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 19:37:53 2012 Optimize a model with 576 rows, 390 columns and 1660 nonzeros Presolve removed 68 rows and 68 columns Presolve time: 0.00s Presolved: 508 rows, 322 columns, 1524 nonzeros Variable types: 0 continuous, 322 integer (322 binary) Root relaxation: objective 0.000000e+00, 69 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 infeasible 0 - 0.10000 - - 0s Explored 0 nodes (279 simplex iterations) in 0.01 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 19:37:53 2012 Optimize a model with 830 rows, 458 columns and 2490 nonzeros Presolve time: 0.00s Presolved: 830 rows, 458 columns, 2490 nonzeros Variable types: 0 continuous, 458 integer (458 binary) Root relaxation: objective 0.000000e+00, 149 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 0 102 - 0.00000 - - 0s 0 0 0.00000 0 148 - 0.00000 - - 0s 0 0 infeasible 0 - 0.10000 - - 0s Explored 0 nodes (1689 simplex iterations) in 0.08 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: 4