current bounds on the number of colors: 0 -- 163 Gurobi 5.0.1 (linux64) logging started Fri Dec 14 19:44:54 2012 Optimize a model with 53461 rows, 13861 columns and 173097 nonzeros Presolve time: 0.17s Presolved: 53461 rows, 13861 columns, 173097 nonzeros Variable types: 0 continuous, 13861 integer (13861 binary) Root relaxation: objective 0.000000e+00, 603 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 (961 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 -- 81 Gurobi 5.0.1 (linux64) logging started Fri Dec 14 19:44:55 2012 Optimize a model with 26483 rows, 7178 columns and 85480 nonzeros Presolve time: 0.13s Presolved: 26483 rows, 7178 columns, 85480 nonzeros Variable types: 0 continuous, 7178 integer (7178 binary) Root relaxation: objective 0.000000e+00, 448 iterations, 0.02 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 (776 simplex iterations) in 0.19 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 -- 40 Gurobi 5.0.1 (linux64) logging started Fri Dec 14 19:44:55 2012 Optimize a model with 13323 rows, 3918 columns and 42740 nonzeros Presolve time: 0.05s Presolved: 13323 rows, 3918 columns, 42740 nonzeros Variable types: 0 continuous, 3918 integer (3918 binary) Root relaxation: objective 0.000000e+00, 343 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 (619 simplex iterations) in 0.08 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 Fri Dec 14 19:44:56 2012 Optimize a model with 6743 rows, 2288 columns and 21370 nonzeros Presolve time: 0.02s Presolved: 6743 rows, 2288 columns, 21370 nonzeros Variable types: 0 continuous, 2288 integer (2288 binary) Root relaxation: objective 0.000000e+00, 360 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 (680 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 -- 10 Gurobi 5.0.1 (linux64) logging started Fri Dec 14 19:44:56 2012 Optimize a model with 3453 rows, 1473 columns and 10685 nonzeros Presolve time: 0.01s Presolved: 3453 rows, 1473 columns, 10685 nonzeros Variable types: 0 continuous, 1473 integer (1473 binary) Root relaxation: objective 0.000000e+00, 363 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 (1432 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 -- 5 Gurobi 5.0.1 (linux64) logging started Fri Dec 14 19:44:56 2012 Optimize a model with 1479 rows, 984 columns and 4274 nonzeros Presolve removed 163 rows and 163 columns Presolve time: 0.00s Presolved: 1316 rows, 821 columns, 3948 nonzeros Variable types: 0 continuous, 821 integer (821 binary) Root relaxation: objective 0.000000e+00, 173 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 0 163 - 0.00000 - - 0s Explored 0 nodes (708 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 -- 5 Gurobi 5.0.1 (linux64) logging started Fri Dec 14 19:44:56 2012 Optimize a model with 2137 rows, 1147 columns and 6411 nonzeros Presolve time: 0.01s Presolved: 2137 rows, 1147 columns, 6411 nonzeros Variable types: 0 continuous, 1147 integer (1147 binary) Root relaxation: objective 0.000000e+00, 385 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 0 268 - 0.00000 - - 0s 0 0 0.00000 0 378 - 0.00000 - - 0s 0 0 0.00000 0 433 - 0.00000 - - 0s 0 0 infeasible 0 - 0.10000 - - 0s Cutting planes: Gomory: 13 Zero half: 638 Explored 0 nodes (8293 simplex iterations) in 0.86 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: 3 -- 5 Gurobi 5.0.1 (linux64) logging started Fri Dec 14 19:44:57 2012 Optimize a model with 2795 rows, 1310 columns and 8548 nonzeros Presolve time: 0.01s Presolved: 2795 rows, 1310 columns, 8548 nonzeros Variable types: 0 continuous, 1310 integer (1310 binary) Root relaxation: objective 0.000000e+00, 367 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 0 312 - 0.00000 - - 0s 0 0 0.00000 0 298 - 0.00000 - - 0s 0 0 0.00000 0 282 - 0.00000 - - 0s 0 0 0.00000 0 382 - 0.00000 - - 0s 0 0 0.00000 0 336 - 0.00000 - - 0s 0 0 0.00000 0 350 - 0.00000 - - 1s 0 0 0.00000 0 351 - 0.00000 - - 1s 0 0 0.00000 0 354 - 0.00000 - - 2s 0 0 0.00000 0 353 - 0.00000 - - 2s 0 2 0.00000 0 346 - 0.00000 - - 2s 625 37 0.00000 18 250 - 0.00000 - 84.9 5s 710 54 0.00000 24 320 - 0.00000 - 82.6 10s 719 60 infeasible 11 - 0.00000 - 127 15s 1216 76 0.00000 24 330 - 0.00000 - 141 20s * 1268 0 28 0.0000000 0.00000 0.0% 142 20s Cutting planes: Gomory: 3 Zero half: 18 Explored 1269 nodes (202320 simplex iterations) in 20.45 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