current bounds on the number of colors: 0 -- 164 Gurobi 5.0.1 (linux64) logging started Fri Dec 14 19:53:39 2012 Optimize a model with 56580 rows, 14136 columns and 182696 nonzeros Presolve time: 0.17s Presolved: 56580 rows, 14136 columns, 182696 nonzeros Variable types: 0 continuous, 14136 integer (14136 binary) Root relaxation: objective 0.000000e+00, 592 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 (969 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 -- 82 Gurobi 5.0.1 (linux64) logging started Fri Dec 14 19:53:40 2012 Optimize a model with 28372 rows, 7412 columns and 91348 nonzeros Presolve time: 0.14s Presolved: 28372 rows, 7412 columns, 91348 nonzeros Variable types: 0 continuous, 7412 integer (7412 binary) Root relaxation: objective 0.000000e+00, 518 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 (873 simplex iterations) in 0.21 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 -- 41 Gurobi 5.0.1 (linux64) logging started Fri Dec 14 19:53:41 2012 Optimize a model with 13924 rows, 3968 columns and 44560 nonzeros Presolve time: 0.05s Presolved: 13924 rows, 3968 columns, 44560 nonzeros Variable types: 0 continuous, 3968 integer (3968 binary) Root relaxation: objective 0.000000e+00, 349 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 (869 simplex iterations) in 0.09 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 19:53:41 2012 Optimize a model with 7044 rows, 2328 columns and 22280 nonzeros Presolve time: 0.02s Presolved: 7044 rows, 2328 columns, 22280 nonzeros Variable types: 0 continuous, 2328 integer (2328 binary) Root relaxation: objective 0.000000e+00, 352 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 19:53:41 2012 Optimize a model with 3604 rows, 1508 columns and 11140 nonzeros Presolve time: 0.01s Presolved: 3604 rows, 1508 columns, 11140 nonzeros Variable types: 0 continuous, 1508 integer (1508 binary) Root relaxation: objective 0.000000e+00, 370 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 (2431 simplex iterations) in 0.12 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 19:53:41 2012 Optimize a model with 1540 rows, 1016 columns and 4456 nonzeros Presolve removed 164 rows and 164 columns Presolve time: 0.00s Presolved: 1376 rows, 852 columns, 4128 nonzeros Variable types: 0 continuous, 852 integer (852 binary) Root relaxation: objective 0.000000e+00, 174 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 0 164 - 0.00000 - - 0s 0 0 infeasible 0 - 0.10000 - - 0s Explored 0 nodes (697 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 19:53:42 2012 Optimize a model with 2228 rows, 1180 columns and 6684 nonzeros Presolve time: 0.01s Presolved: 2228 rows, 1180 columns, 6684 nonzeros Variable types: 0 continuous, 1180 integer (1180 binary) Root relaxation: objective 0.000000e+00, 398 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 0 326 - 0.00000 - - 0s 0 0 0.00000 0 322 - 0.00000 - - 0s 0 0 0.00000 0 450 - 0.00000 - - 0s 0 0 infeasible 0 - 0.10000 - - 0s Cutting planes: Gomory: 26 Clique: 1 Zero half: 376 Explored 0 nodes (5749 simplex iterations) in 0.71 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 19:53:42 2012 Optimize a model with 2916 rows, 1344 columns and 8912 nonzeros Presolve time: 0.01s Presolved: 2916 rows, 1344 columns, 8912 nonzeros Variable types: 0 continuous, 1344 integer (1344 binary) Root relaxation: objective 0.000000e+00, 373 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 0 316 - 0.00000 - - 0s 0 0 0.00000 0 304 - 0.00000 - - 0s 0 0 0.00000 0 258 - 0.00000 - - 0s 0 0 0.00000 0 254 - 0.00000 - - 0s 0 0 0.00000 0 306 - 0.00000 - - 0s 0 0 0.00000 0 226 - 0.00000 - - 0s 0 0 0.00000 0 217 - 0.00000 - - 1s 0 0 0.00000 0 224 - 0.00000 - - 1s 0 0 0.00000 0 200 - 0.00000 - - 1s 0 0 0.00000 0 206 - 0.00000 - - 1s 0 0 0.00000 0 200 - 0.00000 - - 1s 0 0 0.00000 0 198 - 0.00000 - - 2s 0 0 0.00000 0 198 - 0.00000 - - 2s 0 0 0.00000 0 200 - 0.00000 - - 2s 0 0 0.00000 0 200 - 0.00000 - - 2s 0 2 0.00000 0 200 - 0.00000 - - 3s 366 80 0.00000 22 282 - 0.00000 - 91.3 5s 612 102 0.00000 16 272 - 0.00000 - 85.8 10s 1017 156 infeasible 27 - 0.00000 - 138 15s 1664 293 0.00000 25 276 - 0.00000 - 141 20s 2282 365 infeasible 33 - 0.00000 - 145 25s 2911 388 0.00000 28 272 - 0.00000 - 147 30s 3520 407 infeasible 31 - 0.00000 - 148 35s 4140 423 0.00000 29 301 - 0.00000 - 150 40s 4742 411 0.00000 31 313 - 0.00000 - 152 45s 5305 424 0.00000 29 256 - 0.00000 - 154 50s 5871 426 infeasible 35 - 0.00000 - 155 55s 6482 427 0.00000 33 268 - 0.00000 - 156 60s 7061 430 infeasible 37 - 0.00000 - 157 65s 7620 403 0.00000 32 314 - 0.00000 - 158 70s 8245 404 infeasible 39 - 0.00000 - 158 75s * 8397 0 32 0.0000000 0.00000 0.0% 158 76s Cutting planes: Gomory: 2 Zero half: 16 Explored 8398 nodes (1359367 simplex iterations) in 76.19 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% optimal solution found: number of colors: 4