current bounds on the number of colors: 0 -- 56 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 18:50:43 2012 Optimize a model with 21560 rows, 2336 columns and 66080 nonzeros Presolve time: 0.09s Presolved: 21560 rows, 2336 columns, 66080 nonzeros Variable types: 0 continuous, 2336 integer (2336 binary) Root relaxation: objective 0.000000e+00, 202 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 (494 simplex iterations) in 0.16 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 18:50:44 2012 Optimize a model with 10808 rows, 1552 columns and 33040 nonzeros Presolve time: 0.03s Presolved: 10808 rows, 1552 columns, 33040 nonzeros Variable types: 0 continuous, 1552 integer (1552 binary) Root relaxation: objective 0.000000e+00, 127 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 (1058 simplex iterations) in 0.11 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 18:50:44 2012 Optimize a model with 5432 rows, 1160 columns and 16520 nonzeros Presolve time: 0.01s Presolved: 5432 rows, 1160 columns, 16520 nonzeros Variable types: 0 continuous, 1160 integer (1160 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 66 - 0.00000 - - 0s 0 0 0.00000 0 60 - 0.00000 - - 0s 0 0 infeasible 0 - 0.10000 - - 0s Explored 0 nodes (3273 simplex iterations) in 0.43 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 18:50:44 2012 Optimize a model with 7736 rows, 1328 columns and 23600 nonzeros Presolve time: 0.02s Presolved: 7736 rows, 1328 columns, 23600 nonzeros Variable types: 0 continuous, 1328 integer (1328 binary) Root relaxation: objective 0.000000e+00, 118 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 58 - 0.00000 - - 0s 0 0 0.00000 0 80 - 0.00000 - - 0s 0 0 0.00000 0 189 - 0.00000 - - 1s 0 0 0.00000 0 231 - 0.00000 - - 1s 0 0 0.00000 0 204 - 0.00000 - - 2s 0 0 0.00000 0 177 - 0.00000 - - 3s 0 0 0.00000 0 144 - 0.00000 - - 4s 0 0 0.00000 0 144 - 0.00000 - - 4s 0 0 0.00000 0 121 - 0.00000 - - 5s 0 0 0.00000 0 167 - 0.00000 - - 6s 0 0 0.00000 0 186 - 0.00000 - - 7s 0 0 0.00000 0 186 - 0.00000 - - 8s 0 2 0.00000 0 186 - 0.00000 - - 8s 91 11 infeasible 16 - 0.00000 - 114 10s 903 30 0.00000 15 189 - 0.00000 - 75.3 15s 907 33 0.00000 18 89 - 0.00000 - 75.0 21s 910 35 0.00000 16 193 - 0.00000 - 74.8 25s 921 38 0.00000 13 173 - 0.00000 - 118 30s 1271 32 0.00000 30 104 - 0.00000 - 119 35s 1765 36 0.00000 23 137 - 0.00000 - 122 40s 2316 29 0.00000 28 117 - 0.00000 - 122 45s 2773 18 0.00000 27 86 - 0.00000 - 125 50s 3280 11 infeasible 26 - 0.00000 - 125 55s 3664 11 0.00000 24 137 - 0.00000 - 127 60s 4062 13 infeasible 26 - 0.00000 - 129 65s 4443 4 infeasible 25 - 0.00000 - 131 70s 4943 14 0.00000 27 122 - 0.00000 - 131 75s 5460 9 0.00000 25 111 - 0.00000 - 131 80s 5929 10 0.00000 24 128 - 0.00000 - 132 85s 6408 7 0.00000 22 107 - 0.00000 - 132 90s 6812 9 infeasible 26 - 0.00000 - 133 95s * 6846 2 28 0.0000000 0.00000 0.0% 133 95s Cutting planes: Clique: 27 Zero half: 2 Explored 6847 nodes (954954 simplex iterations) in 95.29 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 18:52:20 2012 Optimize a model with 6200 rows, 1216 columns and 18880 nonzeros Presolve time: 0.02s Presolved: 6200 rows, 1216 columns, 18880 nonzeros Variable types: 0 continuous, 1216 integer (1216 binary) Root relaxation: objective 0.000000e+00, 130 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 62 - 0.00000 - - 0s 0 0 0.00000 0 68 - 0.00000 - - 0s 0 0 0.00000 0 261 - 0.00000 - - 1s 0 0 0.00000 0 330 - 0.00000 - - 1s 0 0 0.00000 0 302 - 0.00000 - - 3s 0 0 0.00000 0 278 - 0.00000 - - 4s 0 0 0.00000 0 259 - 0.00000 - - 7s 0 0 0.00000 0 312 - 0.00000 - - 8s 0 0 0.00000 0 308 - 0.00000 - - 10s 0 0 0.00000 0 296 - 0.00000 - - 11s 0 0 0.00000 0 297 - 0.00000 - - 13s 0 0 0.00000 0 342 - 0.00000 - - 15s 0 0 0.00000 0 342 - 0.00000 - - 15s 0 2 0.00000 0 341 - 0.00000 - - 17s Cutting planes: Clique: 146 Zero half: 1 Explored 19 nodes (69928 simplex iterations) in 18.29 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 18:52:38 2012 Optimize a model with 6968 rows, 1272 columns and 21240 nonzeros Presolve time: 0.02s Presolved: 6968 rows, 1272 columns, 21240 nonzeros Variable types: 0 continuous, 1272 integer (1272 binary) Root relaxation: objective 0.000000e+00, 118 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 34 - 0.00000 - - 0s 0 0 0.00000 0 184 - 0.00000 - - 1s 0 0 0.00000 0 261 - 0.00000 - - 1s 0 0 0.00000 0 163 - 0.00000 - - 2s 0 0 0.00000 0 232 - 0.00000 - - 3s 0 0 0.00000 0 257 - 0.00000 - - 4s 0 0 0.00000 0 228 - 0.00000 - - 5s 0 0 0.00000 0 240 - 0.00000 - - 6s 0 0 0.00000 0 240 - 0.00000 - - 7s 0 2 0.00000 0 240 - 0.00000 - - 8s 77 7 0.00000 9 197 - 0.00000 - 190 10s Cutting planes: Clique: 208 Zero half: 2 Explored 115 nodes (61430 simplex iterations) in 10.95 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