current bounds on the number of colors: 0 -- 45 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 18:04:39 2012 Optimize a model with 11771 rows, 1523 columns and 36168 nonzeros Presolve time: 0.04s Presolved: 11771 rows, 1523 columns, 36168 nonzeros Variable types: 0 continuous, 1523 integer (1523 binary) Root relaxation: objective 0.000000e+00, 97 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 (386 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 -- 22 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 18:04:39 2012 Optimize a model with 5908 rows, 1028 columns and 18084 nonzeros Presolve time: 0.02s Presolved: 5908 rows, 1028 columns, 18084 nonzeros Variable types: 0 continuous, 1028 integer (1028 binary) Root relaxation: objective 0.000000e+00, 103 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 18 - 0.00000 - - 0s H 0 0 0.0000000 0.00000 0.0% - 0s Explored 0 nodes (1229 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 -- 11 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 18:04:39 2012 Optimize a model with 2710 rows, 758 columns and 8220 nonzeros Presolve time: 0.01s Presolved: 2710 rows, 758 columns, 8220 nonzeros Variable types: 0 continuous, 758 integer (758 binary) Root relaxation: objective 0.000000e+00, 91 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 80 - 0.00000 - - 0s 0 0 infeasible 0 - 0.10000 - - 0s Explored 0 nodes (1642 simplex iterations) in 0.18 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: 5 -- 11 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 18:04:39 2012 Optimize a model with 4309 rows, 893 columns and 13152 nonzeros Presolve time: 0.01s Presolved: 4309 rows, 893 columns, 13152 nonzeros Variable types: 0 continuous, 893 integer (893 binary) Root relaxation: objective 0.000000e+00, 92 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 44 - 0.00000 - - 0s 0 0 0.00000 0 30 - 0.00000 - - 0s 0 0 0.00000 0 151 - 0.00000 - - 0s 0 0 0.00000 0 205 - 0.00000 - - 0s 0 0 0.00000 0 177 - 0.00000 - - 1s 0 0 0.00000 0 175 - 0.00000 - - 1s 0 0 0.00000 0 136 - 0.00000 - - 2s 0 0 0.00000 0 181 - 0.00000 - - 2s 0 0 0.00000 0 194 - 0.00000 - - 2s 0 0 0.00000 0 143 - 0.00000 - - 3s 0 0 0.00000 0 199 - 0.00000 - - 3s 0 0 0.00000 0 161 - 0.00000 - - 4s 0 2 0.00000 0 161 - 0.00000 - - 4s 27 3 infeasible 8 - 0.00000 - 167 5s Cutting planes: Clique: 83 Zero half: 5 Explored 31 nodes (34098 simplex iterations) in 5.02 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 -- 11 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 18:04:44 2012 Optimize a model with 4842 rows, 938 columns and 14796 nonzeros Presolve time: 0.01s Presolved: 4842 rows, 938 columns, 14796 nonzeros Variable types: 0 continuous, 938 integer (938 binary) Root relaxation: objective 0.000000e+00, 103 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 30 - 0.00000 - - 0s 0 0 0.00000 0 28 - 0.00000 - - 0s 0 0 0.00000 0 80 - 0.00000 - - 0s 0 0 0.00000 0 153 - 0.00000 - - 0s 0 0 0.00000 0 84 - 0.00000 - - 1s 0 0 0.00000 0 16 - 0.00000 - - 1s 0 0 0.00000 0 30 - 0.00000 - - 1s 0 0 0.00000 0 117 - 0.00000 - - 1s 0 0 0.00000 0 71 - 0.00000 - - 1s 0 0 0.00000 0 66 - 0.00000 - - 2s 0 0 0.00000 0 60 - 0.00000 - - 2s 0 0 0.00000 0 72 - 0.00000 - - 2s 0 0 0.00000 0 125 - 0.00000 - - 2s 0 0 0.00000 0 125 - 0.00000 - - 3s 0 2 0.00000 0 125 - 0.00000 - - 3s 156 9 0.00000 12 107 - 0.00000 - 71.8 5s 1013 24 0.00000 0 90 - 0.00000 - 52.9 10s 1024 29 0.00000 18 151 - 0.00000 - 74.9 15s 1692 8 infeasible 31 - 0.00000 - 82.3 20s * 1803 0 36 0.0000000 0.00000 0.0% 82.2 20s Cutting planes: Clique: 25 Explored 1804 nodes (177460 simplex iterations) in 20.50 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: 9