current bounds on the number of colors: 0 -- 40 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 17:59:40 2012 Optimize a model with 8040 rows, 1200 columns and 24800 nonzeros Presolve time: 0.03s Presolved: 8040 rows, 1200 columns, 24800 nonzeros Variable types: 0 continuous, 1200 integer (1200 binary) Root relaxation: objective 0.000000e+00, 101 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 (307 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 -- 20 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 17:59:41 2012 Optimize a model with 4040 rows, 800 columns and 12400 nonzeros Presolve time: 0.01s Presolved: 4040 rows, 800 columns, 12400 nonzeros Variable types: 0 continuous, 800 integer (800 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 0.00000 0 30 - 0.00000 - - 0s H 0 0 0.0000000 0.00000 0.0% - 0s Explored 0 nodes (766 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 -- 10 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 17:59:41 2012 Optimize a model with 2040 rows, 600 columns and 6200 nonzeros Presolve time: 0.00s Presolved: 2040 rows, 600 columns, 6200 nonzeros Variable types: 0 continuous, 600 integer (600 binary) Root relaxation: objective 0.000000e+00, 80 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 60 - 0.00000 - - 0s 0 0 0.00000 0 58 - 0.00000 - - 0s 0 0 infeasible 0 - 0.10000 - - 0s Explored 0 nodes (1632 simplex iterations) in 0.15 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: 5 -- 10 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 17:59:41 2012 Optimize a model with 2840 rows, 680 columns and 8680 nonzeros Presolve time: 0.01s Presolved: 2840 rows, 680 columns, 8680 nonzeros Variable types: 0 continuous, 680 integer (680 binary) Root relaxation: objective 0.000000e+00, 80 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 30 - 0.00000 - - 0s 0 0 0.00000 0 40 - 0.00000 - - 0s 0 0 0.00000 0 154 - 0.00000 - - 0s 0 0 0.00000 0 193 - 0.00000 - - 0s 0 0 0.00000 0 135 - 0.00000 - - 0s 0 0 0.00000 0 168 - 0.00000 - - 0s 0 0 0.00000 0 170 - 0.00000 - - 1s 0 0 0.00000 0 170 - 0.00000 - - 1s 0 2 0.00000 0 170 - 0.00000 - - 1s Cutting planes: Clique: 56 Zero half: 3 Explored 13 nodes (14198 simplex iterations) in 1.61 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: 7 -- 10 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 17:59:43 2012 Optimize a model with 3240 rows, 720 columns and 9920 nonzeros Presolve time: 0.01s Presolved: 3240 rows, 720 columns, 9920 nonzeros Variable types: 0 continuous, 720 integer (720 binary) Root relaxation: objective 0.000000e+00, 80 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 40 - 0.00000 - - 0s 0 0 0.00000 0 51 - 0.00000 - - 0s 0 0 0.00000 0 20 - 0.00000 - - 0s 0 0 0.00000 0 86 - 0.00000 - - 0s 0 0 0.00000 0 20 - 0.00000 - - 0s 0 0 0.00000 0 20 - 0.00000 - - 0s * 0 0 0 0.0000000 0.00000 0.0% - 0s Cutting planes: Clique: 4 Zero half: 4 Explored 0 nodes (7444 simplex iterations) in 0.61 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: 8