current bounds on the number of colors: 0 -- 56 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 18:43:46 2012 Optimize a model with 20692 rows, 2305 columns and 63476 nonzeros Presolve time: 0.09s Presolved: 20692 rows, 2305 columns, 63476 nonzeros Variable types: 0 continuous, 2305 integer (2305 binary) Root relaxation: objective 0.000000e+00, 174 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 (580 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 18:43:47 2012 Optimize a model with 10374 rows, 1521 columns and 31738 nonzeros Presolve time: 0.03s Presolved: 10374 rows, 1521 columns, 31738 nonzeros Variable types: 0 continuous, 1521 integer (1521 binary) Root relaxation: objective 0.000000e+00, 123 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 (1065 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 18:43:47 2012 Optimize a model with 5215 rows, 1129 columns and 15869 nonzeros Presolve time: 0.01s Presolved: 5215 rows, 1129 columns, 15869 nonzeros Variable types: 0 continuous, 1129 integer (1129 binary) Root relaxation: objective 0.000000e+00, 113 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 60 - 0.00000 - - 0s 0 0 0.00000 0 56 - 0.00000 - - 0s 0 0 0.00000 0 300 - 0.00000 - - 0s 0 0 0.00000 0 337 - 0.00000 - - 1s 0 0 0.00000 0 317 - 0.00000 - - 2s 0 0 0.00000 0 319 - 0.00000 - - 3s 0 0 0.00000 0 323 - 0.00000 - - 4s 0 0 0.00000 0 314 - 0.00000 - - 4s 0 2 0.00000 0 312 - 0.00000 - - 5s Cutting planes: Clique: 81 Zero half: 11 Explored 5 nodes (27289 simplex iterations) in 5.46 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: 7 -- 14 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 18:43:53 2012 Optimize a model with 7426 rows, 1297 columns and 22670 nonzeros Presolve time: 0.02s Presolved: 7426 rows, 1297 columns, 22670 nonzeros Variable types: 0 continuous, 1297 integer (1297 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 30 - 0.00000 - - 0s 0 0 0.00000 0 33 - 0.00000 - - 0s 0 0 0.00000 0 98 - 0.00000 - - 0s 0 0 0.00000 0 203 - 0.00000 - - 1s 0 0 0.00000 0 96 - 0.00000 - - 1s 0 0 0.00000 0 90 - 0.00000 - - 2s 0 0 0.00000 0 100 - 0.00000 - - 2s 0 0 0.00000 0 49 - 0.00000 - - 3s 0 0 0.00000 0 40 - 0.00000 - - 3s 0 0 0.00000 0 25 - 0.00000 - - 4s 0 0 0.00000 0 67 - 0.00000 - - 4s 0 0 0.00000 0 37 - 0.00000 - - 5s * 0 0 0 0.0000000 0.00000 0.0% - 5s Cutting planes: Clique: 12 Zero half: 25 Explored 0 nodes (41409 simplex iterations) in 5.72 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 18:43:58 2012 Optimize a model with 5952 rows, 1185 columns and 18136 nonzeros Presolve time: 0.02s Presolved: 5952 rows, 1185 columns, 18136 nonzeros Variable types: 0 continuous, 1185 integer (1185 binary) Root relaxation: objective 0.000000e+00, 129 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 66 - 0.00000 - - 0s 0 0 0.00000 0 243 - 0.00000 - - 1s 0 0 0.00000 0 273 - 0.00000 - - 1s 0 0 0.00000 0 225 - 0.00000 - - 2s 0 0 0.00000 0 204 - 0.00000 - - 3s 0 0 0.00000 0 255 - 0.00000 - - 4s 0 0 0.00000 0 231 - 0.00000 - - 5s 0 0 0.00000 0 260 - 0.00000 - - 6s 0 0 0.00000 0 274 - 0.00000 - - 7s 0 0 0.00000 0 274 - 0.00000 - - 7s 0 2 0.00000 0 274 - 0.00000 - - 9s Cutting planes: Clique: 140 Zero half: 1 Explored 27 nodes (48501 simplex iterations) in 9.54 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 18:44:08 2012 Optimize a model with 6689 rows, 1241 columns and 20403 nonzeros Presolve time: 0.02s Presolved: 6689 rows, 1241 columns, 20403 nonzeros Variable types: 0 continuous, 1241 integer (1241 binary) Root relaxation: objective 0.000000e+00, 123 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 0 112 - 0.00000 - - 0s 0 0 0.00000 0 46 - 0.00000 - - 0s 0 0 0.00000 0 156 - 0.00000 - - 1s 0 0 0.00000 0 188 - 0.00000 - - 1s 0 0 0.00000 0 90 - 0.00000 - - 2s 0 0 0.00000 0 173 - 0.00000 - - 2s 0 0 0.00000 0 154 - 0.00000 - - 3s 0 0 0.00000 0 165 - 0.00000 - - 4s 0 0 0.00000 0 198 - 0.00000 - - 5s 0 0 0.00000 0 198 - 0.00000 - - 5s 0 2 0.00000 0 198 - 0.00000 - - 6s 299 5 0.00000 12 144 - 0.00000 - 125 10s 811 23 infeasible 21 - 0.00000 - 120 15s 1217 17 0.00000 14 158 - 0.00000 - 128 20s 1744 2 0.00000 8 167 - 0.00000 - 124 25s Cutting planes: Clique: 116 Zero half: 7 Explored 1817 nodes (257427 simplex iterations) in 25.66 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