current bounds on the number of colors: 0 -- 159 Gurobi 5.0.1 (linux64) logging started Fri Dec 14 19:14:02 2012 Optimize a model with 53247 rows, 13233 columns and 171825 nonzeros Presolve time: 0.17s Presolved: 53247 rows, 13233 columns, 171825 nonzeros Variable types: 0 continuous, 13233 integer (13233 binary) Root relaxation: objective 0.000000e+00, 561 iterations, 0.05 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 (947 simplex iterations) in 0.30 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 -- 79 Gurobi 5.0.1 (linux64) logging started Fri Dec 14 19:14:03 2012 Optimize a model with 26367 rows, 6873 columns and 84825 nonzeros Presolve time: 0.13s Presolved: 26367 rows, 6873 columns, 84825 nonzeros Variable types: 0 continuous, 6873 integer (6873 binary) Root relaxation: objective 0.000000e+00, 527 iterations, 0.03 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 (871 simplex iterations) in 0.20 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 -- 39 Gurobi 5.0.1 (linux64) logging started Fri Dec 14 19:14:03 2012 Optimize a model with 12927 rows, 3693 columns and 41325 nonzeros Presolve time: 0.05s Presolved: 12927 rows, 3693 columns, 41325 nonzeros Variable types: 0 continuous, 3693 integer (3693 binary) Root relaxation: objective 0.000000e+00, 335 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 (602 simplex iterations) in 0.07 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 -- 19 Gurobi 5.0.1 (linux64) logging started Fri Dec 14 19:14:03 2012 Optimize a model with 6207 rows, 2103 columns and 19575 nonzeros Presolve time: 0.02s Presolved: 6207 rows, 2103 columns, 19575 nonzeros Variable types: 0 continuous, 2103 integer (2103 binary) Root relaxation: objective 0.000000e+00, 340 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 (848 simplex iterations) in 0.04 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 Fri Dec 14 19:14:03 2012 Optimize a model with 2847 rows, 1308 columns and 8700 nonzeros Presolve time: 0.01s Presolved: 2847 rows, 1308 columns, 8700 nonzeros Variable types: 0 continuous, 1308 integer (1308 binary) Root relaxation: objective 0.000000e+00, 346 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 0 292 - 0.00000 - - 0s 0 0 0.00000 0 288 - 0.00000 - - 0s 0 0 0.00000 0 286 - 0.00000 - - 0s 0 0 0.00000 0 310 - 0.00000 - - 0s 0 0 0.00000 0 278 - 0.00000 - - 0s 0 0 0.00000 0 266 - 0.00000 - - 0s 0 0 0.00000 0 268 - 0.00000 - - 1s 0 0 0.00000 0 252 - 0.00000 - - 1s 0 0 0.00000 0 254 - 0.00000 - - 1s 0 0 0.00000 0 254 - 0.00000 - - 1s 0 0 0.00000 0 254 - 0.00000 - - 1s 0 2 0.00000 0 254 - 0.00000 - - 2s 733 18 infeasible 16 - 0.00000 - 88.1 5s 1307 32 0.00000 5 260 - 0.00000 - 90.6 10s 1315 37 0.00000 12 239 - 0.00000 - 90.1 15s * 1566 5 27 0.0000000 0.00000 0.0% 120 17s Cutting planes: Gomory: 1 Zero half: 11 Explored 1567 nodes (210411 simplex iterations) in 17.35 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 Fri Dec 14 19:14:21 2012 Optimize a model with 1503 rows, 990 columns and 4350 nonzeros Presolve removed 159 rows and 159 columns Presolve time: 0.00s Presolved: 1344 rows, 831 columns, 4032 nonzeros Variable types: 0 continuous, 831 integer (831 binary) Root relaxation: objective 0.000000e+00, 170 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 0 159 - 0.00000 - - 0s Explored 0 nodes (673 simplex iterations) in 0.02 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 Fri Dec 14 19:14:21 2012 Optimize a model with 2175 rows, 1149 columns and 6525 nonzeros Presolve time: 0.01s Presolved: 2175 rows, 1149 columns, 6525 nonzeros Variable types: 0 continuous, 1149 integer (1149 binary) Root relaxation: objective 0.000000e+00, 391 iterations, 0.01 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 0.00000 0 226 - 0.00000 - - 0s 0 0 0.00000 0 349 - 0.00000 - - 0s 0 0 0.00000 0 432 - 0.00000 - - 0s 0 0 infeasible 0 - 0.10000 - - 0s Cutting planes: Gomory: 22 Zero half: 384 Explored 0 nodes (8202 simplex iterations) in 0.81 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