current bounds on the number of colors: 0 -- 56 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 18:43:01 2012 Optimize a model with 21644 rows, 2339 columns and 66332 nonzeros Presolve time: 0.09s Presolved: 21644 rows, 2339 columns, 66332 nonzeros Variable types: 0 continuous, 2339 integer (2339 binary) Root relaxation: objective 0.000000e+00, 180 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 (511 simplex iterations) in 0.15 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 -- 28 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 18:43:01 2012 Optimize a model with 10850 rows, 1555 columns and 33166 nonzeros Presolve time: 0.03s Presolved: 10850 rows, 1555 columns, 33166 nonzeros Variable types: 0 continuous, 1555 integer (1555 binary) Root relaxation: objective 0.000000e+00, 125 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 (672 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 -- 14 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 18:43:02 2012 Optimize a model with 5453 rows, 1163 columns and 16583 nonzeros Presolve time: 0.01s Presolved: 5453 rows, 1163 columns, 16583 nonzeros Variable types: 0 continuous, 1163 integer (1163 binary) Root relaxation: objective 0.000000e+00, 114 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 74 - 0.00000 - - 0s 0 0 0.00000 0 58 - 0.00000 - - 0s 0 0 infeasible 0 - 0.10000 - - 0s Explored 0 nodes (2802 simplex iterations) in 0.40 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: 7 -- 14 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 18:43:02 2012 Optimize a model with 7766 rows, 1331 columns and 23690 nonzeros Presolve time: 0.02s Presolved: 7766 rows, 1331 columns, 23690 nonzeros Variable types: 0 continuous, 1331 integer (1331 binary) Root relaxation: objective 0.000000e+00, 124 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 40 - 0.00000 - - 0s 0 0 0.00000 0 73 - 0.00000 - - 0s 0 0 0.00000 0 62 - 0.00000 - - 1s 0 0 0.00000 0 189 - 0.00000 - - 1s 0 0 0.00000 0 80 - 0.00000 - - 1s 0 0 0.00000 0 123 - 0.00000 - - 2s 0 0 0.00000 0 122 - 0.00000 - - 3s 0 0 0.00000 0 139 - 0.00000 - - 3s 0 0 0.00000 0 190 - 0.00000 - - 4s 0 0 0.00000 0 102 - 0.00000 - - 4s 0 0 0.00000 0 206 - 0.00000 - - 5s 0 0 0.00000 0 206 - 0.00000 - - 6s 0 2 0.00000 0 206 - 0.00000 - - 6s 442 26 0.00000 17 103 - 0.00000 - 78.2 10s 705 29 0.00000 24 87 - 0.00000 - 81.4 15s 709 31 0.00000 13 71 - 0.00000 - 81.0 20s * 710 30 15 0.0000000 0.00000 0.0% 80.9 22s Cutting planes: Gomory: 34 Cover: 2 Clique: 30 Zero half: 261 Explored 710 nodes (128487 simplex iterations) in 22.97 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: 7 -- 10 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 18:43:25 2012 Optimize a model with 6224 rows, 1219 columns and 18952 nonzeros Presolve time: 0.02s Presolved: 6224 rows, 1219 columns, 18952 nonzeros Variable types: 0 continuous, 1219 integer (1219 binary) Root relaxation: objective 0.000000e+00, 128 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 54 - 0.00000 - - 0s 0 0 0.00000 0 42 - 0.00000 - - 0s 0 0 0.00000 0 280 - 0.00000 - - 1s 0 0 0.00000 0 335 - 0.00000 - - 1s 0 0 0.00000 0 290 - 0.00000 - - 2s 0 0 0.00000 0 316 - 0.00000 - - 4s 0 0 0.00000 0 280 - 0.00000 - - 5s 0 0 0.00000 0 284 - 0.00000 - - 6s 0 0 0.00000 0 284 - 0.00000 - - 7s 0 2 0.00000 0 284 - 0.00000 - - 8s Cutting planes: Clique: 119 Zero half: 1 Explored 19 nodes (40422 simplex iterations) in 9.26 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: 8 -- 10 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 18:43:35 2012 Optimize a model with 6995 rows, 1275 columns and 21321 nonzeros Presolve time: 0.02s Presolved: 6995 rows, 1275 columns, 21321 nonzeros Variable types: 0 continuous, 1275 integer (1275 binary) Root relaxation: objective 0.000000e+00, 122 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 50 - 0.00000 - - 0s 0 0 0.00000 0 26 - 0.00000 - - 0s 0 0 0.00000 0 212 - 0.00000 - - 1s 0 0 0.00000 0 271 - 0.00000 - - 1s 0 0 0.00000 0 196 - 0.00000 - - 2s 0 0 0.00000 0 164 - 0.00000 - - 4s 0 0 0.00000 0 176 - 0.00000 - - 5s 0 0 0.00000 0 189 - 0.00000 - - 6s 0 0 0.00000 0 193 - 0.00000 - - 7s 0 0 0.00000 0 193 - 0.00000 - - 7s 0 2 0.00000 0 193 - 0.00000 - - 8s 38 4 0.00000 9 182 - 0.00000 - 227 10s Cutting planes: Clique: 165 Zero half: 5 Explored 75 nodes (54211 simplex iterations) in 11.04 seconds Thread count was 1 (of 16 available processors) Model objective exceeds cutoff Best objective -, best bound -, gap - optimal solution found: number of colors: 10