current bounds on the number of colors: 0 -- 165 Gurobi 5.0.1 (linux64) logging started Fri Dec 14 19:59:20 2012 Optimize a model with 55925 rows, 14210 columns and 180810 nonzeros Presolve time: 0.17s Presolved: 55925 rows, 14210 columns, 180810 nonzeros Variable types: 0 continuous, 14210 integer (14210 binary) Root relaxation: objective 0.000000e+00, 582 iterations, 0.04 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 (1153 simplex iterations) in 0.34 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 19:59:21 2012 Optimize a model with 28045 rows, 7445 columns and 90405 nonzeros Presolve time: 0.14s Presolved: 28045 rows, 7445 columns, 90405 nonzeros Variable types: 0 continuous, 7445 integer (7445 binary) Root relaxation: objective 0.000000e+00, 424 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 (741 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 -- 41 Gurobi 5.0.1 (linux64) logging started Fri Dec 14 19:59:21 2012 Optimize a model with 13765 rows, 3980 columns and 44100 nonzeros Presolve time: 0.05s Presolved: 13765 rows, 3980 columns, 44100 nonzeros Variable types: 0 continuous, 3980 integer (3980 binary) Root relaxation: objective 0.000000e+00, 339 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 (629 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 19:59:22 2012 Optimize a model with 6965 rows, 2330 columns and 22050 nonzeros Presolve time: 0.02s Presolved: 6965 rows, 2330 columns, 22050 nonzeros Variable types: 0 continuous, 2330 integer (2330 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 0.0000000 0.00000 0.0% - 0s Explored 0 nodes (658 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 19:59:22 2012 Optimize a model with 3565 rows, 1505 columns and 11025 nonzeros Presolve time: 0.01s Presolved: 3565 rows, 1505 columns, 11025 nonzeros Variable types: 0 continuous, 1505 integer (1505 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 (1196 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 -- 5 Gurobi 5.0.1 (linux64) logging started Fri Dec 14 19:59:22 2012 Optimize a model with 1525 rows, 1010 columns and 4410 nonzeros Presolve removed 165 rows and 165 columns Presolve time: 0.00s Presolved: 1360 rows, 845 columns, 4080 nonzeros Variable types: 0 continuous, 845 integer (845 binary) Root relaxation: objective 0.000000e+00, 179 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 0 165 - 0.00000 - - 0s Explored 0 nodes (713 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 19:59:22 2012 Optimize a model with 2205 rows, 1175 columns and 6615 nonzeros Presolve time: 0.01s Presolved: 2205 rows, 1175 columns, 6615 nonzeros Variable types: 0 continuous, 1175 integer (1175 binary) Root relaxation: objective 0.000000e+00, 412 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 0 324 - 0.00000 - - 0s 0 0 0.00000 0 322 - 0.00000 - - 0s 0 0 0.00000 0 436 - 0.00000 - - 0s 0 0 infeasible 0 - 0.10000 - - 0s Cutting planes: Gomory: 13 Zero half: 430 Explored 0 nodes (6606 simplex iterations) in 0.73 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 19:59:23 2012 Optimize a model with 2885 rows, 1340 columns and 8820 nonzeros Presolve time: 0.01s Presolved: 2885 rows, 1340 columns, 8820 nonzeros Variable types: 0 continuous, 1340 integer (1340 binary) Root relaxation: objective 0.000000e+00, 362 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 0 302 - 0.00000 - - 0s 0 0 0.00000 0 298 - 0.00000 - - 0s 0 0 0.00000 0 296 - 0.00000 - - 0s 0 0 0.00000 0 298 - 0.00000 - - 0s 0 0 0.00000 0 297 - 0.00000 - - 0s 0 0 0.00000 0 286 - 0.00000 - - 0s 0 0 0.00000 0 282 - 0.00000 - - 1s 0 0 0.00000 0 278 - 0.00000 - - 1s 0 0 0.00000 0 275 - 0.00000 - - 1s 0 0 0.00000 0 268 - 0.00000 - - 1s 0 0 0.00000 0 272 - 0.00000 - - 2s 0 0 0.00000 0 272 - 0.00000 - - 2s 0 0 0.00000 0 272 - 0.00000 - - 2s 0 2 0.00000 0 272 - 0.00000 - - 2s 606 74 0.00000 26 326 - 0.00000 - 71.6 5s 612 78 0.00000 22 352 - 0.00000 - 70.9 10s 1143 149 0.00000 28 240 - 0.00000 - 121 15s * 1501 0 39 0.0000000 0.00000 0.0% 125 17s Cutting planes: Gomory: 2 Zero half: 11 Explored 1502 nodes (214867 simplex iterations) in 17.52 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